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Any such additional shares (once determined) will be reported on a subsequent Form 4."}],"balance_after":81796.57,"source":{"system":"sec-edgar","filing":"0001179110-20-007103","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020007103/edgar.xml","form_type":"4"}},{"id":3118084,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127972,"kind":"person","name":"Hough Thomas A.","position":1,"cik":"0001679762","reported_name":"Hough Thomas A.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Subscription Rights","published_at":"2020-06-08T22:10:21.000Z","date":"2020-06-05","kind":"exercise","acquired":false,"shares":15699,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":10.22,"exercise_date":"2020-05-13","expiration_date":"2020-06-05","underlying":"Common Stock","underlying_shares":3924},"source":{"system":"sec-edgar","filing":"0001179110-20-007102","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020007102/edgar.xml","form_type":"4"}},{"id":3118083,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127972,"kind":"person","name":"Hough Thomas A.","position":1,"cik":"0001679762","reported_name":"Hough Thomas A.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-06-08T22:10:21.000Z","date":"2020-06-05","kind":"exercise","acquired":true,"shares":3924,"price":10.22,"value":40103.28,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 5, 2020, the reporting person exercised in full his primary subscription rights (every 4 subscription rights entitling him to purchase 1 share of Common Stock), which were issued to holders of Common Stock on the May 13, 2020 record date for the rights offering."},{"field":"shares","element":"transactionShares","label":"F2","text":"Pursuant to the rights offering, the reporting person has also exercised his over-subscription privilege and may acquire additional shares of Common Stock pursuant thereto. Any such additional shares (once determined) will be reported on a subsequent Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Prior to the transaction, the reporting person held 15,699.19 shares of Common Stock. The Form 4 filed by the reporting person on March 2, 2020 erroneously reflected that the reporting person held 16,590.19 shares of Common Stock."}],"balance_after":19623.19,"source":{"system":"sec-edgar","filing":"0001179110-20-007102","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020007102/edgar.xml","form_type":"4"}},{"id":3118614,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":34551,"kind":"person","name":"Richer Clare Stack","position":1,"cik":"0001451084","reported_name":"Richer Clare Stack","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Subscription Rights","published_at":"2020-06-08T20:43:26.000Z","date":"2020-06-05","kind":"exercise","acquired":true,"shares":5417,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":10.22,"exercise_date":"2020-05-13","expiration_date":"2020-06-05","underlying":"Common Stock","underlying_shares":1354},"source":{"system":"sec-edgar","filing":"0001179110-20-007091","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1451084/000117911020007091/edgar.xml","form_type":"4"}},{"id":3118613,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":34551,"kind":"person","name":"Richer Clare Stack","position":1,"cik":"0001451084","reported_name":"Richer Clare Stack","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-06-08T20:43:26.000Z","date":"2020-06-05","kind":"exercise","acquired":true,"shares":1354,"price":10.22,"value":13837.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 5, 2020, the reporting person exercised in full her primary subscription rights (every 4 subscription rights entitling him to purchase 1 share of Common Stock), which were issued to holders of Common Stock on the May 13, 2020 record date for the rights offering."},{"field":"shares","element":"transactionShares","label":"F2","text":"Pursuant to the rights offering, the reporting person has also exercised her over-subscription privilege and may acquire additional shares of Common Stock pursuant thereto. Any such additional shares (once determined) will be reported on a subsequent Form 4."