Quanterix CTO reports RSU vesting and tax withholding
Quanterix Corp Chief Technology Officer Michael Francis Miller reported compensation-related equity activity.
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Form Type
4
Rhea-AI Filing Summary
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.
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 F2 | 81 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit F3 | 136 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit F4 | 135 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit F5 | 372 | $0.00 | $0.00 |
| Exercise | Restricted Stock Unit F6 | 834 | $0.00 | $0.00 |
| Exercise | Common Stock F1 | 81 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 25 | $4.24 | $106.00 |
| Exercise | Common Stock F1 | 136 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 41 | $4.24 | $173.84 |
| Exercise | Common Stock F1 | 135 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 41 | $4.24 | $173.84 |
| Exercise | Common Stock F1 | 372 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 111 | $4.24 | $470.64 |
| Exercise | Common Stock F1 | 834 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 249 | $4.24 | $1K |
Holdings After Transaction:
Restricted Stock Unit — 38,349 contracts (Direct);
Common Stock — 36,068 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
RSUs converted to common stock: 1,558 shares
Shares withheld for taxes: 467 shares
Direct common shares after transactions: 35,058 shares
+2 more
5 metrics
RSUs converted to common stock
1,558 shares
Restricted stock units exercised into common stock on July 15, 2026
Shares withheld for taxes
467 shares
Tax-withholding dispositions related to RSU vesting on July 15, 2026
Direct common shares after transactions
35,058 shares
Direct ownership of Quanterix common stock following July 15, 2026 transactions
Tax withholding share price
$4.24 per share
Price used for tax-withholding dispositions of common stock on July 15, 2026
Largest remaining RSU award
25,857 units
Restricted stock units remaining outstanding under one grant after July 15, 2026
Key Terms
Restricted Stock Unit, tax-withholding disposition, derivative security, vesting
4 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 of the grant date, with the remaining 75%""
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 equity transactions did Quanterix (QTRX) report for its CTO?
Quanterix reported that CTO Michael Francis Miller had 1,558 restricted stock units convert into common stock on July 15, 2026. In connection with this vesting, 467 shares were delivered to cover tax obligations, and the remaining shares increased his direct common stock holdings.
Were the Quanterix (QTRX) CTO’s Form 4 transactions open-market buys or sells?
The reported transactions were not open-market trades. They consist of RSU conversions into common stock (code M) and tax-withholding dispositions (code F), where 467 shares were delivered to satisfy tax liabilities tied to equity vesting.
How many restricted stock units did the Quanterix (QTRX) CTO have vest?
On July 15, 2026, Michael Francis Miller had 1,558 restricted stock units convert into Quanterix common stock. The RSUs convert on a one-for-one basis, so each vested unit produced one common share, subject to shares withheld for associated tax obligations.
Does the Quanterix (QTRX) CTO still hold unvested restricted stock units?
Yes. After the reported vesting events, Michael Francis Miller continues to hold several unvested RSU awards, including one grant with 25,857 restricted stock units remaining outstanding, which are scheduled to vest over time according to their original grant terms.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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