Constellium (NYSE: CSTM) Form 144 notes 31,132 PSU and 18,143 RSU issuances

Rhea-AI Filing Summary

Constellium SE submitted a Form 144 excerpt concerning Common Stock activity. The excerpt lists a PSU issuance of 31,132 shares and an RSU issuance of 18,143 shares, both dated 03/09/2026. The filing references J.P. Morgan Securities LLC and the NYSE; the form date shown is 03/10/2026.

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	4614	119378.63	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)			31132	03/09/2026	Equity Compensation
Common Stock	03/09/2026	RSU Issuance	Constellium SE (issuer)			18143	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 the Form 144 filing for CSTM show?

The filing lists Common Stock activity and broker details. It records a PSU issuance of 31,132 shares and an RSU issuance of 18,143 shares, both dated 03/09/2026, and references J.P. Morgan Securities LLC on 03/10/2026.

Were any sales amounts or proceeds disclosed in the CSTM excerpt?

No sale proceeds or transaction pricing are disclosed in the excerpt. The text lists issuance quantities and dates but does not state offer prices, sale amounts, or intended proceeds for any transactions.

Which broker and exchange are referenced in the filing?

The excerpt names J.P. Morgan Securities LLC located at 270 Park Ave and shows the security trading venue as the NYSE. Those entries appear alongside the Common Stock line items dated in March 2026.

Do the PSU and RSU counts represent shares sold under Rule 144?

The excerpt lists a PSU issuance of 31,132 and an RSU issuance of 18,143 dated 03/09/2026. It does not explicitly state whether these specific amounts are being sold under Rule 144; the text shows issuance and selling‑security fields.

What dates should readers note from the Form 144 excerpt?

Key dates in the excerpt are the issuance dates 03/09/2026 for the PSU and RSU entries and the form/broker line dated 03/10/2026. These are the only explicit dates shown in the provided text.