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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1599901	Avidity Biosciences Inc.	RNA	Pharmaceutical Preparations (2834)	461336960

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1629383	Sarah Boyce	C/O Avidity Biosciences, Inc. 10578 Science Center Drive, Suite 125 San Diego CA 92121	President And Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2024-01-20	62,500	$0.00	67,209	No	4	A	Direct
Common Stock	Disposition	2024-01-22	5,092	$10.13	44,008	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	A	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Acquisiton	2024-01-20	300,000	$0.00	300,000	$10.16

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
300,000		2034-01-19	No	4	A	Direct

Footnotes

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 20, 2024, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.
Includes 4,709 shares previously acquired by the Reporting Person under the Avidity Biosciences, Inc. 2020 Employee Stock Purchase Plan.
Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of RSUs on January 20, 2024. 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.
1/48th of the total number of shares subject to the options shall vest on each monthly anniversary of January 20, 2024 (the "Vesting Commencement Date"), subject to the Reporting Person's continuous service to the Issuer on each such vesting date, so that the options shall be fully vested on the fourth anniversary of the Vesting Commencement Date.