}],"balance_after":6771,"source":{"system":"sec-edgar","filing":"0001179110-20-007091","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1451084/000117911020007091/edgar.xml","form_type":"4"}},{"id":3118890,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127973,"kind":"person","name":"Boyle Michael John","position":1,"cik":"0001731549","reported_name":"Boyle Michael John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Vice President and Treasurer"}}],"security":"Subscription Rights","published_at":"2020-06-08T19:40:18.000Z","date":"2020-06-05","kind":"exercise","acquired":false,"shares":19201,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":10.22,"exercise_date":"2020-05-13","expiration_date":"2020-06-05","underlying":"Common Stock","underlying_shares":4799},"source":{"system":"sec-edgar","filing":"0001179110-20-007113","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1731549/000117911020007113/edgar.xml","form_type":"4"}},{"id":3118889,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127973,"kind":"person","name":"Boyle Michael John","position":1,"cik":"0001731549","reported_name":"Boyle Michael John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Vice President and Treasurer"}}],"security":"Common Stock","published_at":"2020-06-08T19:40:18.000Z","date":"2020-06-05","kind":"exercise","acquired":true,"shares":4799,"price":10.22,"value":49045.78,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 5, 2020, the reporting person exercised in full his primary subscription rights (every 4 subscription rights entitling him to purchase 1 share of Common Stock), which were issued to holders of Common Stock on the May 13, 2020 record date for the rights offering."},{"field":"shares","element":"transactionShares","label":"F2","text":"Pursuant to the rights offering, the reporting person has also exercised his over-subscription privilege and may acquire additional shares of Common Stock pursuant thereto. Any such additional shares (once determined) will be reported on a subsequent Form 4."}],"balance_after":24542.99,"source":{"system":"sec-edgar","filing":"0001179110-20-007113","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1731549/000117911020007113/edgar.xml","form_type":"4"}},{"id":3118715,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75268,"kind":"organization","name":"BAIN CAPITAL CREDIT MEMBER, LLC","position":1,"cik":"0001309111","reported_name":"BAIN CAPITAL CREDIT MEMBER, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":112720,"kind":"organization","name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","position":2,"cik":"0001651587","reported_name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Subscription Rights","published_at":"2020-06-08T18:28:13.000Z","date":"2020-06-05","kind":"other","acquired":false,"shares":8696252,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Following the transactions described herein, shares of Common Stock are directly held by the following entities: (a) 9,116,331.48 by F Holdings, whose general partner is Bain Capital Distressed and Special Situations 2016 Investors (F), L.P. (\"F Holdings GP\"), and (b) 1,753,983,19 by MRF Holdings and together with F Holdings, the \"Funds\"), whose general partner is Bain Capital Credit Holdings Investors (MRF), LP (\"MRF Holdings GP\").  Bain Capital Credit Member, LLC (\"BCCM\") is the general partner of F Holdings GP and MRF Holdings GP."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"BCCM may be deemed to share beneficial ownership of all 10,870,314.67 shares of Common Stock held of record by the Funds, but disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein."}],"balance_after":0,"derivative":{"exercise_price":10.22,"exercise_date":"2020-05-13","expiration_date":"2020-06-05","underlying":"Common Stock","underlying_shares":2174062},"source":{"system":"sec-edgar","filing":"0001179110-20-007104","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1651587/000117911020007104/edgar.xml","form_type":"4"}},{"id":3118714,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75268,"kind":"organization","name":"BAIN CAPITAL CREDIT MEMBER, LLC","position":1,"cik":"0001309111","reported_name":"BAIN CAPITAL CREDIT MEMBER, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":112720,"kind":"organization","name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","position":2,"cik":"0001651587","reported_name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-06-08T18:28:13.000Z","date":"2020-06-05","kind":"other","acquired":true,"shares":2174062,"price":10.22,"value":22218913.64,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 5, 2020, Bain Capital Distressed and Special Situations 2016 (F), L.P. (\"F Holdings\") and Bain Capital Credit Holdings (MRF), L.P. (\"MRF Holdings\") each exercised in full its primary subscription rights (every 4 subscription rights entitling it to purchase 1 share of Common Stock), which were issued to holders of Common Stock on the May 13, 2020 record date for the rights offering."