{"transactions":[{"id":1258543,"issuer":{"id":6242,"kind":"organization","name":"Keros Therapeutics, Inc."},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2025-02-19T21:15:19.000Z","date":"2025-02-18","kind":"grant","planned":false,"acquired":true,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a restricted stock unit (\"RSU\") award.  The RSUs vest as follows: 33% of the RSUs shall vest on February 17, 2026, an additional 34% of the total number of RSUs shall vest on August 15, 2026, and the remaining 33% of the total number of RSUs shall vest on February 16, 2027, in each case, subject to the Reporting Person's Continuous Service (as defined in the 2020 Plan) through each applicable vesting date."}],"balance_after":44000,"source":{"system":"sec-edgar","filing":"0001415889-25-004598","document":"form4-02192025_040212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1664710/000141588925004598/form4-02192025_040212.xml","form_type":"4"}},{"id":1368134,"issuer":{"id":6242,"kind":"organization","name":"Keros Therapeutics, Inc."},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Employee  Stock Option (right to buy)","published_at":"2024-11-12T21:15:17.000Z","date":"2024-11-08","kind":"grant","planned":false,"acquired":true,"shares":110000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"25% of the shares subject to the option shall vest on November 1, 2025, and 6.25% of the shares subject to the option shall vest in equal quarterly installments thereafter, subject to the Reporting Person continuing to provide service through each such date."}],"balance_after":110000,"derivative":{"exercise_price":67.91,"expiration_date":"2034-11-07","underlying":"Common Stock","underlying_shares":110000},"source":{"system":"sec-edgar","filing":"0001415889-24-026598","document":"form4-11122024_041110.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1664710/000141588924026598/form4-11122024_041110.xml","form_type":"4"}},{"id":1756103,"issuer":{"id":15643,"kind":"organization","name":"Tourmaline Bio, Inc.","symbol":"TRML"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2023-10-23T20:20:18.000Z","date":"2023-10-23","kind":"grant","planned":false,"acquired":true,"shares":73211,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The shares subject to the option vest as to 25% of the shares on October 23, 2024 with the remainder vesting in the following 36 equal monthly installments, subject to the Reporting Person's continued service on each such vesting date."}],"balance_after":73211,"derivative":{"exercise_price":9.46,"expiration_date":"2033-10-22","underlying":"Common Stock","underlying_shares":73211},"source":{"system":"sec-edgar","filing":"0001209191-23-053391","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1740377/000120919123053391/doc4.xml","form_type":"4"}},{"id":1756102,"issuer":{"id":15643,"kind":"organization","name":"Tourmaline Bio, Inc.","symbol":"TRML"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2023-10-23T20:20:18.000Z","date":"2023-10-19","kind":"grant","planned":false,"acquired":true,"shares":144215,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Upon the closing of the Merger, each outstanding option to purchase shares of Tourmaline common stock was assumed by the Issuer and converted into an option to purchase the Issuer's common stock, on the same terms and conditions as were applicable to such Tourmaline stock option prior to the Merger, as adjusted for the exchange ratio and the reverse stock split."},{"field":"shares","element":"transactionShares","label":"F3","text":"Upon the closing of the Merger, each outstanding option to purchase shares of Tourmaline common stock was assumed by the Issuer and converted into an option to purchase the Issuer's common stock, on the same terms and conditions as were applicable to such Tourmaline stock option prior to the Merger, as adjusted for the exchange ratio and the reverse stock split."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Upon the closing of the Merger, each outstanding option to purchase shares of Tourmaline common stock was assumed by the Issuer and converted into an option to purchase the Issuer's common stock, on the same terms and conditions as were applicable to such Tourmaline stock option prior to the Merger, as adjusted for the exchange ratio and the reverse stock split."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Received in exchange for a stock option to acquire 1,807,900 shares of Tourmaline common stock pursuant to the Merger Agreement."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares subject to the option vest as to 25% of the shares on June 14, 2024 with the remainder vesting in the following 36 equal monthly installments, subject to the Reporting Person's continued service on each such vesting date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F3","text":"Upon the closing of the Merger, each outstanding option to purchase shares of Tourmaline common stock was assumed by the Issuer and converted into an option to purchase the Issuer's common stock, on the same terms and conditions as were applicable to such Tourmaline stock option prior to the Merger, as adjusted for the exchange ratio and the reverse stock split."}],"balance_after":144215,"derivative":{"exercise_price":7.9,"expiration_date":"2033-06-17","underlying":"Common Stock","underlying_shares":144215},"source":{"system":"sec-edgar","filing":"0001209191-23-053391","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1740377/000120919123053391/doc4.xml","form_type":"4"}},{"id":1756101,"issuer":{"id":15643,"kind":"organization","name":"Tourmaline Bio, Inc.","symbol":"TRML"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2023-10-23T20:20:18.000Z","date":"2023-10-19","kind":"grant","planned":false,"acquired":true,"shares":56836,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"41,443 of these shares are subject to a repurchase option in favor of the Issuer in the event that the Reporting Person's continuous service is terminated. Such repurchase option shall lapse in equal monthly installments until such shares are fully vested on June 1, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Received in exchange for 712,500 shares of common stock of Tourmaline Bio, Inc. (\"Tourmaline\") pursuant to an Agreement and Plan of Merger dated as of June 22, 2023 (the \"Merger Agreement\") by and among Tourmaline, the Issuer and Terrain Merger Sub, Inc., a wholly owned subsidiary of the Issuer (\"Merger Sub\"). Under the terms of the Merger Agreement, on October 19, 2023, Merger Sub merged with and into Tourmaline (the \"Merger\"), with Tourmaline surviving the Merger as a wholly owned subsidiary of the Issuer. Upon the closing of the Merger, each share of Tourmaline common stock was converted into the right to receive 0.07977 of a share of the Issuer's common stock, after giving effect to a reverse stock split of the Issuer's common stock of 10-for-1. Subsequent to the Merger, the name of the Issuer was changed from Talaris Therapeutics, Inc. to Tourmaline Bio, Inc."