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(the \"Company\") to purchase 298,508 shares of the Company's common stock, par value $0.00001 per share (the \"Common Stock\"), and accompanying warrants to purchase up to 298,508 shares of Common Stock (the \"Warrants\"), in a private placement (the \"Offering\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each share of Common Stock and accompanying Warrant were issued at a combined purchase price of $1.675."}],"balance_after":301571,"source":{"system":"sec-edgar","filing":"0001493152-26-042794","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2010662/000149315226042794/ownership.xml","form_type":"4"}},{"id":729442,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":30860,"kind":"person","name":"Hoffman Robert E.","position":1,"cik":"0001166288","reported_name":"Hoffman Robert E.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2026-06-24T00:02:13.000Z","date":"2026-06-23","kind":"grant","planned":false,"acquired":true,"shares":30803,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The options will vest in full upon the earlier of (i) the first anniversary of the date of grant or (ii) the date of the next annual meeting."}],"balance_after":30803,"derivative":{"exercise_price":0.7503,"expiration_date":"2036-06-22","underlying":"Common Stock","underlying_shares":30803},"source":{"system":"sec-edgar","filing":"0001493152-26-029851","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1166288/000149315226029851/ownership.xml","form_type":"4"}},{"id":728467,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":35856,"kind":"person","name":"Cilento Richard C. 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One fourth (1/4th) of the option shares shall vest on the one-year anniversary of the grant date, and the remaining balance of the option shares shall vest in 36 equal consecutive monthly installments thereafter until fully vested so long as the reporting person remains in continuous service through such applicable vesting periods."}],"balance_after":92410,"derivative":{"exercise_price":1.38,"expiration_date":"2036-05-04","underlying":"Common Stock","underlying_shares":92410},"source":{"system":"sec-edgar","filing":"0001493152-26-021175","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1569334/000149315226021175/ownership.xml","form_type":"4"}},{"id":793450,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49877,"kind":"person","name":"Khoja Hamid","position":1,"cik":"0002010662","reported_name":"Khoja Hamid","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Scientific Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-05-04T23:00:53.000Z","date":"2026-05-04","kind":"grant","planned":false,"acquired":true,"shares":61607,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"On May 4, 2026, the reporting person was granted an option to purchase 61,607 shares of common stock. One fourth (1/4th) of the option shares shall vest on the one-year anniversary of the grant date, and the remaining balance of the option shares shall vest in 36 equal consecutive monthly installments thereafter until fully vested so long as the reporting person remains in continuous service through such applicable vesting periods"}],"balance_after":61607,"derivative":{"exercise_price":1.38,"expiration_date":"2036-05-04","underlying":"Common Stock","underlying_shares":61607},"source":{"system":"sec-edgar","filing":"0001493152-26-021174","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1958777/000149315226021174/ownership.xml","form_type":"4"}},{"id":793724,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49940,"kind":"person","name":"Davis Jason","position":1,"cik":"0001443533","reported_name":"Davis Jason","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-05-04T23:00:41.000Z","date":"2026-05-04","kind":"grant","planned":false,"acquired":true,"shares":61607,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"On May 4, 2026, the reporting person was granted an option to purchase 61,607 shares of common stock. One fourth (1/4th) of the option shares shall vest on the one-year anniversary of the grant date, and the remaining balance of the option shares shall vest in 36 equal consecutive monthly installments thereafter until fully vested so long as the reporting person remains in continuous service through such applicable vesting periods."