Form 4: Quanterix CEO Toloue Reports RSU Tax Withholding
Insider Transaction Report
Quanterix CEO Masoud Toloue reported the withholding of 1,242 common shares to cover tax obligations related to RSU vesting, effective September 15, 2025.
Summary
- Masoud Toloue, President & CEO and Director of Quanterix Corp (QTRX), reported a transaction involving common stock.
- On September 15, 2025, 1,242 shares of common stock were withheld by Quanterix Corporation.
- This withholding was solely to cover tax obligations upon the vesting of 3,722 Restricted Stock Units (RSUs).
- The deemed price for the withheld shares was $4.97 per share.
- Following this transaction, Masoud Toloue beneficially owns 513,192 shares, which includes 224,330 restricted stock units.
- The transaction was made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities of the issuer, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).
Sentiment
Score: 5
Explanation: The filing is a routine compliance disclosure of an insider transaction (tax withholding upon RSU vesting) and does not inherently carry positive or negative sentiment for the company's operational or financial performance.
Positives
- The underlying event is the vesting of Restricted Stock Units (RSUs), which represents a positive compensation event for the executive.
- The transaction demonstrates compliance with tax obligations related to equity compensation.
Negatives
- The withholding of shares reduces the executive's direct shareholding, though this is a standard procedure for tax purposes.
Future Outlook
The filing does not contain any forward-looking statements or guidance beyond the future transaction date of September 15, 2025, which is part of a pre-planned 10b5-1 arrangement.
Industry Context
This filing is a routine insider transaction disclosure and does not provide information relevant to broader industry trends or competitive analysis.
Corporate Governance
| Change Type | Description | Effective Date | Impact Assessment |
|---|---|---|---|
| Authorization for SEC Filings | A Power of Attorney, executed on June 8, 2021, grants specific individuals the authority to execute and file Forms 3, 4, and 5 on behalf of Masoud Toloue, ensuring compliance with Section 16(a) of the Securities Exchange Act of 1934. | June 8, 2021 | This authorization streamlines the process for insider trading compliance filings, ensuring timely and accurate disclosures. |
Stakeholder Impact
- Shareholders: Minimal direct impact as this is a routine compliance filing for an executive's equity compensation.
- Employees: No direct impact on the broader employee base, but it reflects standard practices for executive equity compensation.
Key Dates
| Date | Description |
|---|---|
| June 8, 2021 | Date of execution of the Power of Attorney authorizing designated individuals to file Forms 3, 4, and 5 on behalf of Masoud Toloue. |
| September 15, 2025 | Date of the reported transaction where shares were withheld for tax obligations upon RSU vesting. |
| September 17, 2025 | Date the Form 4 was signed by the attorney-in-fact. |
Keywords
Quanterix, QTRX, Masoud Toloue, SEC Form 4, Insider Transaction, RSU Vesting, Tax Withholding, Equity Compensation, 10b5-1 Plan
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