{"transactions":[{"id":4615062,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":183133,"kind":"person","name":"Pernice Michelle Patricia","position":1,"cik":"0002126413","reported_name":"Pernice Michelle Patricia","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2026-09-10T21:45:19.000Z","date":"2026-09-09","kind":"grant","planned":false,"acquired":true,"shares":48445,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents the right to purchase 48,445 shares of the Issuer's common stock and 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."}],"balance_after":48445,"derivative":{"exercise_price":26.2,"expiration_date":"2036-09-09","underlying":"Common Stock","underlying_shares":48445},"source":{"system":"sec-edgar","filing":"0001193125-26-388146","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2126413/000119312526388146/ownership.xml","form_type":"4"}},{"id":4615060,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":1948,"kind":"person","name":"Shah Nimish P","position":1,"cik":"0001698082","reported_name":"Shah Nimish P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2026-09-10T21:45:02.000Z","date":"2026-09-09","kind":"grant","planned":false,"acquired":true,"shares":48445,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents the right to purchase 48,445 shares of the Issuer's common stock and 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":"Under an agreement between the Reporting Person and Venrock Management, LLC (the \"Management Company\"), the Reporting Person is deemed to hold the reported option and the shares underlying the option for the sole benefit of the Management Company and must exercise the reported option solely upon the direction of the Management Company, which is entitled to the shares underlying the option. The Management Company may be deemed the indirect beneficial owner of the shares underlying the option, and the Reporting Person may be deemed the indirect beneficial owner of the reported shares underlying the option through his interest in the Management Company. The Reporting Person disclaims beneficial ownership of the reported shares except to the extent of his 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":"0001193125-26-388144","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755237/000119312526388144/ownership.xml","form_type":"4"}},{"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"}},{"id":4615059,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":78253,"kind":"person","name":"Gottesdiener Andrew","position":1,"cik":"0001972292","reported_name":"Gottesdiener Andrew","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2026-09-10T21:43:02.000Z","date":"2026-09-09","kind":"grant","planned":false,"acquired":true,"shares":48445,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option represents the right to purchase 48,445 shares of the Issuer's common stock and 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":"Under an agreement between the Reporting Person and Venrock Management, LLC (the \"Management Company\"), the Reporting Person is deemed to hold the reported option and the shares underlying the option for the sole benefit of the Management Company and must exercise the reported option solely upon the direction of the Management Company, which is entitled to the shares underlying the option. The Management Company may be deemed the indirect beneficial owner of the shares underlying the option, and the Reporting Person may be deemed the indirect beneficial owner of the reported shares underlying the option through his interest in the Management Company. The Reporting Person disclaims beneficial ownership of the reported shares except to the extent of his 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":"0001193125-26-388136","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1972292/000119312526388136/ownership.xml","form_type":"4"}},{"id":682662,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":22018,"kind":"person","name":"CHICKO RHONDA M.","position":1,"cik":"0001740376","reported_name":"CHICKO RHONDA M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Option to Purchase","published_at":"2026-08-18T21:27:18.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The Reporting Person was granted an option on August 7, 2025 to purchase up to 25,000 shares of the Corporation's common stock pursuant to the Issuer's 2019 Equity Incentive Plan. These 25,000 shares provided for vesting as follows: (i) 8,750 shares became immediately exercisable, and (ii) the remaining 16,250 shares were to vest ratably in monthly installments commencing August 31, 2025 and ending on February 28, 2028, provided that the Reporting Person remained as a consultant or employee of Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions.  On July 17, 2026, the Issuer's Board of Directors elected to accelerate in full the vesting of all then unvested options for the Reporting Person.  The Reporting Person exercised the option in full on August 14, 2026 and paid for the exercise by means of a cash payment to the Issuer for the full purchase price."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Reporting Person was granted an option on August 7, 2025 to purchase up to 25,000 shares of the Corporation's common stock pursuant to the Issuer's 2019 Equity Incentive Plan. These 25,000 shares provided for vesting as follows: (i) 8,750 shares became immediately exercisable, and (ii) the remaining 16,250 shares were to vest ratably in monthly installments commencing August 31, 2025 and ending on February 28, 2028, provided that the Reporting Person remained as a consultant or employee of Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions.  On July 17, 2026, the Issuer's Board of Directors elected to accelerate in full the vesting of all then unvested options for the Reporting Person.  The Reporting Person exercised the option in full on August 14, 2026 and paid for the exercise by means of a cash payment to the Issuer for the full purchase price."