{"transactions":[{"id":4615061,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"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":183131,"kind":"person","name":"Fairmount Healthcare Co-Invest VI L.P.","position":3,"cik":"0002124208","reported_name":"Fairmount Healthcare Co-Invest VI L.P.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":2224,"kind":"person","name":"Kiselak Tomas","position":4,"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":5,"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":"2026-09-10T21:44:57.000Z","date":"2026-09-09","kind":"grant","planned":false,"acquired":true,"shares":48445,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By: Tomas Kiselak"},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents a right to purchase 48,445 shares of the Issuer's common stock. This option will vest in equal monthly installments through September 9, 2029, subject to the Reporting Person's continued service to the Issuer on each such vesting date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Fairmount Funds Management LLC (\"Fairmount\") is the investment manager for Fairmount Healthcare Fund II L.P. (\"Fund II\") and Fairmount Healthcare Co-Invest VI L.P. (\"Co-Invest\"). Peter Harwin and Tomas Kiselak are the managers of Fairmount. Under Mr. Kiselak's arrangement with 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. 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":48445,"derivative":{"exercise_price":26.2,"expiration_date":"2036-09-09","underlying":"Common Stock","underlying_shares":48445},"source":{"system":"sec-edgar","filing":"0001193125-26-388142","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2124208/000119312526388142/ownership.xml","form_type":"4"}}]}