{"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":869295,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-03-02","kind":"tax_withholding","planned":true,"acquired":false,"shares":176,"price":76.89,"value":13532.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $76.53 to $77.17 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":9101,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869294,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-03-02","kind":"tax_withholding","planned":true,"acquired":false,"shares":17,"price":76.18,"value":1295.06,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $75.50 to $76.22 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":9277,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869293,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-27","kind":"tax_withholding","planned":true,"acquired":false,"shares":142,"price":77.49,"value":11003.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $77.20 to $77.73 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":9294,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869292,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-27","kind":"tax_withholding","planned":true,"acquired":false,"shares":70,"price":76.78,"value":5374.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $76.10 to $77.09 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":9436,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869291,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-24","kind":"tax_withholding","planned":true,"acquired":false,"shares":8,"price":77.42,"value":619.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $77.32 to $77.54 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":9506,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869290,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-24","kind":"tax_withholding","planned":true,"acquired":false,"shares":38,"price":76.95,"value":2924.1,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $76.28 to $77.23 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":9514,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869289,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-25","kind":"grant","planned":true,"acquired":true,"shares":1982,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents restricted stock awards granted effective February 25, 2026 with respect to which sale or transfer rights will vest over a three-year performance period commencing on January 1, 2026 and ending on December 31, 2028. Vesting of these shares is dependent upon the attainment of pre-established performance objectives, and any difference between shares granted and shares earned at the end of the performance period will be reported at the conclusion of the performance period in 2029."}],"balance_after":9552,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869288,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-25","kind":"grant","planned":true,"acquired":true,"shares":1721,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents restricted stock awards effective February 25, 2026, with respect to which sale or transfer rights shall vest over three years with installments of 30% on February 25, 2027, 30% on February 25, 2028, and the remaining 40% on February 25, 2029, provided the grantee meets certain employment conditions."}],"balance_after":7570,"source":{"system":"sec-edgar","filing":"0002017175-26-000001","document":"form4-03032026_100308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000201717526000001/form4-03032026_100308.xml","form_type":"4"}},{"id":869287,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2026-03-03T22:48:11.000Z","date":"2026-02-25","kind":"other","planned":true,"acquired":false,"shares":249,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the difference between performance shares, with a three year performance period, that were granted on February 22, 2023 and actual shares earned at the end of the performance period on December 31, 2025. 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Vesting of these shares is dependent upon the attainment of pre-established performance objectives, and any difference between shares granted and shares earned at the end of the performance period will be reported at the conclusion of the performance period in 2029."}],"balance_after":9904,"source":{"system":"sec-edgar","filing":"0002028572-26-000001","document":"form4-03032026_100303.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000202857226000001/form4-03032026_100303.xml","form_type":"4"}},{"id":869238,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63465,"kind":"person","name":"McConnell Mary Frances","position":1,"cik":"0002028572","reported_name":"McConnell Mary Frances","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Underwriting"}}],"security":"Common Stock","published_at":"2026-03-03T22:40:07.000Z","date":"2026-02-25","kind":"grant","planned":true,"acquired":true,"shares":1721,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents restricted stock awards effective February 25, 2026, with respect to which sale or transfer rights shall vest over three years with installments of 30% on February 25, 2027, 30% on February 25, 2028, and the remaining 40% on February 25, 2029, provided the grantee meets certain employment conditions."}],"balance_after":7922,"source":{"system":"sec-edgar","filing":"0002028572-26-000001","document":"form4-03032026_100303.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000202857226000001/form4-03032026_100303.xml","form_type":"4"}},{"id":869237,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63465,"kind":"person","name":"McConnell Mary Frances","position":1,"cik":"0002028572","reported_name":"McConnell Mary Frances","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Underwriting"}}],"security":"Common Stock","published_at":"2026-03-03T22:40:07.000Z","date":"2026-02-25","kind":"other","planned":true,"acquired":false,"shares":275,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the difference between performance shares, with a three year performance period, that were granted on February 22, 2023 and actual shares earned at the end of the performance period on December 31, 2025. Final shares were approved by the Compensation Committee on February 25, 2026."}],"balance_after":6201,"source":{"system":"sec-edgar","filing":"0002028572-26-000001","document":"form4-03032026_100303.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000202857226000001/form4-03032026_100303.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":871519,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-03-02","kind":"tax_withholding","planned":true,"acquired":false,"shares":185,"price":76.89,"value":14224.65,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"shares","element":"transactionShares","label":"F5","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $76.53 to $77.17 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":14963,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871518,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-03-02","kind":"tax_withholding","planned":true,"acquired":false,"shares":18,"price":76.18,"value":1371.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"shares","element":"transactionShares","label":"F5","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $75.50 to $76.22 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":15148,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871517,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-27","kind":"tax_withholding","planned":true,"acquired":false,"shares":146,"price":77.49,"value":11313.54,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"shares","element":"transactionShares","label":"F5","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $77.20 to $77.73 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":15166,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871516,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-27","kind":"tax_withholding","planned":true,"acquired":false,"shares":72,"price":76.79,"value":5528.