Avidity HR chief sells shares to cover taxes

Avidity Biosciences, Inc. executive Teresa McCarthy, Chief Human Resources Officer, reported a mandated tax-related share sale.

Rhea-AI Filing Summary

Avidity Biosciences, Inc. executive Teresa McCarthy, Chief Human Resources Officer, reported a mandated tax-related share sale. On January 7, 2026, she sold 1,965 shares of Avidity common stock at $72.23 per share. According to the disclosure, these shares were sold solely to cover tax withholding obligations arising from the vesting of restricted stock units (RSUs) on January 6, 2026.

The company’s equity incentive plan requires these tax obligations to be satisfied through a “sell-to-cover” transaction, and the filing states this was not a discretionary trade. McCarthy has an instruction letter in place for the automatic sale of such sell-to-cover shares, intended to satisfy the affirmative defense conditions of Rule 10b5-1. After this transaction, she directly beneficially owned 116,867 shares of Avidity common stock.

Insider Trade Summary

Net Seller: 1,965 shares

Net Sell 1 txn

Insider McCarthy Teresa

Role Chief Human Resources Officer

Sold 1,965 shs ($142K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,965	$72.23	$142K

Holdings After Transaction: Common Stock — 116,867 shares (Direct)

Footnotes (1)

1. F1. 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 6, 2026 and the sale of the resulting shares of common stock on January 7, 2026. 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

Who is the insider involved in this Avidity Biosciences (RNA) Form 4 filing?

The filing reports transactions by Teresa McCarthy, who serves as Chief Human Resources Officer of Avidity Biosciences, Inc..

What transaction did Teresa McCarthy report for Avidity Biosciences (RNA)?

On January 7, 2026, she reported the sale of 1,965 shares of Avidity common stock at a price of $72.23 per share.

Why were the 1,965 Avidity (RNA) shares sold by Teresa McCarthy?

The filing states the 1,965 shares were sold to cover tax withholding obligations from RSUs that vested on January 6, 2026, under a required “sell-to-cover” arrangement.

Was Teresa McCarthy’s Avidity (RNA) share sale a discretionary trade?

No. The disclosure explains the sale was mandated by the issuer’s equity incentive plan to fund tax withholding via a sell-to-cover transaction and does not represent a discretionary trade.

Is the Avidity (RNA) insider transaction linked to a Rule 10b5-1 plan?

Yes. The filing notes that McCarthy executed an instruction letter for automatic “sell-to-cover” sales intended to satisfy the affirmative defense conditions of Rule 10b5-1.

How many Avidity Biosciences (RNA) shares does Teresa McCarthy own after the reported sale?

Following the reported transaction, McCarthy beneficially owned 116,867 shares of Avidity Biosciences common stock, held directly.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 01/09/2026 - 05:13 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McCarthy Teresa

(Last) (First) (Middle)

C/O AVIDITY BIOSCIENCES, INC.

3020 CALLAN RD.

(Street)

SAN DIEGO CA 92121

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Avidity Biosciences, Inc. [ RNA ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Human Resources Officer

3. Date of Earliest Transaction (Month/Day/Year)
01/07/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/07/2026		S		1,965(1)	D	$72.23	116,867	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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 6, 2026 and the sale of the resulting shares of common stock on January 7, 2026. 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.

Remarks:

	/s/ John B. Moriarty, Jr., J.D., Attorney-in-Fact	01/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.