Quantum‑Si (NASDAQ: QSI) Form 144: 60,425 RSUs vest, resale listed

Rhea-AI Filing Summary

Quantum-Si Incorporated reported a proposed sale of Class A Common Stock via a Form 144 filing. The filing lists Restricted Stock Unit vesting on 06/20/2026 totaling 60,425 shares and notes broker Morgan Stanley Smith Barney LLC. Timing and cash‑flow treatment are those shown in the filing.

Insights

Compensation & Equity Analyst

RSU vesting led to a Form 144 notice for proposed resale of shares.

The filing lists 60,425 shares attributable to Restricted Stock Unit vesting on 06/20/2026. This indicates compensation-related issuance that became eligible for resale and was reported through a broker.

Impact appears routine for equity compensation; subsequent trading activity and proceeds depend on holder decisions and any resale timing disclosed in later filings.

Key Figures

RSUs vested: 60,425 shares Shares outstanding (listed): 197,822,663 Broker: Morgan Stanley Smith Barney LLC +2 more

5 metrics

RSUs vested 60,425 shares Restricted Stock Unit Vesting on <date>06/20/2026</date>

Shares outstanding (listed) 197,822,663 Securities information adjacent to <date>06/22/2026</date>

Broker Morgan Stanley Smith Barney LLC Named intermediary at 1 New York Plaza in the filing

Form type Form 144 Notice of proposed sale of securities

Exchange NASDAQ Exchange listed in the securities information section

Key Terms

Restricted Stock Unit (RSU) Vesting, Form 144, Morgan Stanley Smith Barney LLC

3 terms

Restricted Stock Unit (RSU) Vesting financial

"Restricted Stock Unit Vesting | Quantum-Si Incorporated | 60,425 | 06/20/2026"

Form 144 regulatory

"Filer Information | 144: Filer Information ... 144: Securities To Be Sold"

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.

Morgan Stanley Smith Barney LLC other

"Morgan Stanley Smith Barney LLC 1 New York Plaza 38th Floor New York NY 10004"

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Available on EDGAR 06/24/2026 - 08:05 PM Accepted by SEC EDGAR 06/24/2026 - 08:05 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
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

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	15588	14468.78	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			60425	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

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 the QSI Form 144 filing report?

It reports a proposed resale of Class A Common Stock tied to RSU vesting. The filing cites 60,425 shares from Restricted Stock Unit vesting on 06/20/2026, with sales to be handled through Morgan Stanley Smith Barney LLC.

Who is the broker handling the planned resale in QSI's Form 144?

The filing names Morgan Stanley Smith Barney LLC at 1 New York Plaza, New York. That broker is listed as the intermediary for the securities sale reported on the Form 144 accompanying the RSU vesting on 06/20/2026.

How many shares vested and are listed for potential sale in the filing?

The filing lists 60,425 shares associated with Restricted Stock Unit vesting on 06/20/2026. These vested shares are the quantity reported in the Form 144 as eligible for resale by the holder.

Does the filing state shares outstanding for QSI?

The filing includes the figure 197,822,663 alongside a 06/22/2026 entry. This number is shown in the securities information section of the filing and is presented with that date in the provided excerpt.