Quantum-Si GC sells shares for tax withholding

Quantum-Si Inc general counsel and corporate secretary Christian LaPointe reported two small open-market sales of Class A common stock tied to tax withholding on vested restricted stock units.

Rhea-AI Filing Summary

Quantum-Si Inc general counsel and corporate secretary Christian LaPointe reported two small open-market sales of Class A common stock tied to tax withholding on vested restricted stock units. He sold 7,794 shares on June 22 at a weighted average price of $0.9574 per share and 7,794 shares on June 23 at a weighted average price of $0.8990 per share, for a total of 15,588 shares. The sales were executed under a mandatory sell-to-cover provision for federal, state and local tax withholding and were not discretionary. After these transactions, LaPointe directly holds 1,182,429 Quantum-Si shares.

Insider Trade Summary

Net Seller: 15,588 shares

Net Sell 2 txns

Insider LaPointe Christian

Role GC & Corp. Secretary

Sold 15,588 shs ($14K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	7,794	$0.899	$7K
Sale	Class A Common Stock	7,794	$0.9574	$7K

Holdings After Transaction: Class A Common Stock — 1,182,429 shares (Direct)

Footnotes (3)

1. F1. 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. F2. Represents the weighted average sales price per share. The shares sold at prices ranging from $0.9212 to $1.005 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. F3. Represents the weighted average sales price per share. The shares sold at prices ranging from $0.88 to $0.9291 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.

Key Figures

Shares sold June 22: 7,794 shares Price June 22: $0.9574/share Shares sold June 23: 7,794 shares +3 more

6 metrics

Shares sold June 22 7,794 shares Open-market sale at $0.9574 weighted average price

Price June 22 $0.9574/share Weighted average sale price; trades ranged $0.9212–$1.005

Shares sold June 23 7,794 shares Open-market sale at $0.8990 weighted average price

Price June 23 $0.8990/share Weighted average sale price; trades ranged $0.88–$0.9291

Total shares sold 15,588 shares Cumulative June sell-to-cover transactions

Shares held after 1,182,429 shares Direct Class A common stock held after June 23 sale

Key Terms

sell-to-cover, restricted stock units, weighted average sales price

3 terms

sell-to-cover financial

"Represents shares sold pursuant to a mandatory Quantum-Si sell-to-cover provision for required federal, state and local withholding taxes"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

restricted stock units financial

"withholding taxes in connection with the vesting of previously granted restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average sales price financial

"Represents the weighted average sales price per share. The shares sold at prices ranging from $0.9212 to $1.005 per share"

FAQ

What insider stock transactions did Quantum-Si (QSI) report for Christian LaPointe?

Quantum-Si reported that general counsel Christian LaPointe sold a total of 15,588 Class A shares in two June transactions. These sales were connected to tax withholding on vested restricted stock units under a mandatory sell-to-cover provision.

On what dates did Christian LaPointe sell Quantum-Si (QSI) shares and at what prices?

Christian LaPointe sold 7,794 shares on June 22 at a weighted average price of $0.9574, and another 7,794 shares on June 23 at a weighted average price of $0.8990 per share in open-market transactions.

Why did Quantum-Si (QSI) general counsel Christian LaPointe sell shares?

The sales were made under a mandatory sell-to-cover provision to satisfy required federal, state and local withholding taxes on the vesting of previously granted restricted stock units. The footnote explains LaPointe cannot alter this tax-related sell-to-cover mechanism.

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

Following the reported tax-related sales, Christian LaPointe directly holds 1,182,429 shares of Quantum-Si Class A common stock. This indicates the 15,588 shares sold represent a small portion of his overall direct ownership position disclosed in the filing.

Were Christian LaPointe’s Quantum-Si (QSI) share sales discretionary trades?

The filing indicates the sales were not discretionary. They occurred pursuant to a mandatory Quantum-Si sell-to-cover provision established at the grant date of the related restricted stock unit awards to cover required tax withholding obligations.

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Accepted by SEC EDGAR 06/24/2026 - 08:31 PM Learn about SEC filing dates

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^*

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)
06/22/2026

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	06/22/2026		S(1)		7,794	D	$0.9574(2)	1,190,223	D
Class A Common Stock	06/23/2026		S(1)		7,794	D	$0.899(3)	1,182,429	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 $0.9212 to $1.005 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 $0.88 to $0.9291 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	06/24/2026
	** 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)