<div id="readability-page-1"><div>McCarthy Teresa Officer of Avidity Biosciences Inc [RNA] filed a Form 4 on December 19, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:<div><table><tbody><tr><th>Date</th><th>Transaction</th><th>Shares</th><th>Price</th><th>Value</th></tr><tr><td>12/17/25</td><td>Exercise</td><td>39,000</td><td>$0.00</td><td>N/A</td></tr><tr><td>12/17/25</td><td>Surrender(1)</td><td>17,298</td><td>$71.87</td><td>$1,243,207</td></tr></tbody></table></div>Ending Holdings: 118,832 - Direct<ul><li>(1)</li><li>Surrender of shares back to company to pay option exercise cost and/or resulting tax liability.</li></ul>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data. </div></div>

Officer McCarthy of Avidity Biosciences Inc filed a Form 4 with the SEC, disclosing changes in ownership. On December 17, 2025, McCarthy exercised 39,000 shares and surrendered 17,298 shares at $71.87 each, valued at $1,243,207, to cover option exercise costs and tax liabilities. Ending holdings are 118,832 shares directly. The Washington Service offers insider trading analysis and data services.

Officer McCarthy Acquires 21,702 Of Avidity Biosciences Inc [RNA]