Paula Dowdy - 05 Mar 2026 Form 4 Insider Report for Quantum-Si Inc (QSI)

Role: Director
Signature: /s/ Christian LaPointe, Ph.D., Attorney-in-Fact.
Issuer symbol: QSI
Transactions as of: 05 Mar 2026
Net transactions value: +$104,450
Form type: 4
Filing time: 09 Mar 2026, 06:01:13 UTC
Previous filing: 21 May 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Dowdy Paula	Director	C/O QUANTUM-SI INCORPORATED, 29 BUSINESS PARK DRIVE, BRANFORD	/s/ Christian LaPointe, Ph.D., Attorney-in-Fact.	09 Mar 2026	0002016312

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	QSI	Class A Common Stock	Purchase	$104,450	+109,890	+69%	$0.9505	269,107	05 Mar 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents the weighted average purchase price per share. The shares were purchased at prices ranging from $0.9051 to $0.9730 per share. Full information regarding the number of shares purchased 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.