Director Paula Dowdy receives 251,185 options at Quantum-Si (QSI)

Rhea-AI Filing Summary

Quantum-Si Inc director Paula Dowdy reported a new stock option grant. She received a Stock Option (right to buy) covering 251,185 shares of Class A Common Stock at a conversion or exercise price of $0.8539 per share, expiring on May 18, 2036.

The filing states that the shares underlying this option vest on the date of Quantum-Si’s next regular annual stockholders meeting, subject to her continued service through that vesting date. After the reported transactions, she directly beneficially owns 269,107 shares of Class A Common Stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Dowdy Paula

Role null

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

Holdings After Transaction: Stock Option (right to buy) — 251,185 shares (Direct, null); Class A Common Stock — 269,107 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Option grant size: 251,185 shares Exercise price: $0.8539 per share Option expiration: May 18, 2036 +2 more

5 metrics

Option grant size 251,185 shares Stock Option (right to buy) underlying Class A Common Stock

Exercise price $0.8539 per share Conversion or exercise price of the stock option grant

Option expiration May 18, 2036 Expiration date of the granted stock option

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

Shares owned after 269,107 shares Class A Common Stock directly beneficially owned following the transactions

Key Terms

Stock Option (right to buy), Class A Common Stock, Grant, award, or other acquisition, conversion or exercise price, +1 more

5 terms

Stock Option (right to buy) financial

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

Class A Common Stock financial

"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.

Grant, award, or other acquisition financial

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

conversion or exercise price financial

"conversion_or_exercise_price: "0.8539""

annual stockholders meeting financial

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

Form 4 Insider Transactions: What Each Field Means →

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^*

Dowdy Paula

(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								269,107	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)

FAQ

What did Quantum-Si (QSI) director Paula Dowdy report in this Form 4?

Director Paula Dowdy reported a new stock option grant. She received an option over 251,185 shares of Quantum-Si Class A Common Stock at a conversion or exercise price of $0.8539 per share, expiring May 18, 2036, as part of her compensation.

How many Quantum-Si (QSI) shares are covered by Paula Dowdy’s new option?

The new stock option covers 251,185 shares of Quantum-Si Class A Common Stock. These underlying shares will become exercisable only after vesting, which is scheduled for the company’s next regular annual stockholders meeting, subject to her continued service through that date.

When do Paula Dowdy’s Quantum-Si (QSI) stock options vest?

The shares underlying the option vest on the date of Quantum-Si’s next regular annual stockholders meeting. Vesting is conditioned on Paula Dowdy continuing to serve through that vesting date, aligning the award with ongoing board service and governance responsibilities.

What is the exercise price and expiration date of Paula Dowdy’s Quantum-Si (QSI) options?

The option has a conversion or exercise price of $0.8539 per share and expires on May 18, 2036. This gives her the right, after vesting, to buy Quantum-Si Class A Common Stock at that fixed price until the stated expiration date.

How many Quantum-Si (QSI) shares does Paula Dowdy own after this filing?

After the reported transactions, Paula Dowdy directly beneficially owns 269,107 shares of Quantum-Si Class A Common Stock. This ownership figure is separate from the newly granted stock option, which represents additional potential future share ownership upon exercise.

Does this Quantum-Si (QSI) Form 4 show any stock sales or open-market purchases?

The Form 4 does not report any open-market purchases or sales. It shows a stock option grant coded as a “Grant, award, or other acquisition” and a holdings entry, indicating a compensation-related award rather than trading in Quantum-Si shares.