Quanterix COO exercises 1,558 RSUs; 467 withheld
Quanterix Corp Chief Operating Officer Michael Francis Miller exercised restricted stock units into common stock and had shares withheld to cover taxes.
Rhea-AI Filing Summary
Quanterix Corp Chief Operating Officer Michael Francis Miller exercised restricted stock units into common stock and had shares withheld to cover taxes. On April 15, 2026, he acquired a total of 1,558 shares of common stock through multiple RSU conversions, all at a stated price of $0.00 per share.
To satisfy tax obligations related to these vesting events, 467 shares of common stock were disposed of at $3.60 per share in tax-withholding transactions. Following these transactions, Miller directly held 32,522 shares of Quanterix common stock.
Positive
- None.
Negative
- None.
Insider Trade Summary
1,558 shares exercised/converted
Exercise
15 txns
Insider
Miller Michael Francis
Role
Chief Operating 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 | $3.60 | $90.00 |
| Exercise | Common Stock | 136 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 41 | $3.60 | $147.60 |
| Exercise | Common Stock | 135 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 41 | $3.60 | $147.60 |
| Exercise | Common Stock | 372 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 111 | $3.60 | $399.60 |
| Exercise | Common Stock | 834 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 249 | $3.60 | $896.40 |
Holdings After Transaction:
Restricted Stock Unit — 43,023 contracts (Direct);
Common Stock — 32,522 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
RSU shares exercised: 1,558 shares
Tax-withheld shares: 467 shares
Tax-withholding price: $3.60 per share
+3 more
6 metrics
RSU shares exercised
1,558 shares
Total exercise or conversion shares reported in transaction summary
Tax-withheld shares
467 shares
Shares delivered to satisfy tax liability
Tax-withholding price
$3.60 per share
Price for F-code tax-withholding dispositions of common stock
Shares held after transactions
32,522 shares
Total direct common stock ownership following all reported entries
Individual RSU conversion lot
834 units
Largest single RSU tranche converted into common stock on April 15, 2026
RSU grant example
40,036 units
Grant on February 4, 2025 with 25% cliff and 36 monthly vesting installments
Key Terms
Restricted stock units, tax-withholding disposition, Exercise or conversion of derivative security, vesting, +1 more
5 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.
Exercise or conversion of derivative security financial
"transaction_code_description: Exercise or conversion of derivative security"
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.
one-for-one basis financial
"Restricted stock units convert into common stock on a one-for-one basis."
FAQ
What did Quanterix (QTRX) COO Michael Francis Miller report in this Form 4?
Michael Francis Miller reported multiple transactions where restricted stock units converted into Quanterix common stock and some shares were withheld for taxes. These events reflect equity compensation vesting, not open-market purchases or sales, and adjust his direct ownership position in the company.
How are the Quanterix (QTRX) RSU grants to the COO structured for vesting?
The RSU grants vest 25% on the first anniversary of the grant date, with the remaining 75% in 36 equal monthly installments on the 15th day of each following month. This schedule applies to multiple grants awarded between 2023 and 2025.
Are the Quanterix (QTRX) Form 4 transactions open-market buys or routine compensation events?
These transactions are routine compensation events, involving RSU conversions and tax-withholding dispositions. The filing shows no open-market purchases or sales; instead, it records equity awards vesting and associated tax payments using company stock.
AI-generated analysis. How Rhea-AI works. Not financial advice.
