Quantum-Si director receives 251K stock options

Quantum-Si Inc director Scott Mendel reported an equity award.

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

Rhea-AI Filing Summary

Quantum-Si Inc director Scott Mendel reported an equity award. He received a grant of 251,185 stock options to buy Class A Common Stock at an exercise price of $0.8539 per share, expiring on May 18, 2036.

The options cover 251,185 underlying Class A shares and vest on the date of Quantum-Si’s next regular annual stockholders meeting, subject to his continued service through that vesting date. After this filing, he directly holds 141,843 shares of Class A Common Stock and 251,185 options.

Insider Trade Summary

Grant/Award: 251,185 shares

Grant/Award 1 txn

Insider Mendel Scott

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 — 141,843 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

Options granted: 251,185 options Exercise price: $0.8539 per share Option expiration: May 18, 2036 +3 more

6 metrics

Options granted 251,185 options Grant of Stock Option (right to buy) on May 18, 2026

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

Option expiration May 18, 2036 Expiration date of granted stock options

Underlying shares 251,185 shares Class A Common Stock underlying the option grant

Common shares held 141,843 shares Class A Common Stock directly held after transactions

Options held after grant 251,185 options Total stock options following the reported award

Key Terms

Stock Option (right to buy), Class A Common Stock, vest on the date of the Issuer's next regular annual stockholders meeting, Grant, award, or other acquisition

4 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.

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

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

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

FAQ

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

What did Quantum-Si (QSI) director Scott Mendel report in this Form 4?

Scott Mendel reported receiving a grant of stock options from Quantum-Si. The award covers 251,185 options to buy Class A Common Stock, reflecting compensation rather than an open-market purchase or sale, and updates his reported equity position with the company.

How many Quantum-Si (QSI) stock options were granted and at what price?

Quantum-Si granted Scott Mendel 251,185 stock options. Each option has an exercise price of $0.8539 per share and is tied to one share of Class A Common Stock, giving him the right to buy shares at that fixed price if the options vest.

When do Scott Mendel’s new Quantum-Si (QSI) options vest?

The options vest on the date of Quantum-Si’s next regular annual stockholders meeting. Vesting is conditioned on Scott Mendel’s continued service with the company through that vesting date, meaning he must remain in his role until the meeting occurs.

What is the expiration date of Scott Mendel’s Quantum-Si (QSI) stock options?

The granted stock options expire on May 18, 2036. After that expiration date, any unexercised options will lapse and no longer give Scott Mendel the right to purchase Quantum-Si Class A Common Stock at the $0.8539 exercise price.

How many Quantum-Si (QSI) shares does Scott Mendel hold after this filing?

Following the reported transactions, Scott Mendel directly holds 141,843 shares of Quantum-Si Class A Common Stock. He also holds 251,185 stock options that, if vested and exercised, would allow him to purchase an equal number of additional Class A shares.

Is this Quantum-Si (QSI) Form 4 a market buy or sale of shares?

No, the key transaction is a grant of stock options coded as an acquisition (A). It represents an equity-based compensation award, not an open-market purchase or sale, and therefore does not reflect a discretionary trade in Quantum-Si shares.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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^*

Mendel Scott

(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								141,843	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)