15,570-Share Insider Sale at Constellium (CSTM) and RSU/PSU Issuances

Rhea-AI Filing Summary

Constellium SE reports Rule 144 transactions in Common Stock: a sale of 15,570 shares on 02/20/2026 for $398,269.75 and a sale of 1,113 shares on 03/10/2026 for $28,796.79. The filing also lists RSU and PSU issuances of 6,912 and 14,592 shares respectively, dated 03/13/2026.

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	10000	250903.96	135069771	03/16/2026	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	RSU Issuance	Constellium SE (issuer)			6912	03/13/2026	Equity Compensation
Common Stock	03/09/2026	PSU Issuance	Constellium SE (issuer)			14592	03/13/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Marcus Becker Hirzlistrasse 17 Goldingen V8 8638	Common Stock	02/20/2026	15570	398269.75
Marcus Becker Hirzlistrasse 17 Goldingen V8 8638	Common Stock	03/10/2026	1113	28796.79

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 Rule 144 sales are disclosed for CSTM?

Two Rule 144 sales are disclosed. A sale of 15,570 shares on 02/20/2026 for $398,269.75 and a sale of 1,113 shares on 03/10/2026 for $28,796.79. These figures are listed verbatim in the filing.

Who is listed as the seller in the CSTM Form 144?

The filing names Marcus Becker. The entries show Marcus Becker with addresses associated and the two sales dated 02/20/2026 and 03/10/2026 along with the exact share counts and proceeds for each sale.

Does the filing show any equity awards for CSTM?

Yes. The filing lists equity awards issued by Constellium SE. It shows an RSU issuance of 6,912 shares and a PSU issuance of 14,592 shares, both dated 03/13/2026, labeled as equity compensation.

Are proceeds and prices shown for the disclosed sales?

Yes—the filing lists sale proceeds. The 15,570-share sale shows proceeds of $398,269.75 and the 1,113-share sale shows proceeds of $28,796.79, with each sale date specified in the filing.