JONATHAN M. ROTHBERG - 16 Oct 2025 Form 4 Insider Report for Quantum-Si Inc (QSI)

Role
Director, 10%+ Owner
Signature
/s/ Jonathan M. Rothberg, Ph.D.
Issuer symbol
QSI
Transactions as of
16 Oct 2025
Net transactions value
-$80,112
Form type
4
Filing time
17 Oct 2025, 19:05:57 UTC
Previous filing
17 Jun 2025
Next filing
05 Nov 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/ Jonathan M. Rothberg, Ph.D. 17 Oct 2025 0001076352

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction QSI Class A Common Stock Sale $80,112 -26,095 -1.4% $3.07 1,904,866 16 Oct 2025 By NVR TR, LLC F1, F2, F3, F4
holding QSI Class A Common Stock 1,930,960 16 Oct 2025 By JNR TR, LLC F3, F4
holding QSI Class A Common Stock 1,930,960 16 Oct 2025 By GBR TR, LLC F3, F4
holding QSI Class A Common Stock 1,930,960 16 Oct 2025 By EJR TR, LLC F3, F4
holding QSI Class A Common Stock 1,250,000 16 Oct 2025 By JAR TR, LLC F4
holding QSI Class A Common Stock 2,568,443 16 Oct 2025 Direct
holding QSI Class A Common Stock 1,917,067 16 Oct 2025 By 23rd Century Capital LLC F4
holding QSI Class A Common Stock 273,422 16 Oct 2025 By Bonnie E Gould Rothberg MD F4
holding QSI Class B Common Stock 17,943,750 16 Oct 2025 By 4C Holdings I, LLC F4
holding QSI Class B Common Stock 1,993,750 16 Oct 2025 By 4C Holdings V, LLC F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 This sale was effected in connection with estate planning pursuant to a 10b5-1 trading plan established by Dr. Rothberg on September 13, 2024.
F2 Represents the weighted average sales price per share. The shares sold at prices ranging from $3.07 to $3.09 per share. Full information regarding the number of shares sold 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.
F3 Includes additional shares of Class A common stock previously held by 2012 JMR Trust Common, LLC that were distributed for estate planning purposes to NVR TR, LLC, JNR TR, LLC, GBR TR, LLC and EJR TR, LLC.
F4 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, GBR TR, LLC, EJR TR, LLC and JAR TR, LLC and. 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.