{"transactions":[{"id":702366,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-29T00:47:18.000Z","date":"2026-07-27","kind":"sale","planned":false,"acquired":false,"shares":774177,"price":103.0525,"value":79780875.2925,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 208,695 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 260,572 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownershipof the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 208,695 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 260,572 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownershipof the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":473387,"source":{"system":"sec-edgar","filing":"0000904454-26-000425","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000425/ownership.xml","form_type":"4"}},{"id":702365,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-29T00:47:18.000Z","date":"2026-07-27","kind":"sale","planned":false,"acquired":false,"shares":466175,"price":103.0865,"value":48056349.1375,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 208,695 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 260,572 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownershipof the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 208,695 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 260,572 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownershipof the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1247564,"source":{"system":"sec-edgar","filing":"0000904454-26-000425","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000425/ownership.xml","form_type":"4"}},{"id":703084,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-27T21:11:36.000Z","date":"2026-07-24","kind":"sale","planned":false,"acquired":false,"shares":38835,"price":103.0776,"value":4003018.596,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 755,559 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 954,060 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 755,559 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 954,060 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1713739,"source":{"system":"sec-edgar","filing":"0000904454-26-000418","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000418/ownership.xml","form_type":"4"}},{"id":705919,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-20T23:05:54.000Z","date":"2026-07-17","kind":"sale","planned":false,"acquired":false,"shares":5159,"price":76.0315,"value":392246.5085,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 755,559 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 992,895 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 755,559 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 992,895 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1752574,"source":{"system":"sec-edgar","filing":"0000904454-26-000415","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000415/ownership.xml","form_type":"4"}},{"id":709956,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-15T01:56:07.000Z","date":"2026-07-13","kind":"sale","planned":false,"acquired":false,"shares":34272,"price":76.0368,"value":2605933.2096,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation(\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 757,680 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 995,933 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation(\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 757,680 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 995,933 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1757733,"source":{"system":"sec-edgar","filing":"0000904454-26-000405","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000405/ownership.xml","form_type":"4"}},{"id":711353,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-10T22:35:46.000Z","date":"2026-07-09","kind":"sale","planned":false,"acquired":false,"shares":2650,"price":76.511,"value":202754.15,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation(\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 771,766 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,016,119 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation(\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.(Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 771,766 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,016,119 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1792005,"source":{"system":"sec-edgar","filing":"0000904454-26-000403","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000403/ownership.xml","form_type":"4"}},{"id":831108,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-03-23T22:41:11.000Z","date":"2026-03-20","kind":"sale","planned":false,"acquired":false,"shares":14151,"price":71.122,"value":1006447.422,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 772,856 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 772,856 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1794655,"source":{"system":"sec-edgar","filing":"0000904454-26-000197","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000197/ownership.xml","form_type":"4"}},{"id":833796,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-03-19T21:37:26.000Z","date":"2026-03-17","kind":"sale","planned":false,"acquired":false,"shares":1199,"price":73.0603,"value":87599.2997,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 787,007 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 787,007 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1808806,"source":{"system":"sec-edgar","filing":"0000904454-26-000195","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000195/ownership.xml","form_type":"4"}},{"id":869236,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-03-03T21:35:12.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":11270,"price":76.49,"value":862042.3,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 788,206 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 788,206 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1810005,"source":{"system":"sec-edgar","filing":"0000904454-26-000146","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000146/ownership.xml","form_type":"4"}},{"id":869235,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-03-03T21:35:12.000Z","date":"2026-02-27","kind":"sale","planned":false,"acquired":false,"shares":235,"price":77.8214,"value":18288.029,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 788,206 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 788,206 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,017,679 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1821275,"source":{"system":"sec-edgar","filing":"0000904454-26-000146","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000146/ownership.xml","form_type":"4"}},{"id":877770,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-02-27T19:36:35.000Z","date":"2026-02-26","kind":"sale","planned":false,"acquired":false,"shares":6207,"price":77.8911,"value":483470.0577,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 