Constellium (NYSE: CSTM) Form 144 — 80,000 Class A shares listed

Rhea-AI Filing Summary

Constellium SE submitted a Form 144 notice concerning the proposed sale of 80,000 Class A common shares, listed with J.P. Morgan Securities LLC as the broker-dealer on 03/04/2026. The filing also lists multiple equity-compensation lots (RSUs and PSUs) with discrete share counts dated between 05/25/2021 and 03/10/2025, including examples of 11,246 (RSU, 05/25/2021) and 6,212 (PSU, 05/25/2021).

Insights

Securities Compliance Counsel

Form 144 records a proposed sale of 80,000 Class A shares and lists multiple RSU/PSU lots.

The filing shows a broker-dealer entry for 80,000 Class A common shares tied to J.P. Morgan Securities LLC on 03/04/2026. It separately enumerates equity-compensation grants (RSUs/PSUs) with precise share counts and grant dates between 05/25/2021 and 03/10/2025.

Compliance focus should be on Rule 144 timing and reporting metrics for each lot; subsequent public filings will indicate actual sales and any 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
Class A Common Stock	J.P. Morgan Securities LLC 270 Park Ave 10th Floor New York NY 10017	80000	2115512.55	137801779	03/04/2026	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 *
Class A Common Stock	05/25/2021	RSU Issuance	Constellium SE (issuer)			11246	03/05/2026	Equity Compensation
Class A Common Stock	05/25/2021	PSU Issuance	Constellium SE (issuer)			6212	03/05/2026	Equity Compensation
Class A Common Stock	04/01/2022	RSU Issuance	Constellium SE (issuer)			13340	03/05/2026	Equity Compensation
Class A Common Stock	04/01/2022	PSU Issuance	Constellium SE (issuer)			8162	03/05/2026	Equity Compensation
Class A Common Stock	04/07/2023	RSU Issuance	Constellium SE (issuer)			7755	03/05/2026	Equity Compensation
Class A Common Stock	04/07/2023	PSU Issuance	Constellium SE (issuer)			23426	03/05/2026	Equity Compensation
Class A Common Stock	05/11/2024	RSU Issuance	Constellium SE (issuer)			14833	03/05/2026	Equity Compensation
Class A Common Stock	05/11/2024	PSU Issuance	Constellium SE (issuer)			19314	03/05/2026	Equity Compensation
Class A Common Stock	03/10/2025	RSU Issuance	Constellium SE (issuer)			14231	03/05/2026	Equity Compensation
Class A Common Stock	03/10/2025	PSU Issuance	Constellium SE (issuer)			16906	03/05/2026	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's Form 144 for CSTM announce?

It notifies a proposed sale of 80,000 Class A common shares with J.P. Morgan Securities LLC on 03/04/2026. The notice also lists multiple RSU and PSU grant lots with discrete share counts and grant dates between 05/25/2021 and 03/10/2025.

Does the Form 144 list equity-compensation lots for CSTM?

Yes. The filing enumerates several RSU and PSU issuances tied to Constellium with specific counts, including 11,246 RSUs and 6,212 PSUs dated 05/25/2021, among others shown in the notice.

Who is the broker-dealer referenced in the CSTM Form 144?

The filing records J.P. Morgan Securities LLC as the broker-dealer associated with the 80,000 Class A shares entry, with the record date of 03/04/2026 shown in the notice.

Are the RSU/PSU counts aggregated into the 80,000 figure?

The Form 144 shows an 80,000 share line and separately lists multiple RSU/PSU lots with counts; the filing presents these as discrete entries and does not aggregate them into a single total in the excerpt.

When will the actual sale appear in filings for CSTM?

This Form 144 is a proposed-sale notice; actual sale details would appear in subsequent transaction filings or broker reports and are not presented as completed sales in this excerpt.