Constellium SE (CSTM) discloses 10,391 PSU issuance; insiders reported March sales

Rhea-AI Filing Summary

Constellium SE submitted a Form 144 notice regarding proposed sales of Common Stock related to equity compensation. The filing lists a PSU issuance of 10,391 shares dated 03/09/2026 and reports sales during the past three months of 1,113 shares on 03/10/2026 and 10,000 shares on 03/16/2026. The transactions are presented as equity compensation and are administrative notices under Rule 144.

Insights

Securities Compliance Analyst

Form 144 lists equity-compensation-related sales and a PSU issuance.

The filing identifies a PSU issuance of 10,391 shares dated 03/09/2026 and two reported dispositions of 1,113 shares and 10,000 shares in March 2026. These entries are typical Rule 144 notices that disclose the proposed sale or resale of restricted or control securities.

Timing and cash‑flow treatment are not detailed in the excerpt; subsequent regulatory filings or broker confirmations would show completion or proceeds. This filing should be viewed as administrative disclosure rather than material corporate development.

Key Figures

PSU issuance: 10,391 shares Disposition: 1,113 shares Disposition: 10,000 shares

3 metrics

PSU issuance 10,391 shares PSU Issuance dated 03/09/2026

Disposition 1,113 shares Sold on 03/10/2026 (Marcus Becker)

Disposition 10,000 shares Sold on 03/16/2026 (Marcus Becker)

Key Terms

PSU Issuance, Equity Compensation, Rule 144

3 terms

PSU Issuance financial

"PSU Issuance | Constellium SE (issuer) | 03/09/2026"

Equity Compensation financial

"03/09/2026 | PSU Issuance | ... | Equity Compensation"

Equity compensation is pay given to employees, executives or contractors in the form of company ownership—such as stock, stock options or restricted shares—rather than just cash. It matters to investors because it can align workers' incentives with shareholders (like paying someone in slices of the same pie they help grow), but it also increases the number of shares outstanding and company expenses, affecting ownership percentages and earnings per share.

Rule 144 regulatory

"Form 144 notice regarding proposed sales of Common Stock"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

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Available on EDGAR 05/28/2026 - 12:47 PM Accepted by SEC EDGAR 05/28/2026 - 12:47 PM Learn about SEC filing dates

FAQ

What does Constellium SE's Form 144 (CSTM) disclose?

The filing discloses a PSU issuance of 10,391 shares dated 03/09/2026 and reported sales of 1,113 shares on 03/10/2026 and 10,000 shares on 03/16/2026. It is an administrative notice under Rule 144 regarding resale of restricted securities.

Who reported the sales in the Form 144 filing for CSTM?

The excerpt names Marcus Becker with addresses and records two dispositions: 1,113 shares on 03/10/2026 and 10,000 shares on 03/16/2026. The filing frames these as equity compensation‑related transactions.

Does the Form 144 state proceeds or receiving party for the sales?

The provided excerpt does not state purchaser identities or explicit cash proceeds. The entries list share counts and dates but do not include buyer names or a cash‑flow description within the visible lines.

Is this Form 144 a material event for Constellium SE shareholders?

This filing is a regulatory disclosure of proposed resale of shares tied to equity compensation. It is typically administrative in nature and does not by itself indicate a material corporate event or change to company operations or guidance.

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	10391	363002.51	136150450	05/28/2026	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)			10391	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
Marcus Becker Hirzlistrasse 17 Goldingen St. Gallen V8 8638	Common Stock	03/10/2026	1113	28796.8
Marcus Becker Hirzlistrasse 17 Goldingen St. Gallen V8 8638	Common Stock	03/16/2026	10000	250903.96

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)