Welcome to our dedicated page for Quanterix SEC filings (Ticker: QTRX), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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Quanterix Corporation director David R. Walt received 1,215 shares of common stock on 01/02/2026, reported at a price of $0.00 per share. According to the filing, this stock was granted in lieu of cash fees for his service on the company’s Board of Directors and its committees for the fourth quarter of 2025.
After this grant, Walt beneficially owned 1,872,890 shares of Quanterix common stock, held directly. The transaction was reported on a Form 4 as an acquisition of non-derivative securities.
Quanterix Corp director Myla Lai-Goldman reported new equity awards in the company’s common stock. On January 2, 2026, she received 23,372 restricted stock units that will vest in full on January 2, 2027 under Quanterix’s Amended and Restated Non-Employee Director Compensation Policy, with each unit representing one share of common stock. The same day, she was also granted 1,944 shares of common stock issued in lieu of cash fees for serving on the board and its committees for the fourth quarter of 2025. Both awards were recorded at a price of $0.00 per share. After these transactions, she directly beneficially owned 54,804 shares of Quanterix common stock, which the filing notes include 47,836 restricted stock units.
Quanterix Corp director Scott Mendel reported new equity awards in the company’s stock. On 01/02/2026, he received 23,372 restricted stock units that will vest in full on January 2, 2027 under the Quanterix Corporation Amended and Restated Non-Employee Director Compensation Policy, with each unit representing one share of common stock. On the same date, he was also granted 1,944 shares of common stock issued in lieu of cash fees for his Board and committee service for the fourth quarter of 2025. Following these awards, he beneficially owned 56,053 shares of Quanterix common stock, including 47,836 restricted stock units, all reported as directly held.
Quanterix Corporation’s Chief Financial Officer reported a routine share adjustment related to equity compensation. On 12/15/2025, 229 shares of common stock were withheld by Quanterix at a price of $7.41 per share to cover tax obligations that arose when 777 restricted stock units (RSUs) vested. After this tax withholding, the officer beneficially owns 85,977 shares of Quanterix common stock, which includes 84,652 RSUs. This filing reflects administrative handling of taxes on vested stock awards rather than an open-market purchase or sale.
Quanterix Corp reported an insider equity transaction by its President & CEO and Director on 12/15/2025. The filing shows that 1,242 shares of common stock were withheld by Quanterix solely to cover tax obligations that arose when 3,722 restricted stock units (RSUs) vested. This is recorded as a disposition at a price of $7.41 per share for reporting purposes.
Following this tax withholding event, the reporting person beneficially owned 508,704 shares of Quanterix common stock, which includes 212,123 RSUs. The transaction was filed as a Form 4 for a single reporting person in their roles as both Director and President & CEO.
Quanterix Corp (QTRX) director files initial ownership report showing no holdings. A reporting person serving as a director of Quanterix Corporation has filed an initial Form 3 disclosing their beneficial ownership status as of 11/24/2025. The filing indicates that the director has no non-derivative securities beneficially held, with the amount reported as 0.00 shares held directly. The table for derivative securities is also blank, implying there are no options, warrants, or other derivative positions reported at this time. This is a routine disclosure required when an individual becomes an insider under U.S. securities rules.
Quanterix Corp (QTRX) reported a new equity award to one of its directors. On November 20, 2025, the director acquired 46,727 shares of common stock through a grant of restricted stock units (RSUs), reported as an acquisition in a Form 4 filing. Following this grant, the director beneficially owns 46,727 shares directly.
The RSUs vest in three equal installments. One-third of the total shares vest on each of November 20, 2026, November 20, 2027 and November 20, 2028, provided the director continues to provide service to Quanterix on each vesting date. This filing reflects routine director equity compensation rather than an open‑market purchase or sale.
Quanterix Corporation (QTRX) reported a new stock option grant to its Executive Chair and Director. On 11/20/2025, the insider acquired stock options to purchase 70,091 shares of Quanterix common stock at an exercise price of $5.91 per share. These options expire on 11/20/2035.
The options vest monthly over two years in 24 equal installments, as long as the Executive Chair continues providing service to Quanterix on each vesting date. Following this transaction, the reporting person beneficially owns 70,091 derivative securities directly.
Quanterix Corporation’s Chief Financial Officer reported a routine equity transaction on Form 4. On 11/15/2025, 229 shares of common stock were withheld by Quanterix solely to cover tax obligations when 777 restricted stock units vested. After this tax withholding, the reporting person beneficially owns 86,206 shares of Quanterix common stock, which includes 85,429 restricted stock units that may convert into shares over time.
Quanterix Corp (QTRX) reported an insider equity transaction by its President & CEO, who is also a director. On 11/15/2025, 1,242 shares of common stock were withheld under transaction code "F", meaning the shares were retained by the company solely to cover tax obligations triggered by the vesting of 2,480 restricted stock units (RSUs). Following this tax withholding, the reporting person beneficially owns 510,200 shares of Quanterix common stock, which includes 216,606 RSUs.