796,478 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,020,912 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 796,478 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,020,912 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1821510,"source":{"system":"sec-edgar","filing":"0000904454-26-000132","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000132/ownership.xml","form_type":"4"}},{"id":877769,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-02-27T19:36:35.000Z","date":"2026-02-26","kind":"sale","planned":false,"acquired":false,"shares":5280,"price":78.9086,"value":416637.408,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 796,478 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,020,912 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 796,478 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,020,912 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1827537,"source":{"system":"sec-edgar","filing":"0000904454-26-000132","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000132/ownership.xml","form_type":"4"}},{"id":877768,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-02-27T19:36:35.000Z","date":"2026-02-25","kind":"sale","planned":false,"acquired":false,"shares":2147,"price":78.2902,"value":168089.0594,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 796,478 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,020,912 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 796,478 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,020,912 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1832817,"source":{"system":"sec-edgar","filing":"0000904454-26-000132","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000132/ownership.xml","form_type":"4"}},{"id":882358,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-02-25T21:34:39.000Z","date":"2026-02-24","kind":"sale","planned":false,"acquired":false,"shares":3231,"price":77.1371,"value":249229.9701,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 806,151 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,024,693 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 806,151 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,024,693 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1834964,"source":{"system":"sec-edgar","filing":"0000904454-26-000127","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000127/ownership.xml","form_type":"4"}},{"id":882357,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-02-25T21:34:39.000Z","date":"2026-02-23","kind":"sale","planned":false,"acquired":false,"shares":4089,"price":77.4788,"value":316810.8132,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 806,151 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,024,693 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 806,151 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,024,693 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1838195,"source":{"system":"sec-edgar","filing":"0000904454-26-000127","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445426000127/ownership.xml","form_type":"4"}},{"id":1825057,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-07-21T18:27:01.000Z","date":"2023-07-19","kind":"purchase","planned":false,"acquired":true,"shares":32384,"price":67.2432,"value":2177603.7888,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 801,213 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 801,213 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1842284,"source":{"system":"sec-edgar","filing":"0000904454-23-000438","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000438/ownership.xml","form_type":"4"}},{"id":1854718,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-15T20:33:30.000Z","date":"2023-06-14","kind":"purchase","planned":false,"acquired":true,"shares":14338,"price":73.787,"value":1057958.006,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 768,829 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 768,829 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1809900,"source":{"system":"sec-edgar","filing":"0000904454-23-000374","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000374/ownership.xml","form_type":"4"}},{"id":1862772,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-08T19:12:09.000Z","date":"2023-06-06","kind":"purchase","planned":false,"acquired":true,"shares":9820,"price":73.863,"value":725334.66,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 754,491 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 754,491 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1795562,"source":{"system":"sec-edgar","filing":"0000904454-23-000372","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000372/ownership.xml","form_type":"4"}},{"id":1865421,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-06T16:10:10.000Z","date":"2023-06-05","kind":"purchase","planned":false,"acquired":true,"shares":25400,"price":73.72,"value":1872488.0,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 744,671 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 744,671 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1785742,"source":{"system":"sec-edgar","filing":"0000904454-23-000368","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000368/ownership.xml","form_type":"4"}},{"id":1865420,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-06T16:10:10.000Z","date":"2023-06-02","kind":"purchase","planned":false,"acquired":true,"shares":1397,"price":73.98,"value":103350.06,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 744,671 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 744,671 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1760342,"source":{"system":"sec-edgar","filing":"0000904454-23-000368","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000368/ownership.xml","form_type":"4"}},{"id":1870431,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-02T18:36:19.000Z","date":"2023-06-01","kind":"purchase","planned":false,"acquired":true,"shares":6800,"price":72.777,"value":494883.6,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 717,874 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 717,874 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1758945,"source":{"system":"sec-edgar","filing":"0000904454-23-000366","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000366/ownership.xml","form_type":"4"}},{"id":1870430,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-02T18:36:19.000Z","date":"2023-05-31","kind":"purchase","planned":false,"acquired":true,"shares":19594,"price":73.862,"value":1447252.028,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 717,874 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 717,874 