Quantum-Si (QSI) Form 4: Chief Product Officer executes sell-to-cover

Rhea-AI Filing Summary

Quantum-Si Incorporated (QSI) Form 4 – insider activity snapshot

Chief Product Officer John S. Vieceli reported one transaction dated 06/23/2025. He disposed of 21,923 Class A common shares at a weighted-average price of $1.6139 through the company’s mandatory “sell-to-cover” program that automatically sells shares to satisfy federal, state and local tax withholding triggered by the vesting of previously granted restricted stock units. The officer had no discretion over the timing or volume of the sale, which generated roughly $35,000 in gross proceeds based on the reported average price range of $1.55-$1.68.

After the sale, Vieceli maintains direct ownership of 842,586 shares, retaining more than 97 % of his pre-transaction stake. No derivative securities were acquired or disposed of, and no additional open-market activity is disclosed. Because the disposition was administrative and pre-arranged at grant, it is generally viewed as neutral from a sentiment standpoint, though investors often track any insider sales for potential signals of executive confidence.

Positive

• Executive retains 842,586 shares after the transaction, indicating continued long-term alignment with shareholders.

Negative

• Insider sale of 21,923 shares may be viewed negatively by some investors despite being mandatory for tax withholding.

Insights

Securities Analyst

TL;DR: Mandatory sell-to-cover; minor share count; executive retains large stake—market impact likely neutral.

The 21,923-share sale represents less than 3 % of John Vieceli’s holdings and was executed solely to cover tax obligations tied to RSU vesting. Such pre-programmed transactions carry little informational value about management’s outlook. Post-sale ownership of 842,586 shares suggests the CPO remains materially aligned with shareholders. No options or warrants were exercised or forfeited, and the filing shows no pattern of discretionary selling. Given QSI’s recent trading volume, the dollar value is immaterial and should not influence valuation models or liquidity assessments.

Corporate Governance Specialist

TL;DR: Administrative, Rule 10b5-1–style tax sale; governance risk unchanged.

The filing states the sale is mandated by Quantum-Si’s internal sell-to-cover policy, which mitigates selective disclosure and front-running concerns. Absence of discretionary trades reduces the possibility of insider-driven information asymmetry. The executive’s continued sizable holding upholds alignment incentives. From a governance lens, this event neither enhances nor deteriorates risk posture; therefore, I classify it as neutral.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Vieceli John S.

(Last) (First) (Middle)

C/O QUANTUM-SI INCORPORATED

29 BUSINESS PARK DRIVE

(Street)

BRANFORD CT 06405

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Quantum-Si Inc [ QSI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Product Officer

3. Date of Earliest Transaction (Month/Day/Year)
06/23/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	06/23/2025		S(1)		21,923	D	$1.6139(2)	842,586	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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. 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.

2. Represents the weighted average sales price per share. The shares sold at prices ranging from $1.55 to $1.68 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.

	/s/ Christian LaPointe, Ph.D., Attorney-in-Fact.	06/24/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

How many Quantum-Si (QSI) shares did John Vieceli sell?

21,923 Class A common shares were sold on 06/23/2025.

What price did the QSI shares sell for in the Form 4?

The weighted-average sale price was $1.6139 per share, within a $1.55-$1.68 range.

Why were the Quantum-Si shares sold?

The sale was a mandatory sell-to-cover to satisfy federal, state and local tax withholding on vested RSUs.

How many QSI shares does the executive still own after the sale?

John Vieceli directly holds 842,586 shares following the reported transaction.

Does this Form 4 indicate any derivative security activity?

No; the filing reports no acquisitions or dispositions of options, warrants or other derivatives.