Quantum-Si (QSI) GC LaPointe sells 11,959 shares to cover RSU taxes

Rhea-AI Filing Summary

Quantum-Si Inc’s General Counsel and Corporate Secretary, Christian LaPointe, reported two open-market sales totaling 11,959 shares of Class A Common Stock. According to the disclosure, these sales were mandatory sell-to-cover transactions for federal, state, and local tax withholding on vested restricted stock units. LaPointe continues to hold 1,198,017 shares directly after the transactions.

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

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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^*

LaPointe Christian

(Last) (First) (Middle)

C/O QUANTUM-SI INCORPORATED

29 BUSINESS PARK DRIVE

(Street)

BRANFORD CONNECTICUT 06405

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	GC & Corp. Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

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

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

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

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	03/20/2026		S(1)		5,849	D	$0.8483(2)	1,204,127	D
Class A Common Stock	03/23/2026		S(1)		6,110	D	$0.8266(3)	1,198,017	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 $0.8314 to $0.8718 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.

3. Represents the weighted average sales price per share. The shares sold at prices ranging from $0.7973 to $0.8525 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.	03/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Quantum-Si (QSI) insider Christian LaPointe report in this Form 4?

Christian LaPointe reported two sales totaling 11,959 Quantum-Si Class A shares. The filing explains these were mandatory sell-to-cover transactions for tax withholding triggered by vesting of previously granted restricted stock units, rather than discretionary open-market sales for portfolio or liquidity reasons.

What price range were the Quantum-Si (QSI) shares sold for in LaPointe’s Form 4?

The reported sales used weighted average prices, with shares sold between $0.8314 and $0.8718 per share in one transaction and between $0.7973 and $0.8525 in the other. Exact share counts at each individual price level are available from the company or regulators on request.

Why were Quantum-Si (QSI) shares sold in Christian LaPointe’s latest filing?

The sales were executed under a mandatory Quantum-Si sell-to-cover provision. This mechanism automatically sells shares to satisfy required federal, state, and local tax withholding obligations when restricted stock units vest, and the individual cannot change or opt out of this provision once granted.

How many Quantum-Si (QSI) shares does Christian LaPointe hold after these sales?

After completing the reported sell-to-cover transactions, Christian LaPointe directly holds 1,198,017 shares of Quantum-Si Class A Common Stock. This post-transaction balance indicates that the 11,959 shares sold for tax withholding represent a relatively small portion of his overall direct equity position.

Are LaPointe’s Quantum-Si (QSI) stock sales considered open-market transactions?

The transactions are coded as open-market sales of Class A Common Stock. However, the filing clarifies that they occurred solely under a mandatory sell-to-cover provision tied to RSU vesting, so they primarily reflect automatic tax withholding rather than a discretionary investment decision to reduce exposure.