Quantum-Si (QSI) affiliate notifies sale of 59,609 Class A shares via MS broker

Rhea-AI Filing Summary

Quantum-Si Incorporated filed a Form 144 reporting an intended sale of Class A Common Stock through Morgan Stanley Smith Barney LLC. The filing lists 59,609 shares tied to a Restricted Stock Unit Vesting event dated 03/15/2024. It also reports prior sales of 23,707 shares on 12/22/2025 as securities sold during the past three months. The broker listed is Morgan Stanley Smith Barney LLC with an address at 1 New York Plaza, New York, NY.

Insights

Securities Attorney

Form 144 notifies the market of an affiliate sale of Class A Common Stock.

The filing identifies 59,609 shares associated with a Restricted Stock Unit Vesting dated 03/15/2024, and shows a prior sale of 23,707 shares on 12/22/2025. These entries reflect a notice of proposed sale by an affiliate using Morgan Stanley Smith Barney LLC as broker.

Transaction timing, pricing, and whether the proposed sale completed are not provided in the excerpt; subsequent filings or broker reports would state executed sale details.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A Common Stock	Morgan Stanley Smith Barney LLC 1 New York Plaza 38th Floor New York NY 10004	23777	19906.40	196431273	03/20/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A Common Stock	03/15/2024	Restricted Stock Unit Vesting	Quantum-Si Incorporated			59609	03/15/2024	Equity compensation for services rendered

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Morgan Stanley Smith Barney LLC 1 New York Plaza 38th Floor New York NY 10004	Class A Common Stock	12/22/2025	23707	30250.13

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Quantum-Si's Form 144 (QSI) report?

It reports a proposed sale of Class A Common Stock by an affiliate. The filing lists 59,609 shares tied to RSU vesting on 03/15/2024 and a prior sale of 23,707 shares on 12/22/2025.

Who is the broker handling the reported sale in QSI's Form 144?

The broker named is Morgan Stanley Smith Barney LLC. The filing lists the broker address as 1 New York Plaza, New York, NY and identifies it as the intermediary for the proposed transactions.

Are the shares in the Form 144 newly vested or previously owned for QSI?

The filing ties 59,609 shares to a Restricted Stock Unit Vesting dated 03/15/2024, indicating the shares arose from equity compensation rather than an open-market purchase.

Does the excerpt show trade prices or completion of the proposed sale?

No; trade prices and confirmation of sale completion are not included in the excerpt. The filing lists quantities and dates but does not state execution prices or whether the proposed sale occurred.