}],"balance_after":61607,"derivative":{"exercise_price":1.38,"expiration_date":"2036-05-04","underlying":"Common Stock","underlying_shares":61607},"source":{"system":"sec-edgar","filing":"0001493152-26-021173","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1443533/000149315226021173/ownership.xml","form_type":"4"}},{"id":794077,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49990,"kind":"person","name":"GARCIA RUBEN A","position":1,"cik":"0002013617","reported_name":"GARCIA RUBEN A","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-05-04T23:00:19.000Z","date":"2026-05-04","kind":"grant","planned":false,"acquired":true,"shares":61607,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"On May 4, 2026, the reporting person was granted an option to purchase 61,607 shares of common stock. One fourth (1/4th) of the option shares shall vest on the one-year anniversary of the grant date, and the remaining balance of the option shares shall vest in 36 equal consecutive monthly installments thereafter until fully vested so long as the reporting person remains in continuous service through such applicable vesting periods."}],"balance_after":61607,"derivative":{"exercise_price":1.38,"expiration_date":"2036-05-04","underlying":"Common Stock","underlying_shares":61607},"source":{"system":"sec-edgar","filing":"0001493152-26-021172","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2013617/000149315226021172/ownership.xml","form_type":"4"}},{"id":857642,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49877,"kind":"person","name":"Khoja Hamid","position":1,"cik":"0002010662","reported_name":"Khoja Hamid","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2026-03-05T13:00:15.000Z","date":"2026-03-04","kind":"purchase","planned":false,"acquired":true,"shares":30000,"price":0.38,"value":11400.0,"ownership":{"direct":true},"balance_after":61250,"source":{"system":"sec-edgar","filing":"0001493152-26-008933","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1958777/000149315226008933/ownership.xml","form_type":"4"}},{"id":860735,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49905,"kind":"person","name":"O'HEERON PETE","position":1,"cik":"0001569334","reported_name":"O'HEERON PETE","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF EXECUTIVE OFFICER"}}],"security":"Common Stock","published_at":"2026-03-04T22:50:10.000Z","date":"2026-03-04","kind":"purchase","planned":false,"acquired":true,"shares":15872,"price":0.3784,"value":6005.9648,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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These shares were purchased in multiple transactions ranging from $0.3210 to $0.4166 on March 2, 2026, $0.3885 to $0.4302 on March 3, 2026, and $0.3730 to $0.3820 on March 4, 2026. 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These shares were purchased in multiples transactions ranging from $1.82 to $2.017 on August 12, 2024. The reporting person will provide upon request to the SEC, the issuer, or security holder of the Issuer, full information regarding the number of shares purchased at each separate price."}],"balance_after":6056647,"source":{"system":"sec-edgar","filing":"0001493152-24-031439","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1569334/000149315224031439/ownership.xml","form_type":"4"}},{"id":1435710,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49877,"kind":"person","name":"Khoja Hamid","position":1,"cik":"0002010662","reported_name":"Khoja Hamid","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Scientific Officer"}}],"security":"Common Stock","published_at":"2024-08-13T01:58:39.000Z","date":"2024-08-12","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":1.9,"value":19000.0,"ownership":{"direct":true},"balance_after":11250,"source":{"system":"sec-edgar","filing":"0001493152-24-031438","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1958777/000149315224031438/ownership.xml","form_type":"4"}},{"id":1587254,"issuer":{"id":7875,"kind":"organization","name":"FibroBiologics, Inc.","symbol":"FBLG"},"owners":[{"id":49990,"kind":"person","name":"GARCIA RUBEN A","position":1,"cik":"0002013617","reported_name":"GARCIA RUBEN A","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-03-08T21:14:06.000Z","date":"2024-03-01","kind":"grant","planned":false,"acquired":true,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"On March 1, 2024, the reporting person was granted an option to purchase 180,000 shares of common stock. One fourth (1/4th) of the option shares shall vest on the one year anniversary of the grant date, and the remaining balance of the option shares shall vest in 36 equal consecutive monthly installments thereafter until fully vested so long as the reporting person remains in continuous service through such applicable vesting periods."}],"balance_after":180000,"derivative":{"exercise_price":13,"expiration_date":"2034-02-28","underlying":"Common Stock","underlying_shares":180000},"source":{"system":"sec-edgar","filing":"0001493152-24-009398","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2013617/000149315224009398/ownership.xml","form_type":"4"}}]}