Form 4: Quanterix CEO's Stock Transaction for Tax Obligations

Quanterix Corp's President & CEO, Masoud Toloue, reported a disposition of 258 common shares to cover tax obligations related to RSU vesting.

Summary

• Masoud Toloue, President & CEO and Director of Quanterix Corp (QTRX), reported a transaction on December 31, 2025.
• 258 shares of common stock were disposed of at a price of $6.36 per share.
• This disposition was solely to cover tax obligations upon the vesting of 761 restricted stock units (RSUs).
• Following this transaction, Masoud Toloue beneficially owns 508,446 shares of Quanterix common stock, which includes 211,362 RSUs.

Sentiment

Score: 5

Explanation: Neutral. This is a routine, non-discretionary transaction for tax purposes upon RSU vesting, which does not inherently indicate positive or negative sentiment regarding the company's performance or future prospects.

Positives

• The transaction represents a routine, non-discretionary disposition of shares to cover tax obligations, not a discretionary sale by the insider.
• Masoud Toloue maintains substantial beneficial ownership of 508,446 shares, including 211,362 RSUs, indicating continued alignment with shareholder interests.

Negatives

• No direct negatives are identified as this is a standard tax-related transaction.

Future Outlook

This Form 4 filing does not contain any forward-looking statements or guidance regarding the company's future outlook.

Industry Context

This Form 4 filing details an individual insider transaction and does not provide broader industry context or trends.

Related Party Transactions

• Shares were withheld by Quanterix Corporation (the issuer) to cover tax obligations for its President & CEO, Masoud Toloue, upon RSU vesting. This is a standard related-party transaction for compensation and tax purposes.

Stakeholder Impact

• Shareholders: Minimal impact, as this is a routine administrative transaction for tax purposes and does not reflect a change in the executive's investment thesis or company fundamentals.
• Employees: No direct impact on the broader employee base is indicated by this filing.
• Customers, Suppliers, Creditors: No direct impact on these stakeholders is indicated.

Key Dates

Recommendation

This Form 4 reports a routine, non-discretionary disposition of shares to cover tax obligations upon RSU vesting. It does not reflect a change in the insider's investment thesis or outlook on the company. Therefore, it provides no new information to alter an existing investment recommendation, suggesting a 'hold' for current positions based solely on this filing.

Keywords

Quanterix, QTRX, Masoud Toloue, Form 4, SEC filing, insider transaction, stock disposition, RSU vesting, tax withholding, common stock