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Constellium director buys 1,800 ordinary shares

The director's direct position stood at 45,315 ordinary shares after the reported transaction.

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Form Type
4

Rhea-AI Filing Summary

Constellium SE (CSTM) director Jean-Christophe Deslarzes purchased 1,800 ordinary shares on November 2, 2026, at $23.41 per share. His direct holdings after the purchase were 45,315 ordinary shares. No Rule 10b5-1 plan is reported.

Insider Deslarzes Jean-Christophe
Role Director
Bought 1,800 shs ($42K)
Increase in Position 4.1%
Type Security Shares Price Value
Purchase Ordinary shares 1,800 $23.41 $42K
Holdings After Transaction: Ordinary shares — 45,315 shares (Direct)
Holdings Before and After: Ordinary shares, 43,515 to 45,315 shares (Direct)
Ordinary shares purchased 1,800 ordinary shares Director purchase on November 2, 2026
Purchase price $23.41 per share Purchase on November 2, 2026
Direct holdings after purchase 45,315 ordinary shares Following the purchase on November 2, 2026

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How many CSTM shares did director Jean-Christophe Deslarzes buy?

Jean-Christophe Deslarzes, a CSTM director, purchased 1,800 ordinary shares on November 2, 2026, at $23.41 per share. His direct holdings after the purchase were 45,315 ordinary shares; no Rule 10b5-1 plan is reported.

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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Deslarzes Jean-Christophe

(Last)(First)(Middle)
300 EAST LOMBARD STREET
SUITE 1710

(Street)
BALTIMORE MARYLAND 21202

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
CONSTELLIUM SE [ CSTM ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Ordinary shares11/02/2026P1,800A$23.4145,315D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Kristine Carpenter, Attorney-in-Fact for Jean-Christophe Deslarzes11/03/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

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