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1752145,"source":{"system":"sec-edgar","filing":"0000904454-23-000366","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000366/ownership.xml","form_type":"4"}},{"id":1870429,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-06-02T18:36:19.000Z","date":"2023-05-31","kind":"purchase","planned":false,"acquired":true,"shares":11201,"price":73.027,"value":817975.427,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 717,874 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 717,874 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1732551,"source":{"system":"sec-edgar","filing":"0000904454-23-000366","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000366/ownership.xml","form_type":"4"}},{"id":1873564,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-31T20:49:35.000Z","date":"2023-05-30","kind":"purchase","planned":false,"acquired":true,"shares":5419,"price":73.226,"value":396811.694,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 680,279 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 680,279 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1721350,"source":{"system":"sec-edgar","filing":"0000904454-23-000364","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000364/ownership.xml","form_type":"4"}},{"id":1873563,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-31T20:49:35.000Z","date":"2023-05-30","kind":"purchase","planned":false,"acquired":true,"shares":716,"price":72,"value":51552.0,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 680,279 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 680,279 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1715931,"source":{"system":"sec-edgar","filing":"0000904454-23-000364","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000364/ownership.xml","form_type":"4"}},{"id":1873562,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-31T20:49:35.000Z","date":"2023-05-26","kind":"purchase","planned":false,"acquired":true,"shares":1348,"price":71.866,"value":96875.368,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 680,279 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 680,279 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1715215,"source":{"system":"sec-edgar","filing":"0000904454-23-000364","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000364/ownership.xml","form_type":"4"}},{"id":1876850,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-26T15:16:50.000Z","date":"2023-05-25","kind":"purchase","planned":false,"acquired":true,"shares":3545,"price":71.871,"value":254782.695,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 672,796 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 672,796 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1713867,"source":{"system":"sec-edgar","filing":"0000904454-23-000360","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000360/ownership.xml","form_type":"4"}},{"id":1876849,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-26T15:16:50.000Z","date":"2023-05-24","kind":"purchase","planned":false,"acquired":true,"shares":26651,"price":72.335,"value":1927800.085,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 672,796 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 672,796 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1710322,"source":{"system":"sec-edgar","filing":"0000904454-23-000360","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000360/ownership.xml","form_type":"4"}},{"id":1879992,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-24T21:38:45.000Z","date":"2023-05-23","kind":"purchase","planned":false,"acquired":true,"shares":100,"price":73,"value":7300.0,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 642,600 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 642,600 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1683671,"source":{"system":"sec-edgar","filing":"0000904454-23-000358","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000358/ownership.xml","form_type":"4"}},{"id":1879991,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-05-24T21:38:45.000Z","date":"2023-05-22","kind":"purchase","planned":false,"acquired":true,"shares":8789,"price":72.796,"value":639804.044,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 642,600 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 14,320 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 642,600 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company, a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose."}],"balance_after":1683571,"source":{"system":"sec-edgar","filing":"0000904454-23-000358","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445423000358/ownership.xml","form_type":"4"}},{"id":2989947,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-06T22:46:09.000Z","date":"2020-11-04","kind":"purchase","acquired":true,"shares":650,"price":69.966,"value":45477.9,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 630,714 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 630,714 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1674782,"source":{"system":"sec-edgar","filing":"0000904454-20-000705","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000705/edgar.xml","form_type":"4"}},{"id":2995057,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-03T23:14:14.000Z","date":"2020-10-30","kind":"purchase","acquired":true,"shares":43378,"price":69.9136,"value":3032712.1408,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 630,064 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 630,064 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,026,751 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1674132,"source":{"system":"sec-edgar","filing":"0000904454-20-000695","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000695/edgar.xml","form_type":"4"}},{"id":2998201,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-10-30T01:33:36.000Z","date":"2020-10-29","kind":"purchase","acquired":true,"shares":14319,"price":69.9408,"value":1001482.3152,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 600,282 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,013,155 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 600,282 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,013,155 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1630754,"source":{"system":"sec-edgar","filing":"0000904454-20-000679","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000679/edgar.xml","form_type":"4"}},{"id":2998200,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-10-30T01:33:36.000Z","date":"2020-10-28","kind":"purchase","acquired":true,"shares":18594,"price":68.2511,"value":1269060.9534,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 600,282 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,013,155 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 600,282 