},{"field":"shares","element":"transactionShares","label":"F2","text":"Pursuant to the rights offering, each of F Holdings and MRF Holdings has also exercised its over-subscription privilege and may acquire additional shares of Common Stock pursuant thereto. Any such additional shares (once determined) will be reported on a subsequent Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Following the transactions described herein, shares of Common Stock are directly held by the following entities: (a) 9,116,331.48 by F Holdings, whose general partner is Bain Capital Distressed and Special Situations 2016 Investors (F), L.P. (\"F Holdings GP\"), and (b) 1,753,983,19 by MRF Holdings and together with F Holdings, the \"Funds\"), whose general partner is Bain Capital Credit Holdings Investors (MRF), LP (\"MRF Holdings GP\").  Bain Capital Credit Member, LLC (\"BCCM\") is the general partner of F Holdings GP and MRF Holdings GP."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"BCCM may be deemed to share beneficial ownership of all 10,870,314.67 shares of Common Stock held of record by the Funds, but disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein."}],"balance_after":10870314.67,"source":{"system":"sec-edgar","filing":"0001179110-20-007104","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1651587/000117911020007104/edgar.xml","form_type":"4"}},{"id":3118360,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127971,"kind":"person","name":"MARGOLIS JAY","position":1,"cik":"0001194821","reported_name":"MARGOLIS JAY","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Subscription Rights","published_at":"2020-06-08T17:55:30.000Z","date":"2020-06-05","kind":"exercise","acquired":false,"shares":23085,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":10.22,"exercise_date":"2020-05-13","expiration_date":"2020-06-05","underlying":"Common Stock","underlying_shares":5771},"source":{"system":"sec-edgar","filing":"0001179110-20-007101","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1194821/000117911020007101/edgar.xml","form_type":"4"}},{"id":3118359,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127971,"kind":"person","name":"MARGOLIS JAY","position":1,"cik":"0001194821","reported_name":"MARGOLIS JAY","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-06-08T17:55:30.000Z","date":"2020-06-05","kind":"exercise","acquired":true,"shares":5771,"price":10.22,"value":58979.62,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 5, 2020, the reporting person exercised in full his primary subscription rights (every 4 subscription rights entitling him to purchase 1 share of Common Stock), which were issued to holders of Common Stock on the May 13, 2020 record date for the rights offering."}],"balance_after":28856.49,"source":{"system":"sec-edgar","filing":"0001179110-20-007101","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1194821/000117911020007101/edgar.xml","form_type":"4"}},{"id":3210356,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127977,"kind":"person","name":"Hawkins Jeffrey B.","position":1,"cik":"0001679754","reported_name":"Hawkins Jeffrey B.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-03-13T13:03:51.000Z","date":"2020-03-12","kind":"purchase","acquired":true,"shares":16650,"price":14.91,"value":248251.5,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These shares were acquired in multiple transactions at prices ranging from $14.33 to $15.00, inclusive.  The purchase price reported above reflects the weighted average purchase price.  The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":65437.57,"source":{"system":"sec-edgar","filing":"0001179110-20-003615","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020003615/edgar.xml","form_type":"4"}},{"id":3214957,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75594,"kind":"person","name":"Ewald Michael A","position":1,"cik":"0001678730","reported_name":"Ewald Michael A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-03-11T20:38:14.000Z","date":"2020-03-11","kind":"purchase","acquired":true,"shares":6000,"price":16.69,"value":100140.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"These shares were acquired in multiple transactions at prices ranging from $16.65 to $16.70, inclusive.  The purchase price reported above reflects the weighted average purchase price.  The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":53769.23,"source":{"system":"sec-edgar","filing":"0001179110-20-003479","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020003479/edgar.xml","form_type":"4"}},{"id":3214956,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75594,"kind":"person","name":"Ewald Michael A","position":1,"cik":"0001678730","reported_name":"Ewald Michael A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-03-11T20:38:14.000Z","date":"2020-03-11","kind":"purchase","acquired":true,"shares":3000,"price":16.69,"value":50070.0,"ownership":{"direct":false,"nature":"By The Michael A. Ewald 2010 Irrevocable Family Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These shares were acquired in multiple transactions at prices ranging from $16.65 to $16.70, inclusive.  