{"transactions":[{"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":1438939,"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":"Stock Option (Right to Buy)","published_at":"2024-08-07T20:05:04.000Z","date":"2024-08-05","kind":"grant","planned":false,"acquired":true,"shares":55849,"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 55,849 shares of the Corporation's common stock pursuant to the 2019 Equity Incentive Plan. These 55,849 shares vest ratably in\nmonthly installments over a 48-month period commencing August 31, 2024 and ending July 31, 2028, provided that the Reporting Person remains employed by Cyclerion Therapeutics, Inc. on such\napplicable vesting date, subject to certain exemptions."}],"balance_after":55849,"derivative":{"exercise_price":3.3,"expiration_date":"2034-08-05","underlying":"Common Stock","underlying_shares":55849},"source":{"system":"sec-edgar","filing":"0000950170-24-092733","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2002981/000095017024092733/ownership.xml","form_type":"4"}},{"id":1669834,"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":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2024-01-26T21:05:31.000Z","date":"2024-01-01","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The Reporting Person was granted 50,000 shares of restricted stock pursuant to the Cyclerion Therapeutics, Inc. 2019 Equity Incentive Plan. 10,000 of the shares vest immediately and the remaining 40,000 shares are subject to vesting ratably over a 48-month period, provided that the Reporting Person remains employed by Cyclerion Therapeutics, Inc. on such applicable vesting date, subject to certain exemptions."}],"balance_after":100303,"source":{"system":"sec-edgar","filing":"0000950170-24-007917","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2002981/000095017024007917/ownership.xml","form_type":"4"}}]}