Quanterix COO reports RSU vesting and tax withholding
Quanterix Corp’s Chief Operating Officer Michael Francis Miller reported routine equity compensation activity.
Rhea-AI Filing Summary
Quanterix Corp’s Chief Operating Officer Michael Francis Miller reported routine equity compensation activity. On March 15, 2026, multiple restricted stock unit awards converted into common stock, with derivative exercises totaling 1,558 shares according to the filing’s transaction summary.
To cover related tax obligations, 549 common shares were withheld at a price of $4.72 per share under code F transactions, which are tax-withholding dispositions rather than market sales. Following these transactions, Miller directly holds 31,271 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 | 29 | $4.72 | $136.88 |
| Exercise | Common Stock | 136 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 48 | $4.72 | $226.56 |
| Exercise | Common Stock | 135 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 48 | $4.72 | $226.56 |
| Exercise | Common Stock | 372 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 131 | $4.72 | $618.32 |
| Exercise | Common Stock | 834 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 293 | $4.72 | $1K |
Holdings After Transaction:
Restricted Stock Unit — 14,554 contracts (Direct);
Common Stock — 31,271 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.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What insider transactions did Quanterix (QTRX) report for its COO?
Quanterix reported that COO Michael Francis Miller had restricted stock units convert into common stock. On March 15, 2026, derivative exercises totaled 1,558 shares, with a portion of the resulting stock withheld to satisfy tax obligations, reflecting routine equity compensation activity.
Were the Quanterix (QTRX) COO’s transactions open-market buys or sales?
No open-market buys or sales were reported. The Form 4 lists code M derivative exercises converting restricted stock units to common stock and code F tax-withholding dispositions. Code F indicates shares delivered to cover tax liabilities, not discretionary market sales or purchases.
What do the restricted stock unit grants mean for Quanterix (QTRX) COO compensation?
The grants represent stock-based compensation that vests over time. Footnotes describe several RSU awards from 2023 to 2025, each vesting 25% after one year and the remaining 75% in 36 monthly installments, aligning Miller’s compensation with Quanterix’s long-term performance.
How do the RSU vesting schedules for Quanterix (QTRX) COO work?
Each referenced RSU grant vests 25% on the first anniversary of its grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th of each month. This creates a gradual, time-based release of Quanterix equity to the COO as part of compensation.
AI-generated analysis. How Rhea-AI works. Not financial advice.
