Constellium SE (CSTM) Form 144 lists 29,900-share proposed sale; recent PSU/RSU grants

Rhea-AI Filing Summary

Constellium SE files a Form 144 notice concerning proposed sales of Common Stock reported through broker J.P. Morgan Securities LLC. The filing lists 29,900 shares with an aggregate value of $773,606.65 and a reference number 135,069,771 dated 03/10/2026.

The excerpt also shows equity compensation activity on 03/09/2026: a PSU issuance of 59,276 shares and an RSU issuance of 15,119. The entries are presented as securities to be sold or issued on the dates shown.

Insights

Securities Counsel

Form 144 lists a broker-handled proposed sale and recent equity issuances.

The filing identifies J.P. Morgan Securities LLC and shows 29,900 Common Stock shares with an aggregate value of $773,606.65 dated 03/10/2026. It separately records equity compensation issuances of 59,276 PSUs and 15,119 RSUs on 03/09/2026.

Transaction timing, proceeds recipient, and whether the listed shares represent the full amount intended for sale are not specified in the excerpt; subsequent filings or broker confirmations would clarify settlement and cash-flow treatment.

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
Common Stock	J.P. Morgan Securities LLC 270 Park Ave 10th Floor New York NY 10017	29900	773606.65	135069771	03/10/2026	NYSE

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 *
Common Stock	03/09/2026	PSU Issuance	Constellium SE (issuer)			59276	03/09/2026	Equity Compensation
Common Stock	03/09/2026	RSU Issuance	Constellium SE (issuer)			15119	03/09/2026	Equity Compensation

* 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 Constellium SE's Form 144 (CSTM) disclose?

It discloses a proposed sale notice listing 29,900 shares and $773,606.65 as of 03/10/2026. The excerpt also records equity compensation issuances of 59,276 PSUs and 15,119 RSUs on 03/09/2026.

Who is the broker handling the proposed sale for CSTM?

The filing lists J.P. Morgan Securities LLC as the broker for the Common Stock entry. The excerpt pairs the broker name with the 29,900-share line and the 03/10/2026 timestamp in the provided content.

Are recent equity awards shown in the filing for CSTM?

Yes. The excerpt shows equity compensation on 03/09/2026: a PSU issuance of 59,276 shares and an RSU issuance of 15,119. These appear as issuance lines in the securities-to-be-sold section.

Does the Form 144 excerpt state who receives sale proceeds?

The excerpt does not specify who will receive proceeds. It lists share counts, an aggregate value, broker name, and dates but does not state the party that will receive cash from any sale.

Does the filing show the timing of the proposed sale for CSTM shares?

The filing includes a date of 03/10/2026 next to the Common Stock line and 03/09/2026 for issuances. Those dates are the timestamps shown in the excerpt for the reported entries.