144: Filer Information

Filer CIK

0002098782

Filer CCC

XXXXXXXX

Is this a LIVE or TEST Filing?

LIVE

TEST

Submission Contact Information

Name

Phone

E-Mail Address

144: Issuer Information

Name of Issuer

Constellium SE

SEC File Number

001-35931

Address of Issuer

300 East Lombard Street
Suite 1710
Baltimore
MARYLAND
21202

Phone

412-403-3233

Name of Person for Whose Account the Securities are To Be Sold

Stephane Corre

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

Affiliate

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

5000

167590.6

136150450

05/08/2026

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

04/07/2023

RSU

Constellium SE (issuer)

1500

04/07/2023

Equity Compensation

Common

04/01/2022

PSU

Constellium SE (issuer)

3500

04/01/2022

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

03/10/2026

1500

38828.48

Stephane Corre
14 TER Rue du docteur
Teilhol
Aubiere � I0 � 63170

Class A Shares

02/25/2026

3200

82260

Stephane Corre
14 TER Rue du docteur
Teilhol
Aubiere � I0 � 63170

Class A Shares

02/27/2026

3000

74066

Stephane Corre
14 TER Rue du docteur
Teilhol
Aubiere � I0 � 63170

Class A Shares

05/01/2026

5000

160207.94

144: Remarks and Signature

Remarks

Date of Notice

05/08/2026

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

J.P. Morgan Securities LLC, Workplace Solutions, as Agent and Attorney in Fact for Stephane Corre, Constellium SE

144: Filer Information

Submission Contact Information

144: Issuer Information

144: Securities Information

144: Securities To Be Sold

144: Securities Sold During The Past 3 Months

144: Remarks and Signature

ATTENTION:

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

SEC Form 144 filed by Constellium SE