Quanterix COO exercises RSUs, nets 160 new shares
Quanterix Corp Chief Operating Officer Michael Francis Miller exercised restricted stock units into common shares and had a portion withheld for taxes.
Rhea-AI Filing Summary
Quanterix Corp Chief Operating Officer Michael Francis Miller exercised restricted stock units into common shares and had a portion withheld for taxes. On March 31, 2026, he converted 229 restricted stock units, which convert to common stock on a one-for-one basis, into the same number of common shares at a stated price of $0.00 per share.
To cover tax obligations, 69 common shares were disposed of through tax-withholding transactions at $3.52 per share, leaving him with a net increase of 160 common shares. Following these transactions, Miller directly owned 31,431 shares of Quanterix common stock. The restricted stock units exercised were part of prior grants from April 7, 2022 and September 23, 2022 that vest over time.
Positive
- None.
Negative
- None.
Insider Trade Summary
229 shares exercised/converted
Exercise
6 txns
Insider
Miller Michael Francis
Role
Chief Operating Officer
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Unit | 99 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit | 130 | $0.00 | $0.00 |
| Exercise | Common Stock | 99 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 30 | $3.52 | $105.60 |
| Exercise | Common Stock | 130 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 39 | $3.52 | $137.28 |
Holdings After Transaction:
Restricted Stock Unit — 679 contracts (Direct);
Common Stock — 31,431 shares (Direct)
Footnotes (3)
- F1. Restricted stock units convert into common stock on a one-for-one basis.
- F2. On April 7, 2022, the reporting person was granted 4,518 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the last day of each month thereafter.
- F3. On September 23, 2022, the reporting person was granted 6,278 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the last day of each month thereafter.
Key Figures
RSUs exercised: 229 shares
Tax-withheld shares: 69 shares
Tax-withholding price: $3.52/share
+3 more
6 metrics
RSUs exercised
229 shares
Restricted stock units converted to common stock on March 31, 2026
Tax-withheld shares
69 shares
Common shares delivered for tax liabilities at $3.52 per share
Tax-withholding price
$3.52/share
Value applied to 30 and 39 common shares for tax withholding
Post-transaction holdings
31,431 shares
Common stock directly owned after March 31, 2026 transactions
April 7, 2022 RSU grant
4,518 units
Vests 25% after one year, then 36 equal monthly installments
September 23, 2022 RSU grant
6,278 units
Vests 25% after one year, then 36 equal monthly installments
Key Terms
Restricted Stock Unit, tax-withholding disposition, vesting
3 terms
Restricted Stock Unit financial
"Restricted stock units convert into common stock on a one-for-one basis."
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
tax-withholding disposition financial
"Payment of exercise price or tax liability by delivering securities."
A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.
vesting financial
"vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
FAQ
What insider transaction did Quanterix (QTRX) COO Michael Miller report?
Michael Miller exercised 229 restricted stock units into common shares and had 69 shares withheld for taxes. These transactions increased his direct Quanterix common stock holdings while satisfying associated tax obligations through share delivery at $3.52 per share.
Were Michael Miller’s Quanterix (QTRX) transactions open-market buys or routine vesting?
The transactions reflect routine equity compensation events, not open-market purchases. Miller exercised restricted stock units at a stated price of $0.00 per share, then disposed of 69 shares via tax-withholding to satisfy obligations, a common mechanism for handling taxes on vesting.
What are the vesting terms of the Quanterix (QTRX) RSU grants to the COO?
Miller received 4,518 restricted stock units on April 7, 2022 and 6,278 on September 23, 2022, each vesting 25% on the first anniversary. The remaining 75% of each grant vests in 36 equal monthly installments on the last day of each month thereafter.
AI-generated analysis. How Rhea-AI works. Not financial advice.