The purchase price reported above reflects the weighted average purchase price.  The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":37655,"source":{"system":"sec-edgar","filing":"0001179110-20-003479","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020003479/edgar.xml","form_type":"4"}},{"id":3217041,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127977,"kind":"person","name":"Hawkins Jeffrey B.","position":1,"cik":"0001679754","reported_name":"Hawkins Jeffrey B.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-03-10T20:35:53.000Z","date":"2020-03-10","kind":"purchase","acquired":true,"shares":14500,"price":17.16,"value":248820.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These shares were acquired in multiple transactions at prices ranging from $17.02 to $17.29, inclusive.  The purchase price reported above reflects the weighted average purchase price.  The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":48787.57,"source":{"system":"sec-edgar","filing":"0001179110-20-003401","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020003401/edgar.xml","form_type":"4"}},{"id":3217038,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75594,"kind":"person","name":"Ewald Michael A","position":1,"cik":"0001678730","reported_name":"Ewald Michael A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-03-10T20:30:54.000Z","date":"2020-03-10","kind":"purchase","acquired":true,"shares":12000,"price":17.12,"value":205440.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"These shares were acquired in multiple transactions at prices ranging from $17.04 to $17.26, inclusive.  The purchase price reported above reflects the weighted average purchase price.  The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":47769.23,"source":{"system":"sec-edgar","filing":"0001179110-20-003400","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020003400/edgar.xml","form_type":"4"}},{"id":3217037,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75594,"kind":"person","name":"Ewald Michael A","position":1,"cik":"0001678730","reported_name":"Ewald Michael A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-03-10T20:30:54.000Z","date":"2020-03-10","kind":"purchase","acquired":true,"shares":6000,"price":17.14,"value":102840.0,"ownership":{"direct":false,"nature":"By The Michael A. 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The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":34655,"source":{"system":"sec-edgar","filing":"0001179110-20-003400","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911020003400/edgar.xml","form_type":"4"}},{"id":3231468,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127971,"kind":"person","name":"MARGOLIS JAY","position":1,"cik":"0001194821","reported_name":"MARGOLIS JAY","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":27483,"source":{"system":"sec-edgar","filing":"0001179110-19-009778","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911019009778/edgar.xml","form_type":"4"}},{"id":3430767,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75594,"kind":"person","name":"Ewald Michael A","position":1,"cik":"0001678730","reported_name":"Ewald Michael A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-08-22T20:09:38.000Z","date":"2019-08-21","kind":"purchase","acquired":true,"shares":14608,"price":18.11,"value":264550.88,"ownership":{"direct":false,"nature":"By The Michael A. 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The reporting person hereby undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":14608,"source":{"system":"sec-edgar","filing":"0001179110-19-009778","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1655050/000117911019009778/edgar.xml","form_type":"4"}},{"id":3456671,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75268,"kind":"organization","name":"BAIN CAPITAL CREDIT MEMBER, LLC","position":1,"cik":"0001309111","reported_name":"BAIN CAPITAL CREDIT MEMBER, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":112720,"kind":"organization","name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","position":2,"cik":"0001651587","reported_name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-07-24T17:06:56.000Z","date":"2019-07-23","kind":"other","acquired":false,"shares":1731234.83,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Distribution on July 23, 2019 of 1,731,234.83 shares of the Issuer's common stock (\"Common Stock\") by BCSF Holdings, LP (\"BCSF Holdings\"), for no consideration, to one of its limited partners."