Quanterix CTO exercises RSUs, shares withheld for tax
Quanterix Corp Chief Technology Officer Michael Francis Miller reported routine equity compensation activity.
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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 May 15, 2026, restricted stock units vested and were converted into 1,558 shares of Common Stock, while 467 shares were withheld at $2.75 per share to cover tax obligations. After these transactions, he directly owned 32,694 Common shares and 760 restricted stock units that may vest later.
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 | $2.75 | $68.75 |
| Exercise | Common Stock | 136 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 41 | $2.75 | $112.75 |
| Exercise | Common Stock | 135 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 41 | $2.75 | $112.75 |
| Exercise | Common Stock | 372 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 111 | $2.75 | $305.25 |
| Exercise | Common Stock | 834 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 249 | $2.75 | $684.75 |
Holdings After Transaction:
Restricted Stock Unit — 41,465 contracts (Direct);
Common Stock — 33,704 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 RSU vesting: 1,558 shares
Shares withheld for taxes: 467 shares
Post-transaction Common Stock holdings: 32,694 shares
+3 more
6 metrics
Shares acquired via RSU vesting
1,558 shares
Restricted stock units converted into Common Stock on May 15, 2026
Shares withheld for taxes
467 shares
Tax-withholding dispositions at $2.75 per share on May 15, 2026
Post-transaction Common Stock holdings
32,694 shares
Direct ownership after reported transactions
Remaining restricted stock units
760 RSUs
Derivative holdings after conversions reported on May 15, 2026
Tax-withholding price
$2.75 per share
Price used for F-code tax-withholding dispositions
Total derivative exercises
1,558 shares
Exercise or conversion of derivative securities per transactionSummary
Key Terms
restricted stock units, tax-withholding disposition, derivative security, vesting
4 terms
restricted stock units financial
"Restricted stock units convert into common stock on a one-for-one basis."
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
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 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
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What insider transactions did Quanterix (QTRX) report for Michael Francis Miller?
Quanterix reported that CTO Michael Francis Miller had restricted stock units vest into common shares and some shares withheld for taxes. These are compensation-related events, not open-market stock purchases or sales, and reflect ongoing equity grants rather than a change in investment stance.
What are Michael Francis Miller’s Quanterix (QTRX) holdings after these transactions?
Following the reported activity, Michael Francis Miller directly held 32,694 shares of Quanterix Common Stock and 760 restricted stock units. The remaining restricted stock units can convert into additional shares over time, subject to their specified vesting schedules and continued service conditions.
What do the restricted stock unit grants mean for Quanterix (QTRX) insiders?
The filing notes multiple restricted stock unit grants to the CTO, each vesting 25% after one year, then the rest in 36 monthly installments. This structure gradually delivers equity, aligning the executive’s compensation with Quanterix’s long-term performance and his continued employment at the company.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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