Form 4: Quantum-Si Chief Product Officer Sells Shares for Tax Obligations

Quantum-Si Inc.'s Chief Product Officer, John S. Vieceli, sold 21,923 shares of Class A Common Stock for $1.6139 per share to cover mandatory tax withholding related to vested restricted stock units.

Summary

• John S. Vieceli, Chief Product Officer of Quantum-Si Inc. (QSI), reported a sale of company stock.
• The transaction involved the disposition of 21,923 shares of Class A Common Stock.
• The shares were sold at a weighted average price of $1.6139 per share, with prices ranging from $1.55 to $1.68.
• The sale was executed on June 23, 2025, and was a mandatory 'sell-to-cover' provision for federal, state, and local withholding taxes associated with the vesting of previously granted restricted stock units.
• This transaction was made pursuant to a Rule 10b5-1(c) pre-planned contract, instruction, or written plan.
• Following the transaction, Mr. Vieceli beneficially owns 842,586 shares of Class A Common Stock.

Sentiment

Score: 5

Explanation: The sentiment is neutral. The sale is non-discretionary and for tax purposes, which is a common occurrence and does not reflect a negative outlook on the company by the insider. The pre-planned nature (10b5-1) adds transparency.

Positives

• The transaction was conducted under a Rule 10b5-1(c) plan, indicating it was a pre-scheduled, non-discretionary sale, which enhances transparency and reduces concerns about insider trading based on non-public information.

Negatives

• The sale resulted in a reduction of 21,923 shares in direct beneficial ownership by a key executive, slightly decreasing the alignment of management's direct equity interest with shareholders.

Future Outlook

The document does not contain any forward-looking statements or guidance regarding the company's future performance or strategic direction.

Management Comments

• The sale represents shares sold pursuant to a mandatory Quantum-Si sell-to-cover provision for required federal, state, and local withholding taxes in connection with the vesting of previously granted restricted stock units.
• The individual is not able to alter this mandatory sell-to-cover provision that is enacted at the grant date of the related restricted stock unit award.

Industry Context

This Form 4 filing is a routine compliance disclosure for an insider stock transaction. Such 'sell-to-cover' transactions are common across all industries when restricted stock units or other equity awards vest, as they are a standard mechanism for employees to meet tax obligations arising from compensation.

Stakeholder Impact

• Shareholders: A minor reduction in direct insider ownership, though the transaction is non-discretionary and for tax purposes, which is a common practice and generally not indicative of a change in management's confidence in the company.

Key Dates

Keywords

Quantum-Si Inc, QSI, SEC Form 4, Insider Trading, Stock Sale, Executive Compensation, Restricted Stock Units, Tax Withholding, Rule 10b5-1, Chief Product Officer