Miller Michael Francis 4

What Happened

• Michael Francis Miller, Chief Operating Officer of Quanterix (QTRX), had restricted stock units (RSUs) vest/convert on March 15, 2026. A total of 1,558 RSUs converted into common shares.
• Of those, 549 shares were withheld to satisfy tax withholding at $4.72 per share (total tax withholding reported $2,592), leaving 1,009 net shares issued to Miller.
• This was a routine vesting/settlement event (conversion of RSUs), not an open-market purchase or sale.

Key Details

• Transaction date: March 15, 2026; Form 4 filed March 17, 2026 (appears timely—filed two days after the transactions).
• Reported entries: several M-code conversions (derivative conversions of RSUs) totaling 1,558 shares acquired and matching derivative cancellations; F-code disposals (tax withholding) totaling 549 shares at $4.72/share, $2,592 total.
• Net new shares received by Miller: 1,009 shares (1,558 converted − 549 withheld).
• Shares owned after the transaction: not specified in the information provided on this filing.
• Relevant footnotes: the converted RSUs came from multiple grants (see grant dates and sizes in the filing): Feb 6, 2023 (3,929 RSUs), Mar 15, 2023 (6,566 RSUs), Feb 2, 2024 (6,494 RSUs), May 21, 2024 (17,878 RSUs), Feb 4, 2025 (40,036 RSUs). Each award vests 25% at the first anniversary, then monthly installments on the 15th thereafter.

Context

• These entries reflect routine RSU vesting and conversion into common stock. The F-code "disposals" are withholding of shares to cover tax obligations (a common practice), not open-market sales that would signal a cash exit.
• Transaction codes: M = exercise/conversion of derivative (RSU conversion); F = payment of exercise price or tax liability (share withholding).
• For retail investors: vesting conversions are standard compensation events and do not by themselves imply a change in the insider’s view of the company.