Constellium SE (NYSE: CSTM) reports 3,200-share resale via J.P. Morgan

Rhea-AI Filing Summary

Constellium SE submitted a Rule 144 notice reporting the resale of 3,200 shares of Common Stock on 02/25/2026 through J.P. Morgan Securities LLC.

The filing lists the securities as issued under a PSU Issuance dated 05/21/2021 and shows prior reported Class A share sales by Stephane Corre during late 2025.

Insights

Securities Compliance Counsel

Routine Rule 144 resale filing; procedural disclosure only.

The notice documents a resale of 3,200 shares of Common Stock for Constellium SE dated 02/25/2026, routed via J.P. Morgan Securities LLC. The shares are linked to a PSU Issuance dated 05/21/2021.

Prior transactions by Stephane Corre in 11/2025–12/2025 are listed as recent sales. Timing and cash‑flow details are contained in transaction records; regulatory filing here serves disclosure rather than signaling corporate action.

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	3200	82260	137801779	02/25/2026	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	05/21/2021	PSU Issuance	Constellium SE (issuer)			3200	02/25/2026	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
Stephane Corre 14 TER Rue du docteur Teilhol Aubiere I0 63170	Class A Shares	11/25/2025	800	12960
Stephane Corre 14 TER Rue du docteur Teilhol Aubiere I0 63170	Class A Shares	11/26/2025	1000	16600
Stephane Corre 14 TER Rue du docteur Teilhol Aubiere I0 63170	Class A Shares	12/01/2025	1000	16900

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 filing for CSTM disclose?

It discloses a resale of 3,200 shares of Common Stock through J.P. Morgan Securities. The notice ties the shares to a PSU Issuance dated 05/21/2021 and is dated 02/25/2026.

Who is listed as the broker and intermediary on the Form 144?

The filing lists J.P. Morgan Securities LLC as the broker/intermediary for the resale. The broker address shown is 270 Park Ave, 10th Floor, New York, NY, with the resale dated 02/25/2026.

Does the filing show any prior sales by insiders for CSTM?

Yes; the filing lists prior Class A share sales by Stephane Corre in late 2025: 800, 1,000, and 1,000 shares on 11/25/2025, 11/26/2025, and 12/01/2025, respectively.

Are proceeds or use of proceeds disclosed in the Form 144 for CSTM?

The notice does not specify proceeds or their use; it records the resale quantity and intermediary. Transaction value and allocation details are not provided within the excerpted filing text.