LEVIN ARTHUR A 4

What Happened Arthur A. Levin, a director of Avidity Biosciences, sold 1,758 shares of common stock on January 21, 2026, at $72.45 per share for gross proceeds of $127,367. The sale was reported on Form 4 filed January 23, 2026. This was a sale (not a purchase) and appears to be routine.

Key Details

• Transaction type: Sale (Code S) — open market or private sale on 2026-01-21
• Price and value: 1,758 shares × $72.45 = $127,367 (gross)
• Filing: Form 4 filed 2026-01-23 (filed two days after the transaction; appears timely)
• Shares owned after transaction: Not specified in the provided excerpt
• Footnote: Sale was a mandatory "sell-to-cover" to satisfy tax withholding on RSU vesting (RSUs vested Jan 20, 2026). The Reporting Person executed an instruction letter for automatic sale and cites the issuer’s sell-to-cover election; the transaction was intended to satisfy Rule 10b5-1 affirmative defense conditions and was not a discretionary trade.

Context This was a tax-withholding related sell-to-cover of RSU proceeds rather than a voluntary market-timing sale. Such transactions are common when restricted stock units vest and do not necessarily signal the insider’s view on the company’s outlook.