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,013,155 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1616435,"source":{"system":"sec-edgar","filing":"0000904454-20-000679","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000679/edgar.xml","form_type":"4"}},{"id":2998199,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-10-30T01:33:36.000Z","date":"2020-10-27","kind":"purchase","acquired":true,"shares":15646,"price":68.9688,"value":1079085.8448,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 600,282 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,013,155 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 600,282 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 1,013,155 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1597841,"source":{"system":"sec-edgar","filing":"0000904454-20-000679","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000679/edgar.xml","form_type":"4"}},{"id":3001673,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-10-22T23:53:40.000Z","date":"2020-10-20","kind":"purchase","acquired":true,"shares":100,"price":68,"value":6800.0,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 566,940 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 566,940 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation (\"PRHAC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1582195,"source":{"system":"sec-edgar","filing":"0000904454-20-000665","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000665/edgar.xml","form_type":"4"}},{"id":3196638,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-03-24T23:44:21.000Z","date":"2020-03-23","kind":"purchase","acquired":true,"shares":862,"price":66.82,"value":57598.84,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 566,840 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Security Insurance Company, a Massachusetts corporation (\"BHSIC\"). PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 566,840 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Security Insurance Company, a Massachusetts corporation (\"BHSIC\"). PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1582095,"source":{"system":"sec-edgar","filing":"0000904454-20-000308","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000308/edgar.xml","form_type":"4"}},{"id":3198123,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-03-23T16:07:30.000Z","date":"2020-03-20","kind":"purchase","acquired":true,"shares":17590,"price":71.32,"value":1254518.8,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 565,978 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"and Bunker Hill Security Insurance Company, a Massachusetts corporation (\"BHSIC\"). PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 565,978 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"and Bunker Hill Security Insurance Company, a Massachusetts corporation (\"BHSIC\"). PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC. Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\"); High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (Continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purposes."}],"balance_after":1581233,"source":{"system":"sec-edgar","filing":"0000904454-20-000304","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000304/edgar.xml","form_type":"4"}},{"id":3200916,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":28326,"kind":"organization","name":"SRB CORP","position":1,"cik":"0001496228","reported_name":"SRB Corp","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":28327,"kind":"organization","name":"Plymouth Rock Co Inc","position":2,"cik":"0001556246","reported_name":"Plymouth Rock Co Inc","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-03-20T01:47:13.000Z","date":"2020-03-18","kind":"purchase","acquired":true,"shares":17110,"price":73.75,"value":1261862.5,"ownership":{"direct":false,"nature":"See"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4.  The following subsidiaries of PRC hold in the aggregate 548,388 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); and Bunker Hill Security Insurance Company, a Massachusetts corporation (\"BHSIC\"). (Continued in Footnote 4)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC.  Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC.  PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\");  High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (continued in Footnote 5)"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such  shares for purposes of Section 16 or for any other purposes."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation (\"SRB\"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation (\"PRC\"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Persons are making this single joint filing because they may be deemed a \"group\" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"PRC holds 17,317 of the shares of Common Stock reported on this Form 4.  The following subsidiaries of PRC hold in the aggregate 548,388 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation (\"PRSC\"); Plymouth Rock Assurance Corporation, a Massachusetts corporation (\"PRAC\"); Plymouth Rock Assurance Preferred Corporation, a New York corporation (\"PRAPC\"); Plymouth Rock Assurance Corporation of New York, a New York corporation (\"PRACNY\"); Pilgrim Insurance Company, a Massachusetts corporation; (\"Pilgrim\"); Bunker Hill Insurance Company, a Massachusetts corporation (\"BHIC\"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation (\"BHICC\"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation (\"BHPREFIC\"); Bunker Hill Property Insurance Company, a Massachusetts corporation (\"BHPIC\"); and Bunker Hill Security Insurance Company, a Massachusetts corporation (\"BHSIC\"). (Continued in Footnote 4)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC.  Palisades Safety and Assurance Association, a New Jersey reciprocal insurance exchange (\"PSIA\") , is managed by a subsidiary of PRC.  PSIA and the following subsidiaries of PSIA hold in the aggregate 997,938 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation (\"HPSIC\"); High Point Property and Casualty Insurance Company, a New Jersey corporation (\"HPPCIC\");  High Point Preferred Insurance Company, a New Jersey corporation (\"HPPIC\"); Palisades Insurance Company, a New Jersey corporation (\"PICNJ\"); (continued in Footnote 5)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Twin Lights Insurance Company , a New Jersey corporation (\"TLIC\"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation (\"TAIC\"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such  shares for purposes of Section 16 or for any other purposes."}],"balance_after":1563643,"source":{"system":"sec-edgar","filing":"0000904454-20-000298","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000090445420000298/edgar.xml","form_type":"4"}}]}