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Quanterix Corp Chief Technology Officer Michael Francis Miller reported compensation-related equity activity. On July 15, 2026 he converted 1,558 restricted stock units into common stock and had 467 shares withheld to satisfy tax obligations. After these non–open-market transactions, he directly owns 36,068 Quanterix common shares and continues to hold multiple unvested RSU awards.
Quanterix Corp granted its Chief Financial Officer, Jason F. Faessler, 141,820 restricted stock units on July 15, 2026. These RSUs convert into common stock and vest in four equal annual installments on each of the first four anniversaries of the grant date, contingent on his continued employment. Following this award, he reports direct beneficial ownership of 141,820
Quanterix Corp director Scott Mendel reported an equity compensation event. On July 8, 2026, he converted 8,073 restricted stock units into an equal number of common shares at no cost, reflecting routine vesting. After this conversion, he directly holds 24,056 common shares and 16,391 restricted stock units. The RSUs relate to a 24,464-unit grant made on July 8, 2025, which vests 33%, 33%, and 34% on the first three anniversaries of the grant date.
Quanterix Corp director Myla Lai-Goldman exercised restricted stock units into common shares. She converted 8,073 restricted stock units into 8,073 shares of Common Stock at a reported price of $0.00 per share, increasing her direct common stock holdings to 15,041 shares.
Following this transaction, she also holds 16,391 restricted stock units, which convert into common stock on a one-for-one basis. These units come from a prior grant of 24,464 restricted stock units awarded on July 8, 2025, vesting 33%, 33%, and 34% over three years.
Mendel Scott reported acquisition or exercise transactions in this Form 4 filing.
Quanterix Corp director Scott Mendel received a stock grant as board compensation. He was awarded 3,456 shares of Common Stock at a reference price of $4.34 per share, issued in lieu of cash fees for his service on the Board and its committees for the second quarter of 2026. Following this grant, he holds 16,837 common shares directly.
DONNELLY WILLIAM P reported acquisition or exercise transactions in this Form 4 filing.
Quanterix Corp director William P. Donnelly received 5,472 shares of Common Stock as a grant, valued at $4.34 per share. The award was granted in lieu of cash fees for his service on the company’s Board of Directors and its committees for the second quarter of 2026. After this compensation-related stock grant, he directly holds a total of 160,305 Quanterix common shares.
Quanterix Corp Chief Technology Officer Michael Francis Miller reported routine equity compensation activity involving restricted stock units. He exercised RSUs that converted into 130 shares of common stock on a one-for-one basis and a portion of the resulting shares, 39 in total, was disposed of to cover tax obligations. These transactions did not involve any open-market buying or selling and reflect standard mechanisms for settling equity awards and related taxes.
Quanterix Corp Chief Financial Officer Vandana Sriram reported routine equity compensation activity involving restricted stock units. On June 15, 2026, restricted stock units converted into 1,833 shares of common stock, and 548 shares were withheld at $3.10 per share to cover tax obligations.
These transactions reflect RSU vesting and related tax-withholding dispositions, not open-market trades. Following the transactions, Sriram directly owns 31,283 shares of Quanterix common stock. Footnotes state RSUs convert one-for-one into common stock and describe multi-year vesting schedules for prior RSU grants.
Quanterix Corp Chief Financial Officer Jason F. Faessler has filed an initial Form 3, which is the first statement of his beneficial ownership as an insider. The filing reports no transactions in Quanterix stock and no option exercises or other activity in this excerpt.
Quanterix Corp Chief Technology Officer Michael Francis Miller reported routine equity compensation activity on June 15, 2026. He exercised derivative awards for a total of 1,558 common shares and used 467 shares, valued at $3.10 each, to cover tax obligations. Following these transactions, he directly holds 33,851 shares of common stock, and restricted stock units continue to vest over time under previously granted awards.