[Form 4] Quantum-Si Inc Insider Trading Activity

Rhea-AI Filing Summary

Christian LaPointe, Ph.D., General Counsel and Corporate Secretary of Quantum-Si Inc. (QSI), reported routine share dispositions related to tax withholding on vested restricted stock units.

On 09/22/2025 and 09/23/2025 LaPointe sold 5,364 shares on each date under a mandatory sell-to-cover provision, for total reported sales of 10,728 shares. The weighted average sales prices were $1.6826 (shares sold $1.64–$1.72) and $1.635 (shares sold $1.57–$1.79). Following the transactions, beneficial ownership is reported as 966,170 shares after the first sale and 960,806 shares after the second sale. The sales were reported on a Form 4 signed by an attorney-in-fact on 09/24/2025.

Positive

• Sales were mandatory sell-to-cover transactions for RSU tax withholding, not discretionary liquidations
• Reporting person retains substantial ownership (reported ~960,806 shares) after transactions

Negative

• 10,728 shares were sold across two days, reducing direct holdings from 966,170 to 960,806 shares
• Detailed per-trade price breakdown not included in the Form 4; only weighted averages and price ranges are provided

Insights

Corporate Governance Expert

TL;DR: Routine, non-discretionary sell-to-cover sales for tax withholding; not a governance red flag.

The filings show mandatory sell-to-cover dispositions tied to RSU vesting rather than voluntary open-market liquidation. The reporting person retains substantial direct ownership (~960,806 shares) after the transactions, indicating continued alignment with shareholders. The disclosures include weighted-average prices and price ranges; full per-trade price breakdown is not provided but is available on request to the SEC or issuer. Impact appears procedural and immaterial to corporate governance dynamics.

Securities Analyst

TL;DR: Small, tax-related insider sales; no evidence of change in investment stance or material liquidity event.

The Form 4 reports two equal sales of 5,364 shares each on consecutive days for tax withholding, with aggregate shares sold of 10,728 and modest weighted-average prices (~$1.64–$1.68). The remaining holdings exceed 960k shares, so the transactions represent a very small portion of reported ownership. From a market-impact perspective these sales are routine and unlikely to signal material insider-driven pressure on the stock.

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
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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).

1. Name and Address of Reporting Person^*

LaPointe Christian

(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)
	GC & Corp. Secretary

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2025

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	09/22/2025		S(1)		5,364	D	$1.6826(2)	966,170	D
Class A Common Stock	09/23/2025		S(1)		5,364	D	$1.635(3)	960,806	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 $1.64 to $1.72 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 $1.57 to $1.79 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.	09/24/2025
	** 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.

FAQ

What did Quantum-Si (QSI) insider Christian LaPointe sell on the Form 4?

The filing reports two sales of 5,364 shares on 09/22/2025 and 09/23/2025, totaling 10,728 shares sold under a mandatory sell-to-cover provision.

Why were the shares sold according to the Form 4?

The transactions were mandatory sell-to-cover sales to satisfy federal, state and local withholding taxes in connection with the vesting of previously granted restricted stock units.

What prices were reported for the sales?

Weighted average sale prices were $1.6826 (09/22/2025, range $1.64–$1.72) and $1.635 (09/23/2025, range $1.57–$1.79).

How many shares does LaPointe beneficially own after the reported transactions?

The Form 4 reports 966,170 shares following the first sale and 960,806 shares following the second sale.

When was the Form 4 signed and filed?

The Form 4 includes a signature by an attorney-in-fact, dated 09/24/2025.