McCarthy Teresa 4

What Happened
Teresa McCarthy, Chief Human Resources Officer of Avidity Biosciences (RNA), disposed of a total of 2,929 shares on Jan 21, 2026 in two open-market sales: 1,476 shares at $72.45 ($106,936) and 1,453 shares at $72.45 ($105,270), for combined proceeds of approximately $212,206. These were sales (S) reported on a Form 4.

Key Details

• Transaction dates and prices: Jan 21, 2026 — 1,476 shares @ $72.45 and 1,453 shares @ $72.45.
• Total shares sold: 2,929; total proceeds: ~$212,206.
• Purpose/footnote: Footnote F1 states these were mandatory "sell-to-cover" sales to satisfy tax withholding on RSUs that vested Jan 20, 2026; the issuer requires sell-to-cover under its equity plans. The reporting person executed an instruction letter intended to meet the affirmative defense conditions of Rule 10b5-1. This was not a discretionary trade by the insider.
• Shares owned after transaction: Not specified in the provided filing excerpt.
• Filing timeliness: Transaction reported on Form 4 filed Jan 23, 2026 for Jan 21 transactions — appears to be filed within the standard two-business-day window.

Context
Sell-to-cover transactions are routine administrative sales to cover tax obligations from vested restricted stock units and do not necessarily indicate any change in the insider's view of the company. The mention of an instruction letter and Rule 10b5-1 indicates the sales were pre-planned/automatic rather than ad hoc.