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shall vest on the earlier of the 12-month anniversary of the prior annual shareholders' meeting or the current year annual shareholder' meeting, subject to acceleration upon a change in control."}],"balance_after":22000,"derivative":{"exercise_price":0,"underlying":"Ordinary Share","underlying_shares":22000},"source":{"system":"sec-edgar","filing":"0001852117-21-000045","document":"wf-form4_163475987757655.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1852117/000185211721000045/wf-form4_163475987757655.xml","form_type":"4"}},{"id":2985925,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial 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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."}],"balance_after":67590,"source":{"system":"sec-edgar","filing":"0001209191-20-057768","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919120057768/doc4.xml","form_type":"4"}},{"id":3248097,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2020-02-25T16:11:19.000Z","date":"2020-02-21","kind":"sale","acquired":false,"shares":3559,"price":5.12,"value":18222.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. 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 $5.12 to $5.25, inclusive. The reporting person undertakes 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":71417,"source":{"system":"sec-edgar","filing":"0001209191-20-012430","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919120012430/doc4.xml","form_type":"4"}},{"id":3358391,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2019-11-26T17:42:40.000Z","date":"2019-11-22","kind":"grant","acquired":true,"shares":75000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The stock option grant will vest and become exercisable upon the attainment of both performance-based and service-based hurdles, as follows:  (i) 20% of the shares subject to the option, if the average closing price of the common stock reported by Nasdaq for any thirty (30) consecutive trading days equals or exceeds $10; plus an additional (ii) 40% of the shares, if the average closing price equals or exceeds $20; plus an additional (iii) 40% of the shares, if the average closing price equals or exceeds $30; in each case, subject to the continuous employment or service through the later of the date that the performance hurdles set forth above are attained (but no later than December 31, 2024) and December 31, 2021."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"To the extent unvested as of December 31, 2024, all unvested shares underlying such performance-based option will be cancelled."}],"balance_after":75000,"derivative":{"exercise_price":2.01,"expiration_date":"2029-11-22","underlying":"Common Stock","underlying_shares":75000},"source":{"system":"sec-edgar","filing":"0001209191-19-058162","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919119058162/doc4.xml","form_type":"4"}},{"id":3374078,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2019-11-12T16:26:14.000Z","date":"2019-11-08","kind":"sale","acquired":false,"shares":3922,"price":2.05,"value":8040.1,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.  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 $2.05 to $2.0675, inclusive.  The reporting person undertakes 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":74976,"source":{"system":"sec-edgar","filing":"0001209191-19-056008","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919119056008/doc4.xml","form_type":"4"}},{"id":3408703,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Employee Stock Option (Right to 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Separation."}],"balance_after":221312,"derivative":{"exercise_price":16.82,"expiration_date":"2028-01-02","underlying":"Common Stock","underlying_shares":221312},"source":{"system":"sec-edgar","filing":"0001209191-19-050308","document":"doc4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919119050308/doc4a.xml","form_type":"4/A","original_submission_date":"2019-04-03"}},{"id":3408701,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common 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The restricted stock unit award, granted as an annual performance award, vests as to 25% of the shares of common stock on the approximate anniversary of the grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"This report has been amended to reflect the number of shares received in a pro rata distribution as a result of the Separation."}],"balance_after":78898,"source":{"system":"sec-edgar","filing":"0001209191-19-050308","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919119050308/doc4a.xml","form_type":"4/A","original_submission_date":"2019-04-03"}},{"id":3408700,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2019-09-20T16:01:15.000Z","date":"2019-04-01","kind":"grant","acquired":true,"shares":38320,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"In connection with the separation of Cyclerion Therapeutics, Inc. (\"Cyclerion\") from Ironwood Pharmaceuticals Inc. (\"Ironwood\") effective April 1, 2019 (the \"Separation\"), the reporting person received a grant of 38,320 restricted stock units, each representing the right to receive a share of Cyclerion common stock, as a result of the adjustment of existing Ironwood restricted stock units held by the reporting person prior to the Separation.  The restricted stock unit award, granted as an annual performance award, vests as to 25% of the shares of common stock on the approximate anniversary of the grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This report has been amended to reflect the number of options that were assumed by the Issuer under its applicable mirror equity plan as a result of the Separation."