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The Reporting Person undertakes to provide the Issuer, any securityholder 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 range set forth in this footnote."}],"balance_after":50554,"source":{"system":"sec-edgar","filing":"0001599901-25-000045","document":"wk-form4_1738792857.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000045/wk-form4_1738792857.xml","form_type":"4"}},{"id":1281444,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Common Stock","published_at":"2025-02-05T22:01:04.000Z","date":"2025-02-03","kind":"exercise","planned":true,"acquired":true,"shares":5875,"price":16.65,"value":97818.75,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This option exercise and sale was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on June 12, 2024."}],"balance_after":56429,"source":{"system":"sec-edgar","filing":"0001599901-25-000045","document":"wk-form4_1738792857.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000045/wk-form4_1738792857.xml","form_type":"4"}},{"id":1296187,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Common Stock","published_at":"2025-01-24T01:08:22.000Z","date":"2025-01-22","kind":"sale","planned":true,"acquired":false,"shares":5629,"price":30.1609,"value":169775.7061,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This sale was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on June 12, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This represents a weighted-average price. These shares were sold in multiple transactions at prices ranging from $29.52 to $31.54. The Reporting Person undertakes to provide the Issuer, any securityholder 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 range set forth in this footnote."}],"balance_after":50554,"source":{"system":"sec-edgar","filing":"0001599901-25-000033","document":"wk-form4_1737680894.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000033/wk-form4_1737680894.xml","form_type":"4"}},{"id":1296186,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Common Stock","published_at":"2025-01-24T01:08:22.000Z","date":"2025-01-21","kind":"sale","planned":true,"acquired":false,"shares":1817,"price":28.593,"value":51953.481,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs on January 20, 2025 and the sale of the resulting shares of common stock on January 21, 2025. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a \"sell-to-cover\" transaction and does not represent a discretionary trade by the Reporting Person. The Reporting Person has executed an instruction letter for the automatic sale of such \"sell-to-cover\" shares, intended to satisfy the affirmative defense conditions of Rule 10b5-1."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This represents a weighted-average price. These shares were sold in multiple transactions at prices ranging from $28.59 to $29.08. The Reporting Person undertakes to provide the Issuer, any securityholder 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 range set forth in this footnote."}],"balance_after":56183,"source":{"system":"sec-edgar","filing":"0001599901-25-000033","document":"wk-form4_1737680894.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000033/wk-form4_1737680894.xml","form_type":"4"}},{"id":1296185,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Common Stock","published_at":"2025-01-24T01:08:22.000Z","date":"2025-01-21","kind":"sale","planned":true,"acquired":false,"shares":670,"price":28.5953,"value":19158.851,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs on January 20, 2025 and the sale of the resulting shares of common stock on January 21, 2025. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a \"sell-to-cover\" transaction and does not represent a discretionary trade by the Reporting Person. The Reporting Person has executed an instruction letter for the automatic sale of such \"sell-to-cover\" shares, intended to satisfy the affirmative defense conditions of Rule 10b5-1."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This represents a weighted-average price. These shares were sold in multiple transactions at prices ranging from $28.59 to $29.47. The Reporting Person undertakes to provide the Issuer, any securityholder 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 range set forth in this footnote."}],"balance_after":58000,"source":{"system":"sec-edgar","filing":"0001599901-25-000033","document":"wk-form4_1737680894.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000033/wk-form4_1737680894.xml","form_type":"4"}},{"id":1296184,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Common Stock","published_at":"2025-01-24T01:08:22.000Z","date":"2025-01-21","kind":"sale","planned":true,"acquired":false,"shares":1295,"price":28.59,"value":37024.05,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This sale was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on June 12, 2024."}],"balance_after":58670,"source":{"system":"sec-edgar","filing":"0001599901-25-000033","document":"wk-form4_1737680894.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000033/wk-form4_1737680894.xml","form_type":"4"}},{"id":1306366,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2025-01-09T01:16:31.000Z","date":"2025-01-06","kind":"grant","planned":false,"acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests in 48 equal installments on each monthly anniversary of the grant date, until it is fully vested on January 6, 2029."}],"balance_after":50000,"derivative":{"exercise_price":31.42,"expiration_date":"2035-01-05","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001599901-25-000017","document":"wk-form4_1736385384.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000017/wk-form4_1736385384.xml","form_type":"4"}},{"id":1306365,"issuer":{"id":11854,"kind":"organization","name":"Avidity Biosciences, Inc.","symbol":"RNAM"},"owners":[{"id":51578,"kind":"person","name":"Gallagher Kathleen P.","position":1,"cik":"0002048409","reported_name":"Gallagher Kathleen P.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Program Officer"}}],"security":"Common Stock","published_at":"2025-01-09T01:16:31.000Z","date":"2025-01-06","kind":"grant","planned":false,"acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's common stock. The RSUs shall vest in four equal installments on the first four anniversaries of January 6, 2025, subject to the Reporting Person's continuous service to the Issuer on each such vesting date."}],"balance_after":59965,"source":{"system":"sec-edgar","filing":"0001599901-25-000017","document":"wk-form4_1736385384.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1599901/000159990125000017/wk-form4_1736385384.xml","form_type":"4"}}]}