Constellium SE (CSTM) Form 144 lists 4,716 shares; RSU/PSU grants noted

Rhea-AI Filing Summary

Constellium SE reported a Rule 144 notice covering proposed sales of Common Stock by a selling holder. The filing lists 4,716 shares associated with an intermediary on 05/14/2026. It also records equity awards granted on 03/09/2026 (1,516 RSUs; 3,200 PSUs) and a past sale of 3,885 Class A Common on 03/11/2026 for $97,669.46.

Insights

Securities Counsel

Rule 144 notice documents an intended resale and recent equity award activity.

The filing lists proposed resale activity involving 4,716 shares with an intermediary on 05/14/2026 and shows equity compensation issuances of 1,516 RSUs and 3,200 PSUs on 03/09/2026. These are standard disclosures under Rule 144.

Cashflow treatment and intended disposition timing are not detailed in the excerpt; subsequent transfer or sale activity will depend on holder execution and transfer agent processing.

Key Figures

Proposed resale: 4,716 shares RSU issuance: 1,516 RSUs PSU issuance: 3,200 PSUs +1 more

4 metrics

Proposed resale 4,716 shares listed with intermediary on 05/14/2026

RSU issuance 1,516 RSUs issued on 03/09/2026

PSU issuance 3,200 PSUs issued on 03/09/2026

Shares sold in past 3 months 3,885 Class A Common sold on 03/11/2026 totaling $97,669.46

Key Terms

Rule 144, RSU, PSU, Selling holder/intermediary

4 terms

Rule 144 regulatory

"Form 144 notice covering 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.

RSU financial

"RSU Issuance | Constellium SE (issuer) | 1,516 | 03/09/2026"

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

PSU financial

"PSU Issuance | Constellium SE (issuer) | 3,200 | 03/09/2026"

A PSU is a company where the government owns a controlling stake and often plays a direct role in its management and strategy. Think of it like a business that operates with public oversight, similar to a town-run utility versus a private neighborhood service. Investors watch PSUs differently because government involvement can affect profits, dividend policies, regulatory treatment and stability, so these stocks may behave more like policy instruments than pure market-driven enterprises.

Selling holder/intermediary regulatory

"Common Stock | J.P. Morgan Securities LLC 270 Park Ave 10th Floor"

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	4716	157797.44	136150450	05/14/2026	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)			1516	03/09/2026	Equity Compensation
Common Stock	03/09/2026	PSU Issuance	Constellium SE (issuer)			3200	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
Martin Roy Jarrett Otterburn Manor Farm Lane Banbury X0 OX15 6JL	Class A Common	03/11/2026	3885	97669.46

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 mean for CSTM shareholders?

The Form 144 notifies the SEC of an intended resale of restricted or control securities by a holder. It lists proposed quantities, equity awards, and recent dispositions; it does not itself execute a sale or change outstanding share counts.

How many shares does the filing show being proposed for resale?

The excerpt lists a proposed amount of 4,716 shares linked to an intermediary on 05/14/2026. The filing also shows prior activity including the sale of 3,885 Class A Common on 03/11/2026 for $97,669.46.

Were any equity awards disclosed in the Form 144 excerpt?

Yes. The filing records equity compensation granted on 03/09/2026: 1,516 RSUs and 3,200 PSUs. Those award counts are listed as issuances on that date in the excerpt.

Does the Form 144 tell when the proposed sale will occur?

No. The notice provides the proposed resale quantities and an intermediary date of 05/14/2026, but the excerpt does not specify an effective sale date, pricing method, or final settlement details for the proposed disposition.

Who appears as the intermediary or broker for the filing?

The excerpt shows J.P. Morgan Securities LLC with an address noted in New York as the listed intermediary for the Common Stock entry associated with 05/14/2026.