Quanterix SEC Filings

Quanterix Corporation director Ivana Magovcevic-Liebisch received an equity grant of 23,372 restricted stock units (RSUs) of common stock on January 2, 2026. The RSUs were granted at a price of $0.00 per unit under the company’s Amended and Restated Non-Employee Director Compensation Policy.

The RSUs vest as to 100% of the shares on January 2, 2027, meaning they convert into common shares on that date if vesting conditions are met. Following this grant, she beneficially owns 43,607 RSUs, each representing the right to receive one share of Quanterix common stock.

Quanterix Corporation director Elliott Jeffrey Thomas reported a stock-based award from the company. On January 2, 2026, he received 23,372 shares of Quanterix common stock in the form of restricted stock units at a price of $0.00 per share under the Amended and Restated Non-Employee Director Compensation Policy.

These restricted stock units vest as to 100% of the shares on January 2, 2027, and each unit represents the right to receive one share of common stock. Following this grant, Thomas beneficially owned a total of 42,792 shares of Quanterix common stock, which includes 31,402 restricted stock units.

Quanterix Corporation announced a leadership transition, with President and CEO Masoud Toloue, Ph.D. entering a separation agreement under which his employment and Board service end effective January 19, 2026. He will receive severance consistent with a termination without cause, including accelerated vesting of equity awards that would have vested by April 30, 2026 and extended time to exercise vested stock options through December 31, 2026.

The Board appointed Everett Cunningham as the new President and CEO and as a Class II director effective January 19, 2026. His employment agreement provides a $750,000 annual base salary, an annual bonus target up to 100% of salary, a $600,000 sign-on cash payment subject to repayment conditions, and long-term equity awards of 1,070,000 time-based RSUs and 813,750 performance-based RSUs that vest upon multi-year service and stock price VWAP hurdles of $10, $15, and $20 per share, with additional provisions in the event of a change in control.

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.