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"shares","element":"transactionShares","label":"F5","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $76.10 to $77.09 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":15312,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871515,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-24","kind":"tax_withholding","planned":true,"acquired":false,"shares":39,"price":77.43,"value":3019.77,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"shares","element":"transactionShares","label":"F5","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $77.32 to $77.59 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":15384,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871514,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-24","kind":"tax_withholding","planned":true,"acquired":false,"shares":183,"price":76.94,"value":14080.02,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"shares","element":"transactionShares","label":"F5","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 25, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $76.28 to $77.23 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":15423,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871513,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-25","kind":"grant","planned":true,"acquired":true,"shares":2147,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents restricted stock awards granted effective February 25, 2026 with respect to which sale or transfer rights will vest over a three-year performance period commencing on January 1, 2026 and ending on December 31, 2028. Vesting of these shares is dependent upon the attainment of pre-established performance objectives, and any difference between shares granted and shares earned at the end of the performance period will be reported at the conclusion of the performance period in 2029."}],"balance_after":15606,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871512,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-25","kind":"grant","planned":true,"acquired":true,"shares":1864,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents restricted stock awards effective February 25, 2026, with respect to which sale or transfer rights shall vest over three years with installments of 30% on February 25, 2027, 30% on February 25, 2028, and the remaining 40% on February 25, 2029, provided the grantee meets certain employment conditions."}],"balance_after":13459,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":871511,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63699,"kind":"person","name":"Hiltpold Glenn","position":1,"cik":"0001850287","reported_name":"Hiltpold Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP OF ACTUARIAL SERVICES"}}],"security":"Common Stock","published_at":"2026-03-03T17:41:32.000Z","date":"2026-02-25","kind":"other","planned":true,"acquired":false,"shares":1513,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the difference between performance shares, with a three year performance period, that were granted on February 22, 2023 and actual shares earned at the end of the performance period on December 31, 2025. Final shares were approved by the Compensation Committee on February 25, 2026."}],"balance_after":11595,"source":{"system":"sec-edgar","filing":"0001850287-26-000001","document":"form4-03032026_100329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1850287/000185028726000001/form4-03032026_100329.xml","form_type":"4"}},{"id":874896,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":62243,"kind":"person","name":"Langwell Dennis J.","position":1,"cik":"0001501635","reported_name":"Langwell Dennis J.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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Charles Joseph III","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-03-02T14:56:47.000Z","date":"2026-02-25","kind":"grant","planned":false,"acquired":true,"shares":1083,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents restricted stock award effective February 25, 2026"}],"balance_after":12083,"source":{"system":"sec-edgar","filing":"0001992556-26-000002","document":"form4-03022026_020344.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000199255626000002/form4-03022026_020344.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":959946,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63466,"kind":"person","name":"Murphy George","position":1,"cik":"0001340675","reported_name":"Murphy George","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common 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Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":6098,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}},{"id":1230474,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2025-03-04T18:40:36.000Z","date":"2025-02-28","kind":"tax_withholding","planned":true,"acquired":false,"shares":99,"price":75.5,"value":7474.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $75.40 to $75.64 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":6191,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}},{"id":1230473,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2025-03-04T18:40:36.000Z","date":"2025-02-27","kind":"tax_withholding","planned":true,"acquired":false,"shares":49,"price":75.92,"value":3720.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $75.43 to $76.20 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":6290,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}},{"id":1230472,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2025-03-04T18:40:36.000Z","date":"2025-02-25","kind":"tax_withholding","planned":true,"acquired":false,"shares":72,"price":79.52,"value":5725.44,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $79.15 to $79.95 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":6339,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}},{"id":1230471,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2025-03-04T18:40:36.000Z","date":"2025-02-25","kind":"tax_withholding","planned":true,"acquired":false,"shares":8,"price":78.51,"value":628.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"Represents the weighted average sale price of multiple open market same day sales with prices ranging from $78.40 to $78.72 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission or a security holder of the issuer upon request."}],"balance_after":6411,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}},{"id":1230470,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2025-03-04T18:40:36.000Z","date":"2025-02-25","kind":"tax_withholding","planned":true,"acquired":false,"shares":1,"price":77.48,"value":77.48,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Securities sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024."},{"field":"shares","element":"transactionShares","label":"F5","text":"Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3."}],"balance_after":6419,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}},{"id":1230469,"issuer":{"id":4681,"kind":"organization","name":"SAFETY INSURANCE GROUP INC"},"owners":[{"id":63471,"kind":"person","name":"Lam Brian Siu-Gae","position":1,"cik":"0002017175","reported_name":"Lam Brian Siu-Gae","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP of Insurance Operations"}}],"security":"Common Stock","published_at":"2025-03-04T18:40:36.000Z","date":"2025-02-25","kind":"grant","planned":true,"acquired":true,"shares":1656,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents restricted stock awards granted effective February 25, 2025 with respect to which sale or transfer rights will vest over a three-year performance period commencing on January 1, 2025 and ending on December 31, 2027. Vesting of these shares is dependent upon the attainment of pre-established performance objectives, and any difference between shares granted and shares earned at the end of the performance period will be reported at the conclusion of the performance period in 2028."}],"balance_after":6420,"source":{"system":"sec-edgar","filing":"0001415889-25-006435","document":"form4-03042025_060332.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1172052/000141588925006435/form4-03042025_060332.xml","form_type":"4"}}],"next_cursor":"2025-03-04T18:40:36.000000Z,1230469"}