}],"balance_after":0,"derivative":{"exercise_price":2.355,"expiration_date":"2035-08-06","underlying":"Common Stock","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001193125-26-355721","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1740376/000119312526355721/ownership.xml","form_type":"4"}},{"id":682661,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":22018,"kind":"person","name":"CHICKO RHONDA M.","position":1,"cik":"0001740376","reported_name":"CHICKO RHONDA M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock, no par value","published_at":"2026-08-18T21:27:18.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":true,"shares":25000,"price":2.355,"value":58875.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The Reporting Person was granted an option on August 7, 2025 to purchase up to 25,000 shares of the Corporation's common stock pursuant to the Issuer's 2019 Equity Incentive Plan. These 25,000 shares provided for vesting as follows: (i) 8,750 shares became immediately exercisable, and (ii) the remaining 16,250 shares were to vest ratably in monthly installments commencing August 31, 2025 and ending on February 28, 2028, provided that the Reporting Person remained as a consultant or employee of Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions.  On July 17, 2026, the Issuer's Board of Directors elected to accelerate in full the vesting of all then unvested options for the Reporting Person.  The Reporting Person exercised the option in full on August 14, 2026 and paid for the exercise by means of a cash payment to the Issuer for the full purchase price."}],"balance_after":25018,"source":{"system":"sec-edgar","filing":"0001193125-26-355721","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1740376/000119312526355721/ownership.xml","form_type":"4"}},{"id":683812,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":22335,"kind":"person","name":"Graul Regina Margaret","position":1,"cik":"0002002981","reported_name":"Graul Regina Margaret","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Option to Purchase","published_at":"2026-08-18T21:21:27.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":false,"shares":55849,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The Reporting Person was granted an option on August 5, 2024 to purchase up to 55,849 shares of the Corporation's common stock pursuant to the 2019 Equity Incentive Plan, vesting ratably in monthly installments over a 48-month period commencing August 31, 2024 and ending July 31, 2028, provided that the Reporting Person remained employed by Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions.  On July 17, 2026, the Issuer's Board of Directors elected to accelerate in full the vesting of all then unvested options and all then unvested restricted shares for the Reporting Person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Reporting Person was granted an option on August 5, 2024 to purchase up to 55,849 shares of the Corporation's common stock pursuant to the 2019 Equity Incentive Plan, vesting ratably in monthly installments over a 48-month period commencing August 31, 2024 and ending July 31, 2028, provided that the Reporting Person remained employed by Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions.  On July 17, 2026, the Issuer's Board of Directors elected to accelerate in full the vesting of all then unvested options and all then unvested restricted shares for the Reporting Person."}],"balance_after":0,"derivative":{"exercise_price":3.3,"expiration_date":"2034-08-03","underlying":"Common Stock","underlying_shares":55849},"source":{"system":"sec-edgar","filing":"0001193125-26-355707","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2002981/000119312526355707/ownership.xml","form_type":"4"}},{"id":683811,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":22335,"kind":"person","name":"Graul Regina Margaret","position":1,"cik":"0002002981","reported_name":"Graul Regina Margaret","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, no par value","published_at":"2026-08-18T21:21:27.000Z","date":"2026-08-14","kind":"tax_withholding","planned":false,"acquired":false,"shares":48629,"price":3.79,"value":184303.91,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The Reporting Person exercised the option in full on August 14, 2026 and paid for the exercise by means of a cashless exercise, forfeiting options to purchase 48,629 shares as payment to the Issuer for the full exercise price."}],"balance_after":107523,"source":{"system":"sec-edgar","filing":"0001193125-26-355707","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2002981/000119312526355707/ownership.xml","form_type":"4"}},{"id":683810,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":22335,"kind":"person","name":"Graul Regina Margaret","position":1,"cik":"0002002981","reported_name":"Graul Regina Margaret","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, no par value","published_at":"2026-08-18T21:21:27.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":true,"shares":55849,"price":3.3,"value":184301.7,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The Reporting Person was granted an option on August 5, 2024 to purchase up to 55,849 shares of the Corporation's common stock pursuant to the 2019 Equity Incentive Plan, vesting ratably in monthly installments over a 48-month period commencing August 31, 2024 and ending July 31, 2028, provided that the Reporting Person remained employed by Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions.  On July 17, 2026, the Issuer's Board of Directors elected to accelerate in full the vesting of all then unvested options and all then unvested restricted shares for the Reporting Person."