Quantum‑Si files Form 144 to sell 79,589 RSU shares

Quantum-Si Incorporated filed a Form 144 reporting an intended sale of 79,589 shares of Class A Common Stock tied to restricted stock unit vesting on 06/20/2026.

Rhea-AI Filing Summary

Quantum-Si Incorporated filed a Form 144 reporting an intended sale of 79,589 shares of Class A Common Stock tied to restricted stock unit vesting on 06/20/2026. The filing lists the transaction as equity compensation for services rendered and names Morgan Stanley Smith Barney LLC as the broker.

Insights

Securities Compliance Analyst

Routine Rule 144 sale filing linked to RSU vesting; procedural compliance noted.

Form 144 here records an intended disposition of 79,589 shares following Restricted Stock Unit Vesting on 06/20/2026. The filing identifies a broker-dealer, indicating a standard broker-assisted sale route.

Timing and exact sale proceeds are not provided in this excerpt; subsequent transaction details will appear in trade confirmations or Form 4 if an immediate sale occurs.

Key Figures

Shares to be sold: 79,589 shares

1 metrics

Shares to be sold 79,589 shares Restricted Stock Unit Vesting on <date>06/20/2026</date>

Key Terms

Restricted Stock Unit Vesting, Form 144, Equity compensation

3 terms

Restricted Stock Unit Vesting financial

"Restricted Stock Unit Vesting | Quantum-Si Incorporated"

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Equity compensation financial

"Equity compensation for services rendered"

Equity compensation is pay given to employees, executives or contractors in the form of company ownership—such as stock, stock options or restricted shares—rather than just cash. It matters to investors because it can align workers' incentives with shareholders (like paying someone in slices of the same pie they help grow), but it also increases the number of shares outstanding and company expenses, affecting ownership percentages and earnings per share.

FAQ

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

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

It reports an intended sale of 79,589 shares of Class A Common Stock tied to RSU vesting on 06/20/2026. The broker is listed as Morgan Stanley Smith Barney LLC and the disposition is labeled as equity compensation for services rendered.

Does the Form 144 confirm the shares were already sold?

No. The Form 144 indicates an intended sale related to RSU vesting on 06/20/2026. It does not provide confirmed trade execution details or sale proceeds; execution would be reported separately if required.

How many shares are covered by the filing for QSI?

The filing covers 79,589 shares of Class A Common Stock. These shares are specifically associated with a restricted stock unit vesting event dated 06/20/2026 and described as compensation for services rendered.

Who is handling the sale according to the filing?

The filing names Morgan Stanley Smith Barney LLC at 1 New York Plaza as the listed broker-dealer for the transaction. The document does not disclose sale price or proceeds in the provided excerpt.

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

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Accepted by SEC EDGAR 06/24/2026 - 08:02 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	0002032947
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	Vieceli John S.
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	30223	28052.99	197822663	06/22/2026	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	06/20/2026	Restricted Stock Unit Vesting	Quantum-Si Incorporated			79589	06/20/2026	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	06/24/2026
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., Attorney-in-Fact
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)