Constellium SE (CSTM) reports proposed sale, PSU and RSU issuances

Rhea-AI Filing Summary

Constellium SE submitted a Form 144 reporting proposed sales of Common Stock and disclosing recent equity compensation activity. The filing lists 71,132 shares tied to a PSU issuance and 18,143 shares tied to RSU issuance, both dated 03/09/2026. It also records a sale of 80,000 Class A shares on 03/04/2026 with proceeds of $2,115,512.55.

Insights

Equity Compensation Analyst

Routine insider sale and compensation-related issuances reported.

The filing itemizes recent equity compensation events: a PSU issuance of 71,132 shares and an RSU issuance of 18,143 shares, both dated 03/09/2026. These entries reflect compensation accounting and grant activity rather than open-market purchases.

Separately, the report records a sale of 80,000 Class A shares on 03/04/2026 for $2,115,512.55. The excerpt does not specify the seller's identity beyond the address line or whether the sale was pursuant to a Rule 144 plan; cash-flow treatment and any holding-period qualifiers are not shown in the provided excerpt.

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	4728	122328.17	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)			71132	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Philippe Hoffmann corniche du Soleil 17 Sierre V8 3960	Class A Shares	03/04/2026	80000	2115512.55

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 report about share sales (CSTM)?

The Form 144 reports a proposed sale of common stock and compensation issuances. It lists a PSU issuance of 71,132 shares, an RSU issuance of 18,143 shares dated 03/09/2026, and a recorded sale of 80,000 Class A shares on 03/04/2026.

How much cash was reported from the recent Class A share sale in the filing?

The filing shows proceeds of $2,115,512.55 from a Class A share sale on 03/04/2026. The excerpt ties that dollar amount directly to the 80,000 shares listed under "Securities Sold During The Past 3 Months."

Are the PSU and RSU issuances in Constellium's Form 144 part of compensation?

Yes. The document labels both items as equity compensation: a PSU issuance (71,132 shares) and an RSU issuance (18,143 shares), each dated 03/09/2026, indicating grant-related issuances rather than open-market transactions.

Does the Form 144 specify who is selling the shares for CSTM?

The excerpt includes an address line and a named individual for the past sale entry, but it does not clearly attribute who will execute the proposed sales. The filing lists transaction dates and amounts without comprehensive seller identification for all items.

Does the filing state whether sales are under Rule 144 safe-harbor or include holding-period limits?

The provided excerpt does not include explicit language about Rule 144 safe-harbor, holding-period qualifiers, or resale conditions. The filing lists proposed and recent transactions without attaching conditional resale language in the visible text.