<div id="readability-page-1"><div>Toloue Masoud Chief Executive Officer of Quanterix Corp [QTRX] filed a Form 4 on December 3, 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>11/30/25</td><td>Exercise</td><td>761</td><td>$0.00</td><td>N/A</td></tr><tr><td>11/30/25</td><td>Surrender(1)</td><td>254</td><td>$7.26</td><td>$1,844</td></tr></tbody></table></div>Ending Holdings: 509,946 - 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>

QTRX

CEO Toloue Masoud of Quanterix Corp filed a Form 4 with the SEC, disclosing changes in ownership. On November 30, 2025, he exercised 761 shares and surrendered 254 shares at $7.26 each to cover option exercise costs and tax liabilities. His ending direct holdings are 509,946 shares.

CEO Toloue Acquires 507 Of Quanterix Corp [QTRX]