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"As of July 24, 2019, shares of Common Stock are directly held by the following entities: (a) 7,293,065.48 by Bain Capital Distressed and Special Situations 2016 (F), L.P. (\"F Holdings\"), whose general partner is Bain Capital Distressed and Special Situations 2016 Investors (F), L.P. (\"F Holdings GP\"), and (b) 1,403,187.19 by Bain Capital Credit Holdings (MRF), L.P. (\"MRF Holdings\" and together with BCSF Holdings and F Holdings, the \"Funds\"), whose general partner is Bain Capital Credit Holdings Investors (MRF), LP (\"MRF Holdings GP\").  As of July 23, 2019, BCSF Holdings, whose general partner is BCSF Holdings Investors, L.P. (\"BCSF Holdings GP\"), ceased to be the record owner of any shares of the Issuer's Common Stock.  Bain Capital Credit Member, LLC (\"BCCM\") is the general partner of BCSF Holdings GP, F Holdings GP and MRF Holdings GP."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of July 24, 2019, BCCM may be deemed to share beneficial ownership of all 8,696,252.67 shares of Common Stock held of record by the Funds, but disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein."}],"balance_after":8696252.67,"source":{"system":"sec-edgar","filing":"0001567619-19-015135","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1651587/000156761919015135/doc1.xml","form_type":"4"}},{"id":3523951,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75268,"kind":"organization","name":"BAIN CAPITAL CREDIT MEMBER, LLC","position":1,"cik":"0001309111","reported_name":"BAIN CAPITAL CREDIT MEMBER, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"See Footnote (1)"}},{"id":112720,"kind":"organization","name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","position":2,"cik":"0001651587","reported_name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":157510,"kind":"organization","name":"BCSF Holdings, L.P.","position":3,"cik":"0001683647","reported_name":"BCSF Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Footnote (1)"}}],"security":"Common Stock","published_at":"2019-05-16T16:41:36.000Z","date":"2019-05-16","kind":"other","acquired":false,"shares":182818.4,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Distributions on May 14, May 15, and May 16, 2019 of 6,544,098.85, 2,176,110.71, and 182,818.40 shares of the Issuer's common stock (\"Common Stock\"), respectively, by BCSF Holdings, LP (\"BCSF Holdings\"), in all instances for no consideration, to certain of its limited partners.  As of May 14, 2019, BCSF Holdings ceased to be the record owner of more than 10% of the Issuer's Common Stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"As of May 16, 2019, shares of Common Stock are directly held by the following entities: (a) 1,713,234.83 by BCSF Holdings, whose general partner is BCSF Holdings Investors, L.P. (\"BCSF Holdings GP\"), (b) 7,293,065.48 by Bain Capital Distressed and Special Situations 2016 (F), L.P. (\"F Holdings\"), whose general partner is Bain Capital Distressed and Special Situations 2016 Investors (F), L.P. (\"F Holdings GP\"), and (c) 1,403,187.19 by Bain Capital Credit Holdings (MRF), L.P. (\"MRF Holdings\" and together with BCSF Holdings and F Holdings, the \"Funds\"), whose general partner is Bain Capital Credit Holdings Investors (MRF), LP (\"MRF Holdings GP\").  Bain Capital Credit Member, LLC (\"BCCM\") is the general partner of BCSF Holdings GP, F Holdings GP and MRF Holdings GP."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of May 16, 2019, BCCM may be deemed to share beneficial ownership of all 10,427,487.50 shares of Common Stock held of record by the Funds, but disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein."}],"balance_after":10427487.5,"source":{"system":"sec-edgar","filing":"0001567619-19-011434","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1683647/000156761919011434/doc1.xml","form_type":"4"}},{"id":3523950,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75268,"kind":"organization","name":"BAIN CAPITAL CREDIT MEMBER, LLC","position":1,"cik":"0001309111","reported_name":"BAIN CAPITAL CREDIT MEMBER, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"See Footnote (1)"}},{"id":112720,"kind":"organization","name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","position":2,"cik":"0001651587","reported_name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":157510,"kind":"organization","name":"BCSF Holdings, L.P.","position":3,"cik":"0001683647","reported_name":"BCSF Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Footnote (1)"}}],"security":"Common Stock","published_at":"2019-05-16T16:41:36.000Z","date":"2019-05-15","kind":"other","acquired":false,"shares":2176110.71,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Distributions on May 14, May 15, and May 16, 2019 of 6,544,098.85, 2,176,110.71, and 182,818.40 shares of the Issuer's common stock (\"Common Stock\"), respectively, by BCSF Holdings, LP (\"BCSF Holdings\"), in all instances for no consideration, to certain of its limited partners.  