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Fairmount, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein."}],"balance_after":1897677,"source":{"system":"sec-edgar","filing":"0001104659-25-097921","document":"tm2528311-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2042283/000110465925097921/tm2528311-1_4seq1.xml","form_type":"4"}},{"id":1088072,"issuer":{"id":4757,"kind":"organization","name":"Jade Biosciences, Inc."},"owners":[{"id":66507,"kind":"person","name":"Dahms Bradford D.","position":1,"cik":"0001787307","reported_name":"Dahms Bradford D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2025-07-14T23:12:40.000Z","date":"2025-07-14","kind":"grant","planned":false,"acquired":true,"shares":526000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents a right to purchase 526,000 shares of the Issuer's common stock, one quarter of which will vest on July 14, 2026, with the remaining three quarters vesting in equal monthly installments over the following three years, subject to the Reporting Person's continued service to the Issuer on each such vesting date."}],"balance_after":526000,"derivative":{"exercise_price":9,"expiration_date":"2035-07-14","underlying":"Common Stock","underlying_shares":526000},"source":{"system":"sec-edgar","filing":"0000950170-25-095668","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1798749/000095017025095668/ownership.xml","form_type":"4"}},{"id":1142902,"issuer":{"id":4757,"kind":"organization","name":"Jade Biosciences, Inc."},"owners":[{"id":66504,"kind":"person","name":"Frohlich Tom","position":1,"cik":"0001823925","reported_name":"Frohlich Tom","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive  Officer"}}],"security":"Common Stock","published_at":"2025-05-19T20:54:17.000Z","date":"2025-05-16","kind":"purchase","planned":false,"acquired":true,"shares":6000,"price":7.4,"value":44400.0,"ownership":{"direct":true},"balance_after":6000,"source":{"system":"sec-edgar","filing":"0000950170-25-074496","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1798749/000095017025074496/ownership.xml","form_type":"4"}},{"id":1162511,"issuer":{"id":4757,"kind":"organization","name":"Jade Biosciences, Inc."},"owners":[{"id":2222,"kind":"person","name":"Fairmount Funds Management LLC","position":1,"cik":"0001802528","reported_name":"Fairmount Funds Management LLC","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":2223,"kind":"person","name":"Fairmount Healthcare Fund II L.P.","position":2,"cik":"0001769651","reported_name":"Fairmount Healthcare Fund II L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":2224,"kind":"person","name":"Kiselak Tomas","position":3,"cik":"0001830177","reported_name":"Kiselak Tomas","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":2225,"kind":"person","name":"Harwin Peter Evan","position":4,"cik":"0001663607","reported_name":"Harwin Peter Evan","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-05-01T22:16:57.000Z","date":"2025-04-29","kind":"grant","planned":false,"acquired":true,"shares":23017,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents a right to purchase 23,017 shares of the Issuer's common stock, which vests in full on the earlier of (i) April 29, 2026 or (ii) the date of the next annual meeting of the Issuer's stockholders, in each case, subject to the recipient's continued service to the Issuer."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Under Mr. Kiselak's arrangement with Fairmount Funds Management LLC (\"Fairmount\"), Mr. Kiselak holds the option for one or more investment vehicles managed by Fairmount (each, a \"Fairmount Fund\"). Mr. Kiselak is obligated to turn over to Fairmount any net cash or stock received from the option for the benefit of such Fairmount Fund. Mr. Kiselak therefore disclaims beneficial ownership of the option and underlying common stock. 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The Reporting Person is obligated to turn over to Fairmount any net cash or stock received from the option for the benefit of such Fairmount Fund. The Reporting Person therefore disclaims beneficial ownership of the option and underlying common stock. Fairmount disclaims beneficial ownership of any of the reported securities, except to the extent of its pecuniary interest therein."}],"balance_after":23017,"derivative":{"exercise_price":10.14,"expiration_date":"2035-04-29","underlying":"Common Stock","underlying_shares":23017},"source":{"system":"sec-edgar","filing":"0000950170-25-062102","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1817733/000095017025062102/ownership.xml","form_type":"4"}},{"id":1162508,"issuer":{"id":4757,"kind":"organization","name":"Jade Biosciences, Inc."},"owners":[{"id":36738,"kind":"person","name":"DOBMEIER ERIC","position":1,"cik":"0001202785","reported_name":"DOBMEIER ERIC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-05-01T22:00:21.000Z","date":"2025-04-29","kind":"grant","planned":false,"acquired":true,"shares":23017,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents a right to purchase 23,017 shares of the Issuer's common stock, which vests in full on the earlier of (i) April 29, 2026 or (ii) the date of the next annual meeting of the Issuer's stockholders, in each case, subject to the recipient's continued service to the Issuer."