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These shares were purchased in multiple transactions at prices ranging from $2.48 to $2.60, inclusive. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, full information regarding the number of shares purchased at each price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reporting person acquired 2,204 and 2,500 shares of Common Stock under the issuer's employee stock purchase plan on November 29, 2019 and May 29, 2020, respectively."}],"balance_after":254704,"source":{"system":"sec-edgar","filing":"0001209191-20-058031","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755237/000120919120058031/doc4.xml","form_type":"4"}},{"id":2989305,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":60649,"kind":"person","name":"Busch Andreas","position":1,"cik":"0001775029","reported_name":"Busch Andreas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Innovation Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2020-11-06T21:43:51.000Z","date":"2020-11-04","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 Option vests as to 2.08333% of the shares of Common Stock on each monthly anniversary of November 4, 2020."}],"balance_after":75000,"derivative":{"exercise_price":2.48,"expiration_date":"2030-11-04","underlying":"Common Stock","underlying_shares":75000},"source":{"system":"sec-edgar","filing":"0001209191-20-057302","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755237/000120919120057302/doc4.xml","form_type":"4"}},{"id":3358353,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":60649,"kind":"person","name":"Busch Andreas","position":1,"cik":"0001775029","reported_name":"Busch Andreas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Innovation Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2019-11-26T22:41:15.000Z","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":"0001209191-19-058158","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755237/000120919119058158/doc4.xml","form_type":"4"}},{"id":3365392,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":60649,"kind":"person","name":"Busch Andreas","position":1,"cik":"0001775029","reported_name":"Busch Andreas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Innovation Officer"}}],"security":"Common Stock","published_at":"2019-11-19T21:02:59.000Z","date":"2019-11-15","kind":"purchase","acquired":true,"shares":125000,"price":1.82,"value":227500.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.79 to $1.87, inclusive. The reporting person will provide to the Issuer, any security holder of the Issuer or the SEC staff, upon request, full information regarding the number of shares purchased at each price within the range."}],"balance_after":125000,"source":{"system":"sec-edgar","filing":"0001209191-19-057112","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755237/000120919119057112/doc4.xml","form_type":"4"}},{"id":3544023,"issuer":{"id":7698,"kind":"organization","name":"Korsana Biosciences, Inc.","symbol":"KRSA"},"owners":[{"id":60649,"kind":"person","name":"Busch Andreas","position":1,"cik":"0001775029","reported_name":"Busch Andreas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Innovation Officer"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2019-05-01T21:18:34.000Z","date":"2019-04-29","kind":"grant","acquired":true,"shares":300000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option, granted as a new hire award, vests as to 25% of the shares of Common Stock on the first anniversary of April 29, 2019 and 1/48th of\nthe shares of Common Stock vest each month thereafter for the next 36 months, based on his continued employment by a subsidiary of the Issuer."}],"balance_after":300000,"derivative":{"exercise_price":15.4,"expiration_date":"2029-04-29","underlying":"Common Stock","underlying_shares":300000},"source":{"system":"sec-edgar","filing":"0001209191-19-026820","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755237/000120919119026820/doc4.xml","form_type":"4"}}]}