As of May 14, 2019, BCSF Holdings ceased to be the record owner of more than 10% of the Issuer's Common Stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"As of May 16, 2019, shares of Common Stock are directly held by the following entities: (a) 1,713,234.83 by BCSF Holdings, whose general partner is BCSF Holdings Investors, L.P. (\"BCSF Holdings GP\"), (b) 7,293,065.48 by Bain Capital Distressed and Special Situations 2016 (F), L.P. (\"F Holdings\"), whose general partner is Bain Capital Distressed and Special Situations 2016 Investors (F), L.P. (\"F Holdings GP\"), and (c) 1,403,187.19 by Bain Capital Credit Holdings (MRF), L.P. (\"MRF Holdings\" and together with BCSF Holdings and F Holdings, the \"Funds\"), whose general partner is Bain Capital Credit Holdings Investors (MRF), LP (\"MRF Holdings GP\").  Bain Capital Credit Member, LLC (\"BCCM\") is the general partner of BCSF Holdings GP, F Holdings GP and MRF Holdings GP."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of May 16, 2019, BCCM may be deemed to share beneficial ownership of all 10,427,487.50 shares of Common Stock held of record by the Funds, but disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein."}],"balance_after":10610305.9,"source":{"system":"sec-edgar","filing":"0001567619-19-011434","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1683647/000156761919011434/doc1.xml","form_type":"4"}},{"id":3523949,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":75268,"kind":"organization","name":"BAIN CAPITAL CREDIT MEMBER, LLC","position":1,"cik":"0001309111","reported_name":"BAIN CAPITAL CREDIT MEMBER, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":true,"other_text":"See Footnote (1)"}},{"id":112720,"kind":"organization","name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","position":2,"cik":"0001651587","reported_name":"Bain Capital Distressed & Special Situations 2016 (F), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":157510,"kind":"organization","name":"BCSF Holdings, L.P.","position":3,"cik":"0001683647","reported_name":"BCSF Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"See Footnote (1)"}}],"security":"Common Stock","published_at":"2019-05-16T16:41:36.000Z","date":"2019-05-14","kind":"other","acquired":false,"shares":6544098.85,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Distributions on May 14, May 15, and May 16, 2019 of 6,544,098.85, 2,176,110.71, and 182,818.40 shares of the Issuer's common stock (\"Common Stock\"), respectively, by BCSF Holdings, LP (\"BCSF Holdings\"), in all instances for no consideration, to certain of its limited partners.  As of May 14, 2019, BCSF Holdings ceased to be the record owner of more than 10% of the Issuer's Common Stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"As of May 16, 2019, shares of Common Stock are directly held by the following entities: (a) 1,713,234.83 by BCSF Holdings, whose general partner is BCSF Holdings Investors, L.P. (\"BCSF Holdings GP\"), (b) 7,293,065.48 by Bain Capital Distressed and Special Situations 2016 (F), L.P. (\"F Holdings\"), whose general partner is Bain Capital Distressed and Special Situations 2016 Investors (F), L.P. (\"F Holdings GP\"), and (c) 1,403,187.19 by Bain Capital Credit Holdings (MRF), L.P. (\"MRF Holdings\" and together with BCSF Holdings and F Holdings, the \"Funds\"), whose general partner is Bain Capital Credit Holdings Investors (MRF), LP (\"MRF Holdings GP\").  Bain Capital Credit Member, LLC (\"BCCM\") is the general partner of BCSF Holdings GP, F Holdings GP and MRF Holdings GP."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of May 16, 2019, BCCM may be deemed to share beneficial ownership of all 10,427,487.50 shares of Common Stock held of record by the Funds, but disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein."}],"balance_after":12786416.61,"source":{"system":"sec-edgar","filing":"0001567619-19-011434","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1683647/000156761919011434/doc1.xml","form_type":"4"}},{"id":3634958,"issuer":{"id":5138,"kind":"organization","name":"Bain Capital Specialty Finance, Inc."},"owners":[{"id":127977,"kind":"person","name":"Hawkins Jeffrey B.","position":1,"cik":"0001679754","reported_name":"Hawkins Jeffrey 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