}],"balance_after":56836,"source":{"system":"sec-edgar","filing":"0001209191-23-053391","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1740377/000120919123053391/doc4.xml","form_type":"4"}},{"id":2394625,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2022-02-15T22:15:35.000Z","date":"2022-02-14","kind":"grant","acquired":true,"shares":37500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Options vest and become exercisable in sixteen quarterly installments over four years. Vesting commenced on January 1, 2022 and the first vesting event shall occur three months thereafter; provided the reporting person continues to have a service relationship with the Company on such vesting date."}],"balance_after":37500,"derivative":{"exercise_price":18.08,"expiration_date":"2032-02-14","underlying":"Common Stock","underlying_shares":37500},"source":{"system":"sec-edgar","filing":"0001104659-22-023861","document":"tm226853-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000110465922023861/tm226853-1_4seq1.xml","form_type":"4"}},{"id":2394624,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2022-02-15T22:15:35.000Z","date":"2022-02-14","kind":"grant","acquired":true,"shares":37500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit (\"RSU\") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock. The shares subject to this RSU vest in four annual installments over four years, with the first annual installment to vest on January 15, 2023 and each additional installment to vest annually thereafter; provided the reporting person continues to have a service relationship with the Company on such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Consists of 209,183 shares of common stock and 49,313 RSUs."}],"balance_after":258496,"source":{"system":"sec-edgar","filing":"0001104659-22-023861","document":"tm226853-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000110465922023861/tm226853-1_4seq1.xml","form_type":"4"}},{"id":2432370,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2022-01-20T00:01:12.000Z","date":"2022-01-18","kind":"tax_withholding","acquired":false,"shares":1421,"price":19.463,"value":27656.923,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares required to be sold by the reporting person to cover the tax withholding obligation in connection with the vesting of restricted stock units (\"RSU\") on January 15, 2022. This sale is mandated by the Issuer's election under its equity incentive plans to require the reporting person to fund this tax withholding obligation by completing a \"sell to cover\" transaction with a brokerage firm designated by the Issuer. This sale does not represent a discretionary trade by the reporting person. The shares vested pursuant to an award that was granted on February 1, 2021. Each RSU represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.  The shares subject to this RSU award vest annually over four years, subject to a continued service relationship with the Issuer on such vesting date."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported above represents the weighted average selling price, as the transaction was executed in multiple trades. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected to the SEC staff upon request."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Consists of 209,183 shares of common stock and 11,813 RSUs."}],"balance_after":220996,"source":{"system":"sec-edgar","filing":"0001104659-22-005566","document":"tm223899-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000110465922005566/tm223899-2_4seq1.xml","form_type":"4"}},{"id":2882066,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-02-03T22:10:36.000Z","date":"2021-02-01","kind":"grant","acquired":true,"shares":52500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Shares will vest and become exercisable quarterly over four years, subject to a continued service relationship with the Issuer on such vesting date."}],"balance_after":225534,"derivative":{"exercise_price":58.93,"expiration_date":"2031-02-01","underlying":"Common Stock","underlying_shares":52500},"source":{"system":"sec-edgar","filing":"0001179110-21-001253","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000117911021001253/edgar.xml","form_type":"4"}},{"id":2882065,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2021-02-03T22:10:36.000Z","date":"2021-02-01","kind":"grant","acquired":true,"shares":15750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit (\"RSU\") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock. The shares subject to this RSU award will vest and become exercisable quarterly over four years, subject to a continued service relationship with the Issuer on such vesting date."}],"balance_after":15750,"source":{"system":"sec-edgar","filing":"0001179110-21-001253","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000117911021001253/edgar.xml","form_type":"4"}},{"id":3282206,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2020-02-10T22:22:31.000Z","date":"2020-02-06","kind":"grant","acquired":true,"shares":75000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Shares will vest and become exercisable quarterly over four years, with the first vesting event on April 1, 2020; subject to a continued service relationship with the company on each such vesting date."}],"balance_after":75000,"derivative":{"exercise_price":13.52,"expiration_date":"2024-01-01","underlying":"Common Stock","underlying_shares":75000},"source":{"system":"sec-edgar","filing":"0001179110-20-001383","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000117911020001383/edgar.xml","form_type":"4"}},{"id":3677740,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":83031,"kind":"person","name":"CHYUNG YUNG H.","position":1,"cik":"0001740377","reported_name":"CHYUNG YUNG H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2019-02-05T00:37:14.000Z","date":"2019-01-31","kind":"grant","acquired":true,"shares":56000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option vests quarterly over four (4) years, with the first quarterly amount vesting on March 31, 2019."}],"balance_after":56000,"derivative":{"exercise_price":15.11,"expiration_date":"2029-01-31","underlying":"Common Stock","underlying_shares":56000},"source":{"system":"sec-edgar","filing":"0001104659-19-005624","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000110465919005624/a4.xml","form_type":"4"}}]}