Quanterix CTO logs RSU conversions, tax withholdings
Quanterix Corp’s Chief Technology Officer, Michael Francis Miller, reported multiple equity compensation transactions on August 15, 2026.
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Form Type
4
Rhea-AI Filing Summary
Quanterix Corp’s Chief Technology Officer, Michael Francis Miller, reported multiple equity compensation transactions on August 15, 2026. He exercised or converted restricted stock units into 1,558 shares of common stock, with the RSUs converting into common stock on a one-for-one basis. In related transactions, 467 common shares were delivered or withheld at $2.59 per share for payment of exercise price or tax liability. The mix of RSU conversions and share withholdings results in a largely administrative change in Miller’s reported holdings rather than a market purchase or sale.
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 | $2.59 | $64.75 |
| Exercise | Common Stock F1 | 136 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 41 | $2.59 | $106.19 |
| Exercise | Common Stock F1 | 135 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 41 | $2.59 | $106.19 |
| Exercise | Common Stock F1 | 372 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 111 | $2.59 | $287.49 |
| Exercise | Common Stock F1 | 834 | -- | -- |
| Exercise Price or Tax Liability | Common Stock | 249 | $2.59 | $644.91 |
Holdings After Transaction:
Restricted Stock Unit — 36,791 contracts (Direct);
Common Stock — 37,250 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 converted: 1,558 shares
Shares withheld for taxes/exercise: 467 shares
Withholding price per share: $2.59 per share
+3 more
6 metrics
RSU shares converted
1,558 shares
Total underlying shares from derivative exercises/conversions (code M) reported
Shares withheld for taxes/exercise
467 shares
Total shares delivered or withheld under code F for exercise price or tax liability
Withholding price per share
$2.59 per share
Price for common shares delivered or withheld in code F transactions
RSU grant Feb 6, 2023
3,929 RSUs
Grant vesting 25% after one year, 75% in 36 monthly installments
RSU grant Mar 15, 2023
6,566 RSUs
Grant vesting 25% after one year, 75% in 36 monthly installments
RSU grant Feb 4, 2025
40,036 RSUs
Grant vesting 25% after one year, 75% in 36 monthly installments
Key Terms
Restricted stock units, exercise or conversion of derivative security, Payment of exercise price or tax liability, 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.
exercise or conversion of derivative security financial
"transaction_code_description: Exercise or conversion of derivative security"
Payment of exercise price or tax liability financial
"transaction_code_description: Payment of exercise price or tax liability by delivering"
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 transactions did Quanterix (QTRX) CTO Michael Francis Miller report on August 15, 2026?
Michael Francis Miller exercised or converted restricted stock units into 1,558 shares of Quanterix common stock and had 467 shares delivered or withheld to cover exercise price or tax liability at $2.59 per share, reflecting equity compensation activity.
How many Quanterix (QTRX) RSUs did Michael Francis Miller convert to common stock?
He converted restricted stock units into 1,558 shares of Quanterix common stock. These RSUs stem from several grants between 2023 and 2025, each vesting over time, and they convert into common stock on a one-for-one basis as they vest.
What is the conversion ratio of Michael Francis Miller’s Quanterix (QTRX) restricted stock units?
His restricted stock units convert into Quanterix common stock on a one-for-one basis. Each vested RSU therefore results in the issuance of one share of common stock, as explicitly stated in the Form 4 footnotes.
Which Quanterix (QTRX) RSU grants are involved in Michael Francis Miller’s August 15, 2026 transactions?
The RSU exercises relate to grants of 3,929, 6,566, 6,494, 17,878, and 40,036 RSUs awarded between 2023 and 2025. Each grant vests 25% after one year, with the remaining 75% vesting in 36 equal monthly installments thereafter.
AI-generated analysis. How Rhea-AI works. Not financial advice.
