Quantum-Si officer reports 14,516 shares for sale

The remarks attribute the transaction to Quantum-Si's election to require tax withholding through a sell-to-cover transaction, not a discretionary trade.

Rhea-AI Filing Summary

Quantum-Si Inc. officer Christian LaPointe reported a proposed sale of 14,516 shares of Class A common stock, with an aggregate market value of $10,994.80 and an approximate sale date of September 21, 2026. The reported broker is Morgan Stanley Smith Barney LLC.

The notice also records 60,424 shares acquired through restricted stock unit vesting on September 20, 2026. The remarks say Quantum-Si's election required a sell-to-cover transaction for tax withholding and that the sale was not a discretionary trade by LaPointe.

Key Figures

Shares reported for sale: 14,516 shares Aggregate market value: $10,994.80 Shares acquired: 60,424 shares +1 more

4 metrics

Shares reported for sale 14,516 shares Class A common stock; approximate sale date September 21, 2026

Aggregate market value $10,994.80 Shares reported for sale

Shares acquired 60,424 shares Restricted stock unit vesting on September 20, 2026

Shares outstanding 198,946,412 shares Number of shares outstanding listed in the securities information

Key Terms

Restricted Stock Unit Vesting, sell to cover transaction, tax withholding obligations

3 terms

Restricted Stock Unit Vesting financial

"Restricted Stock Unit Vesting"

sell to cover transaction financial

"satisfaction of tax withholding obligations through a sell to cover transaction"

tax withholding obligations financial

"Shares sold to cover tax withholding obligations"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many QSI shares did Christian LaPointe report for sale?

Christian LaPointe's notice lists 14,516 shares of Quantum-Si Class A common stock for sale, with an aggregate market value of $10,994.80 and an approximate sale date of September 21, 2026.

How many QSI shares vested before the reported sale?

The notice records 60,424 shares acquired through restricted stock unit vesting on September 20, 2026, as equity compensation for services rendered.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/23/2026 - 07:31 PM Accepted by SEC EDGAR 09/23/2026 - 07:29 PM Learn about SEC filing dates

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	0001856912
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Quantum-Si Inc
SEC File Number	001-39486
Address of Issuer	29 BUSINESS PARK DRIVE BRANFORD CONNECTICUT 06405
Phone	(203) 458-7100
Name of Person for Whose Account the Securities are To Be Sold	LaPointe Christian
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	Officer

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	14516	10994.80	198946412	09/21/2026	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	09/20/2026	Restricted Stock Unit Vesting	Quantum-Si Incorporated			60424	09/20/2026	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

Nothing to Report

144: Remarks and Signature

Remarks	Shares sold to cover tax withholding obligations in connection with the vesting of restricted stock units. The sale is mandated by the Issuers election to require the satisfaction of tax withholding obligations through a sell to cover transaction and does not represent a discretionary trade by the reporting person.
Date of Notice	09/23/2026
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	/s/ Christian LaPointe, Ph.D.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)