Quantum-Si director granted 251K stock options

Quantum-Si Inc director Ruth A. Fattori reported an equity compensation grant in the form of stock options.

Accepted by SEC EDGAR 05/20/2026 - 04:05 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Quantum-Si Inc director Ruth A. Fattori reported an equity compensation grant in the form of stock options. She received options covering 251,185 shares of Class A Common Stock at an exercise price of $0.8539 per share, expiring on May 18, 2036.

The options relate to 251,185 underlying Class A shares and were granted as a “right to buy.” According to the footnote, the shares underlying this option vest on the date of Quantum-Si’s next regular annual stockholders meeting, subject to her continued service. Following the reported transactions, she directly holds 170,512 shares of Class A Common Stock.

Insider Trade Summary

Grant/Award: 251,185 shares

Grant/Award 1 txn

Insider Fattori Ruth A

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	251,185	$0.00	$0.00
Holding	Class A Common Stock	--	--	--

Holdings After Transaction: Stock Option (right to buy) — 251,185 contracts (Direct); Class A Common Stock — 170,512 shares (Direct)

Holdings Before and After: Stock Option (right to buy), 0 to 251,185 contracts (Direct)

Footnotes (1)

1. F1. The shares underlying this option vest on the date of the Issuer's next regular annual stockholders meeting, subject to continued service through the applicable vesting date.

Key Figures

Stock options granted: 251,185 options Exercise price: $0.8539 per share Option expiration: May 18, 2036 +2 more

5 metrics

Stock options granted 251,185 options Grant to director Ruth A. Fattori on May 18, 2026

Exercise price $0.8539 per share Exercise price for granted stock options

Option expiration May 18, 2036 Expiration date of stock option grant

Underlying shares 251,185 shares Class A Common Stock underlying the options

Shares held after 170,512 shares Class A Common Stock directly held following transactions

Key Terms

Stock Option (right to buy), Class A Common Stock, exercise price, vest, +1 more

5 terms

Stock Option (right to buy) financial

"security_title: "Stock Option (right to buy)""

Class A Common Stock financial

"underlying_security_title: "Class A Common Stock""

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

exercise price financial

"conversion_or_exercise_price: "0.8539""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vest financial

"The shares underlying this option vest on the date of the Issuer's next regular annual stockholders meeting"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

annual stockholders meeting financial

"on the date of the Issuer's next regular annual stockholders meeting"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Quantum-Si (QSI) director Ruth A. Fattori report in this Form 4?

Ruth A. Fattori reported receiving a grant of stock options for 251,185 shares of Quantum-Si Class A Common Stock. These options are an equity compensation award and give her the right to buy shares at a fixed exercise price if they vest and are exercised.

How large is the stock option grant reported by Quantum-Si (QSI) director Ruth A. Fattori?

The grant covers 251,185 stock options tied to Quantum-Si Class A Common Stock. Each option represents the right to purchase one share, making this a sizable equity award that can increase her ownership if she later exercises the options.

What is the exercise price and expiration date of Ruth A. Fattori’s Quantum-Si (QSI) options?

The options have an exercise price of $0.8539 per share and expire on May 18, 2036. This means she can choose to buy shares at that fixed price any time before expiration, subject to the vesting conditions being satisfied.

When do Ruth A. Fattori’s Quantum-Si (QSI) stock options vest?

According to the footnote, the shares underlying this option vest on the date of Quantum-Si’s next regular annual stockholders meeting. Vesting is contingent on her continued service with the company through that annual meeting date.

How many Quantum-Si (QSI) shares does Ruth A. Fattori hold after the reported transactions?

After the reported transactions, Ruth A. Fattori directly holds 170,512 shares of Quantum-Si Class A Common Stock. This holding figure is separate from the 251,185 stock options, which only convert into shares if they vest and are exercised.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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^*

Fattori Ruth A

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

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								170,512	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
Stock Option (right to buy)	$0.8539	05/18/2026		A		251,185		(1)	05/18/2036	Class A Common Stock	251,185	$0	251,185	D

Explanation of Responses:

1. The shares underlying this option vest on the date of the Issuer's next regular annual stockholders meeting, subject to continued service through the applicable vesting date.

	/s/ Christian LaPointe, Ph.D., Attorney-in-Fact.	05/20/2026
	** 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)