}],"balance_after":23017,"derivative":{"exercise_price":10.14,"expiration_date":"2035-04-29","underlying":"Common Stock","underlying_shares":23017},"source":{"system":"sec-edgar","filing":"0000950170-25-062091","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1798749/000095017025062091/ownership.xml","form_type":"4"}},{"id":1163392,"issuer":{"id":4757,"kind":"organization","name":"Jade Biosciences, Inc."},"owners":[{"id":19524,"kind":"organization","name":"RA CAPITAL MANAGEMENT, L.P.","position":1,"cik":"0001346824","reported_name":"RA CAPITAL MANAGEMENT, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":19525,"kind":"organization","name":"RA Capital Healthcare Fund LP","position":2,"cik":"0001315082","reported_name":"RA Capital Healthcare Fund LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":19526,"kind":"person","name":"Kolchinsky Peter","position":3,"cik":"0001384859","reported_name":"Kolchinsky Peter","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":19527,"kind":"person","name":"Shah Rajeev M.","position":4,"cik":"0001619841","reported_name":"Shah Rajeev M.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-04-30T20:52:39.000Z","date":"2025-04-28","kind":"other","planned":false,"acquired":true,"shares":1062326,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On April 28, 2025, the Issuer completed the transactions contemplated by the Agreement and Plan of Merger, dated October 30, 2024, by and among the Issuer, Caribbean Merger Sub I, Inc. (\"Merger Sub I\"), Caribbean Merger Sub II, LLC (\"Merger Sub II\") and Jade Biosciences, Inc. (\" Old Jade\"), pursuant to which, Merger Sub I merged with and into Old Jade, with Old Jade surviving the merger as the surviving corporation (the \"First Merger\"), and as part of the same overall transaction, Old Jade merged with and into Merger Sub II, with Merger Sub II continuing as a wholly owned subsidiary of the Issuer and the surviving corporation of the merger (the \"Second Merger\").  At the effective time of the First Merger, each share of Old Jade common stock was converted based on an exchange ratio (after giving effect to the Reverse Stock Split, as defined below) of 0.6311 shares of the Issuer's common stock for each share of Old Jade common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On April 28, 2025, the Issuer completed the transactions contemplated by the Agreement and Plan of Merger, dated October 30, 2024, by and among the Issuer, Caribbean Merger Sub I, Inc. (\"Merger Sub I\"), Caribbean Merger Sub II, LLC (\"Merger Sub II\") and Jade Biosciences, Inc. (\" Old Jade\"), pursuant to which, Merger Sub I merged with and into Old Jade, with Old Jade surviving the merger as the surviving corporation (the \"First Merger\"), and as part of the same overall transaction, Old Jade merged with and into Merger Sub II, with Merger Sub II continuing as a wholly owned subsidiary of the Issuer and the surviving corporation of the merger (the \"Second Merger\").  At the effective time of the First Merger, each share of Old Jade common stock was converted based on an exchange ratio (after giving effect to the Reverse Stock Split, as defined below) of 0.6311 shares of the Issuer's common stock for each share of Old Jade common stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On April 28, 2025, the Issuer effected a 1-for-35 reverse stock split of its common stock stock (the \"Reverse Stock Split\"). The share counts herein reflect the reverse stock split."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Held directly by RA Capital Healthcare Fund, L.P. (the \"Fund\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"RA Capital Management, L.P. (the \"Adviser\") is the investment manager for the Fund, RA Capital Nexus Fund, L.P. (the \"Nexus Fund\") and a separately managed account (the \"Account\"). The general partner of the Adviser is RA Capital Management GP, LLC (the \"Adviser GP\"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, the Fund, the Nexus Fund, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein."}],"balance_after":1287858,"source":{"system":"sec-edgar","filing":"0001415889-25-011583","document":"form4-04302025_080436.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1798749/000141588925011583/form4-04302025_080436.xml","form_type":"4"}},{"id":1443070,"issuer":{"id":4757,"kind":"organization","name":"Jade Biosciences, Inc."},"owners":[{"id":88536,"kind":"person","name":"Dake Benjamin T","position":1,"cik":"0001869248","reported_name":"Dake Benjamin T","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SEE REMARKS"}}],"security":"Stock Option (Right to 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These shares were purchased in multiple transactions at prices ranging from $1.51 to $1.75 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Held directly by RA Capital Healthcare Fund, L.P. (the \"Fund\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"RA Capital Management, L.P. (the \"Adviser\") is the investment manager for the Fund, RA Capital Nexus Fund, L.P. (the \"Nexus Fund\") and a separately managed account (the \"Account\"). The general partner of the Adviser is RA Capital Management GP, LLC (the \"Adviser GP\"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. 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Mr. Resnick is obligated to turn over to the Adviser any net cash or stock received upon exercise of the option, which will offset advisory fees owed by the Fund to the Adviser. 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