Ph.D. Jonathan M. Rothberg - 19 May 2025 Form 4 Insider Report for Quantum-Si Inc (QSI)

Role: Director, 10%+ Owner
Signature: /s/ Christian LaPointe, Ph.D., Attorney-in-Fact.
Issuer symbol: QSI
Transactions as of: 19 May 2025
Net transactions value: $0
Form type: 4
Filing time: 21 May 2025, 16:01:31 UTC
Previous filing: 31 Dec 2024
Next filing: 17 Jun 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
ROTHBERG JONATHAN M	Director, 10%+ Owner	C/O QUANTUM-SI INCORPORATED, 29 BUSINESS PARK DRIVE, BRANFORD	/s/ Christian LaPointe, Ph.D., Attorney-in-Fact.	21 May 2025	0001076352

Transactions Table

Type	Sym	Class	Shares After	Date	Ownership	Footnotes
holding	QSI	Class A Common Stock	2,723,841	19 May 2025	By 2012 JMR Trust Common, LLC	F1
holding	QSI	Class A Common Stock	1,250,000	19 May 2025	By NVR TR, LLC	F1
holding	QSI	Class A Common Stock	1,250,000	19 May 2025	By JNR TR, LLC	F1
holding	QSI	Class A Common Stock	1,250,000	19 May 2025	By GBR TR, LLC	F1
holding	QSI	Class A Common Stock	1,250,000	19 May 2025	By EJR TR, LLC	F1
holding	QSI	Class A Common Stock	2,568,443	19 May 2025	Direct
holding	QSI	Class A Common Stock	1,250,000	19 May 2025	By JAR TR, LLC	F1
holding	QSI	Class A Common Stock	1,917,067	19 May 2025	By 23rd Century Capital LLC	F1
holding	QSI	Class A Common Stock	273,422	19 May 2025	By Bonnie E Gould Rothberg MD	F1
holding	QSI	Class B Common Stock	17,943,750	19 May 2025	By 4C Holdings I, LLC	F1
holding	QSI	Class B Common Stock	1,993,750	19 May 2025	By 4C Holdings V, LLC	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	QSI	Stock Option (right to buy)	Award	$0	+126,095		$0.000000	126,095	19 May 2025	Class A Common Stock	126,095	$1.41	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Dr. Rothberg is the sole manager of 4C Holdings I, LLC, 4C Holdings V, LLC, 2012 JMR Trust Common, LLC, NVR TR, LLC, JNR TR, LLC, JAR TR, LLC, GBR TR, LLC and EJR TR, LLC. Dr. Rothberg is the spouse of Bonnie E. Gould Rothberg MD and Dr. Rothberg's son is the manager of 23rd Century Capital LLC. Dr. Rothberg disclaims beneficial ownership of the shares held by his spouse and 23rd Century Capital LLC.
F2	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.

Content

Dr. Rothberg is the sole manager of 4C Holdings I, LLC, 4C Holdings V, LLC, 2012 JMR Trust Common, LLC, NVR TR, LLC, JNR TR, LLC, JAR TR, LLC, GBR TR, LLC and EJR TR, LLC. Dr. Rothberg is the spouse of Bonnie E. Gould Rothberg MD and Dr. Rothberg's son is the manager of 23rd Century Capital LLC. Dr. Rothberg disclaims beneficial ownership of the shares held by his spouse and 23rd Century Capital LLC.

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.