}],"balance_after":38320,"source":{"system":"sec-edgar","filing":"0001209191-19-050308","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1723846/000120919119050308/doc4a.xml","form_type":"4/A","original_submission_date":"2019-04-03"}},{"id":3564587,"issuer":{"id":5213,"kind":"organization","name":"IRONWOOD PHARMACEUTICALS INC","symbol":"IRWD"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2019-04-03T22:10:17.000Z","date":"2019-04-01","kind":"disposition_to_issuer","acquired":false,"shares":242579,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents options to purchase Ironwood Class A Common Stock awarded to the reporting person prior to the Separation.  In connection with the Separation, the unvested portion of the Ironwood option award was replaced with options to purchase shares of Cyclerion Common Stock.  The exercise price of the vested portion of the Ironwood option award has been adjusted, and the reporting person received additional options to purchase shares of Cyclerion Common Stock, to preserve the pre-Separation intrinsic value of the vested portion of the Ironwood option award."},{"field":"shares","element":"transactionShares","label":"F3","text":"Represents options to purchase Ironwood Class A Common Stock awarded to the reporting person prior to the Separation.  In connection with the Separation, the unvested portion of the Ironwood option award was replaced with options to purchase shares of Cyclerion Common Stock.  The exercise price of the vested portion of the Ironwood option award has been adjusted, and the reporting person received additional options to purchase shares of Cyclerion Common Stock, to preserve the pre-Separation intrinsic value of the vested portion of the Ironwood option award."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents options to purchase Ironwood Class A Common Stock awarded to the reporting person prior to the Separation.  In connection with the Separation, the unvested portion of the Ironwood option award was replaced with options to purchase shares of Cyclerion Common Stock.  The exercise price of the vested portion of the Ironwood option award has been adjusted, and the reporting person received additional options to purchase shares of Cyclerion Common Stock, to preserve the pre-Separation intrinsic value of the vested portion of the Ironwood option award."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The remaining 16,171 shares are presently exercisable in full."}],"balance_after":16171,"derivative":{"exercise_price":11.49,"expiration_date":"2029-01-29","underlying":"Class A Common Stock","underlying_shares":242579},"source":{"system":"sec-edgar","filing":"0001209191-19-023429","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1446847/000120919119023429/doc4.xml","form_type":"4"}},{"id":3564586,"issuer":{"id":5213,"kind":"organization","name":"IRONWOOD PHARMACEUTICALS INC","symbol":"IRWD"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2019-04-03T22:10:17.000Z","date":"2019-04-01","kind":"disposition_to_issuer","acquired":false,"shares":232032,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents options to purchase Ironwood Class A Common Stock awarded to the reporting person prior to the Separation.  In connection with the Separation, the unvested portion of the Ironwood option award was replaced with options to purchase shares of Cyclerion Common Stock.  The exercise price of the vested portion of the Ironwood option award has been adjusted, and the reporting person received additional options to purchase shares of Cyclerion Common Stock, to preserve the pre-Separation intrinsic value of the vested portion of the Ironwood option award."},{"field":"shares","element":"transactionShares","label":"F3","text":"Represents options to purchase Ironwood Class A Common Stock awarded to the reporting person prior to the Separation.  In connection with the Separation, the unvested portion of the Ironwood option award was replaced with options to purchase shares of Cyclerion Common Stock.  The exercise price of the vested portion of the Ironwood option award has been adjusted, and the reporting person received additional options to purchase shares of Cyclerion Common Stock, to preserve the pre-Separation intrinsic value of the vested portion of the Ironwood option award."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents options to purchase Ironwood Class A Common Stock awarded to the reporting person prior to the Separation.  In connection with the Separation, the unvested portion of the Ironwood option award was replaced with options to purchase shares of Cyclerion Common Stock.  The exercise price of the vested portion of the Ironwood option award has been adjusted, and the reporting person received additional options to purchase shares of Cyclerion Common Stock, to preserve the pre-Separation intrinsic value of the vested portion of the Ironwood option award."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The remaining 105,468 shares are presently exercisable in full."}],"balance_after":105468,"derivative":{"exercise_price":13.6,"expiration_date":"2028-01-02","underlying":"Class A Common Stock","underlying_shares":232032},"source":{"system":"sec-edgar","filing":"0001209191-19-023429","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1446847/000120919119023429/doc4.xml","form_type":"4"}},{"id":3564585,"issuer":{"id":5213,"kind":"organization","name":"IRONWOOD PHARMACEUTICALS INC","symbol":"IRWD"},"owners":[{"id":124160,"kind":"person","name":"Huyett William","position":1,"cik":"0001723846","reported_name":"Huyett William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Class A Common Stock","published_at":"2019-04-03T22:10:17.000Z","date":"2019-04-01","kind":"grant","acquired":true,"shares":1483,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"In connection with the Separation, the reporting person received 1,483 restricted stock units as a result of the adjustment of existing Ironwood restricted stock units held by the reporting person prior to the Separation.  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