Every Form 4 that Quanterix (QTRX) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow QTRX and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full QTRX filings page.
Quanterix Corporation director Walt David R received 2,594 shares of common stock on 10/01/2025 as compensation in lieu of cash for third‑quarter 2025 board and committee fees, at the Nasdaq closing price of $5.54 per share. After the grant, the reporting person beneficially owns 1,871,675 shares, which include 7,435 restricted stock units. The Form 4 was signed by an attorney‑in‑fact on 10/03/2025. The filing discloses a single non‑derivative acquisition and explains the grant source and price; no options, dispositions, or additional derivative transactions are reported.
Sriram Vandana, Chief Financial Officer of Quanterix Corporation (QTRX), reported a sale of common stock on 09/15/2025. The filing shows 229 shares disposed at a price of $4.97 per share, marked with code F and explained as shares withheld by the company to cover tax obligations arising from the vesting of 777 restricted stock units (RSUs). After the transaction, the reporting person beneficially owned 86,971 shares, which the filing notes includes 71,670 RSUs. The form is signed by an attorney-in-fact on behalf of the reporting person and reflects a routine tax-withholding disposition rather than an open-market sale for cash.
Toloue Masoud, who serves as President & CEO and a director of Quanterix Corporation (QTRX), reported a sale of 1,242 shares of common stock at $4.97 per share. The filing states these shares were disposed (code F) and that 3,722 restricted stock units vested, with shares withheld solely to cover tax obligations related to that vesting. After the reported transaction Masoud is shown as beneficially owning 513,192 shares in total, which include 224,330 restricted stock units.
Quanterix Corp (QTRX) insider purchase by CFO: The filing shows Sriram Vandana, Chief Financial Officer, acquired 4,150 shares of Quanterix common stock on 09/12/2025 at $4.79 per share. After the transaction Vandana beneficially owned 87,200 shares in total, which the filing notes includes 72,447 restricted stock units. The Form 4 was submitted with a signature executed by an attorney-in-fact on 09/15/2025. The document records a single non-derivative purchase and lists no derivative transactions or additional amendments.