}],"balance_after":156152,"source":{"system":"sec-edgar","filing":"0001193125-26-355707","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2002981/000119312526355707/ownership.xml","form_type":"4"}},{"id":705696,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":29504,"kind":"person","name":"Hecht Peter M","position":1,"cik":"0001478485","reported_name":"Hecht Peter M","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A Convertible Preferred Stock","published_at":"2026-07-20T21:04:57.000Z","date":"2026-07-16","kind":"exercise","planned":false,"acquired":false,"shares":351037,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"All options to purchase Common Stock previously held by the reporting person were cancelled on July 16, 2026.  As a result, the reporting person no longer holds options to purchase Common Stock."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":351037},"source":{"system":"sec-edgar","filing":"0001193125-26-309048","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1478485/000119312526309048/ownership.xml","form_type":"4"}},{"id":705695,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":29504,"kind":"person","name":"Hecht Peter M","position":1,"cik":"0001478485","reported_name":"Hecht Peter M","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-07-20T21:04:57.000Z","date":"2026-07-16","kind":"exercise","planned":false,"acquired":true,"shares":351037,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the \"Series A Preferred Stock\") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof.  On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock."}],"balance_after":910240,"source":{"system":"sec-edgar","filing":"0001193125-26-309048","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1478485/000119312526309048/ownership.xml","form_type":"4"}},{"id":1069799,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":22018,"kind":"person","name":"CHICKO RHONDA M.","position":1,"cik":"0001740376","reported_name":"CHICKO RHONDA M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2025-08-11T20:05:06.000Z","date":"2025-08-07","kind":"grant","planned":false,"acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Reporting Person was granted an option to purchase up to 25,000 shares of the Corporation's common stock pursuant to the 2019 Equity Incentive Plan. 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Slate Path Capital LP (the \"Investment Manager\"), a Delaware limited partnership acts as the investment manager of the Slate Path Funds. Mr. David Greenspan serves as the managing member of Jades GP, LLC, a Delaware limited liability company and the general partner of the Investment Manager. The filing of this statement shall not be deemed an admission that either Reporting Person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. 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Each of PPGP VIII, the Reporting Person and the Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":24957,"source":{"system":"sec-edgar","filing":"0000899243-21-022327","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924321022327/doc4.xml","form_type":"4"}},{"id":2679647,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":27833,"kind":"person","name":"MCGUIRE TERRANCE","position":1,"cik":"0001117003","reported_name":"MCGUIRE TERRANCE","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-06-07T21:36:24.000Z","date":"2021-06-03","kind":"purchase","acquired":true,"shares":92831,"price":3.12,"value":289632.72,"ownership":{"direct":false,"nature":"By Polaris Partners VIII, L.P."},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 3, 2021, Polaris Partners VIII, L.P. 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Each of PPGP VIII, the Reporting Person and the Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":697313,"source":{"system":"sec-edgar","filing":"0000899243-21-022327","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924321022327/doc4.xml","form_type":"4"}},{"id":2679261,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":29504,"kind":"person","name":"Hecht Peter M","position":1,"cik":"0001478485","reported_name":"Hecht Peter M","relationship":{"director":true,"officer":true,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2021-06-07T21:25:44.000Z","date":"2021-06-03","kind":"purchase","acquired":true,"shares":823170,"price":3.28,"value":2699997.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 3, 2021, the reporting person agreed to purchase directly from the Issuer 823,170 shares of Common Stock of the Issuer in a private placement transaction."}],"balance_after":2047698,"source":{"system":"sec-edgar","filing":"0001140361-21-020090","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1478485/000114036121020090/form4.xml","form_type":"4"}},{"id":2678800,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":85668,"kind":"organization","name":"Slate Path Capital LP","position":1,"cik":"0001559706","reported_name":"Slate Path Capital LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":85669,"kind":"person","name":"Greenspan David Gerald","position":2,"cik":"0001820641","reported_name":"Greenspan David Gerald","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock, no par value","published_at":"2021-06-07T20:05:18.000Z","date":"2021-06-03","kind":"purchase","acquired":true,"shares":961538,"price":3.12,"value":2999998.56,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"The securities to which this filing relates are held by Slate Path Master Fund LP (the \"Master Fund\"), a Cayman Islands exempted limited partnership. Slate Path Capital LP (the \"Investment Manager\"), a Delaware limited partnership acts as the investment manager of the Master Fund. Mr. David Greenspan serves as the managing member of Jades GP, LLC, a Delaware limited liability company and the general partner of the Investment Manager. The filing of this statement shall not be deemed an admission that either Reporting Person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. 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This sale was made to cover tax withholding obligations in connection with the vesting and settlement of approximately 25% of the reporting person's restricted stock units granted on April 1, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.80 to $4.00, inclusive. 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