Quanterix CTO exercises RSUs, pays taxes in shares
Quanterix Corp Chief Technology Officer Michael Francis Miller reported routine equity compensation activity on June 15, 2026.
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Form Type
4
Rhea-AI Filing Summary
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.
Insider Trade Summary
1,558 shares exercised/converted
Exercise
15 txns
Insider
Miller Michael Francis
Role
Chief Technology Officer
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Unit | 81 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit | 136 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit | 135 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit | 372 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit | 834 | $0.00 | $0.00 |
| Exercise | Common Stock | 81 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 25 | $3.10 | $77.50 |
| Exercise | Common Stock | 136 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 41 | $3.10 | $127.10 |
| Exercise | Common Stock | 135 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 41 | $3.10 | $127.10 |
| Exercise | Common Stock | 372 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 111 | $3.10 | $344.10 |
| Exercise | Common Stock | 834 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 249 | $3.10 | $771.90 |
Holdings After Transaction:
Restricted Stock Unit — 39,907 contracts (Direct);
Common Stock — 34,886 shares (Direct)
Footnotes (6)
- F1. Restricted stock units convert into common stock on a one-for-one basis.
- F2. On February 6, 2023, the reporting person was granted 3,929 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 15th day of each month thereafter.
- F3. On March 15, 2023, the reporting person was granted 6,566 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 15th day of each month thereafter.
- F4. On February 2, 2024, the reporting person was granted 6,494 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 15th day of each month thereafter.
- F5. On May 21, 2024, the reporting person was granted 17,878 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 15th day of each month thereafter.
- F6. On February 4, 2025, the reporting person was granted 40,036 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 15th day of each month thereafter.
Key Figures
Shares acquired via exercises: 1,558 shares
Shares withheld for taxes: 467 shares at $3.10
Common shares held after transactions: 33,851 shares
+4 more
7 metrics
Shares acquired via exercises
1,558 shares
Common stock from derivative exercises on June 15, 2026
Shares withheld for taxes
467 shares at $3.10
Tax-withholding dispositions on June 15, 2026
Common shares held after transactions
33,851 shares
Direct ownership following June 15, 2026 activity
RSUs exercised (single grant example)
834 units
Restricted stock units converting one-for-one into common stock
Earliest RSU grant cited
3,929 units
Grant on February 6, 2023 with staged vesting
Largest RSU grant cited
40,036 units
Grant on February 4, 2025 with 25% cliff and monthly vesting
Remaining RSUs (smallest balance shown)
679 units
Restricted stock units outstanding after one grant’s conversions
Key Terms
Restricted stock unit, tax-withholding disposition, derivative security, vesting, +1 more
5 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.
derivative security financial
"Exercise or conversion of derivative security."
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
vesting financial
"Vesting 25% on the first anniversary, remaining 75% in 36 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.
exercise or conversion financial
"Exercise or conversion of derivative security."
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What insider transactions did Quanterix (QTRX) CTO Michael Miller report?
Michael Miller reported routine equity compensation activity. He exercised derivative awards for 1,558 common shares and used 467 shares to satisfy tax obligations at $3.10 per share, with no open-market buying or selling disclosed.
What derivative securities did the Quanterix (QTRX) CTO exercise in this filing?
The CTO exercised restricted stock units and related derivative awards that convert one-for-one into common stock. In total, 1,558 common shares were acquired through these exercises, reflecting vesting of previously granted restricted stock units on June 15, 2026.
How are Quanterix (QTRX) restricted stock units structured for the CTO?
Restricted stock units convert into common stock on a one-for-one basis. Grants made between February 2023 and February 2025 typically vest 25% on the first anniversary of grant, with the remaining 75% vesting in 36 equal monthly installments.
Does this Quanterix (QTRX) Form 4 indicate large insider selling activity?
The filing reflects routine tax-withholding and vesting, not large discretionary selling. Dispositions totaled 467 shares for taxes, while 1,558 shares were acquired through derivative exercises, leaving the CTO with 33,851 common shares directly held.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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