Constellium (CSTM) director Deslarzes buys 1,665 shares in open market

Rhea-AI Filing Summary

CONSTELLIUM SE director Jean-Christophe Deslarzes bought 1,665 ordinary shares in the open market. The purchase took place on March 2, 2026 at a price of $24.77 per share. After this transaction, he directly owns 40,700 ordinary shares of Constelium.

SEC Form 4

FORM 4

UNITED 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

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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 MD 21202

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CONSTELLIUM SE [ CSTM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
			Code	V	Amount	(A) or (D)	Price
Ordinary shares	03/02/2026		P		1,665	A	$24.77	40,700	D

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Jean-Christophe Deslarzes	03/17/2026
	** Signature of Reporting Person	Date
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.

FAQ

What did Constelium (CSTM) director Jean-Christophe Deslarzes report in this Form 4?

He reported an open-market purchase of 1,665 Constelium ordinary shares. The transaction occurred on March 2, 2026 at a price of $24.77 per share, increasing his directly held stake to 40,700 ordinary shares.

How many Constelium (CSTM) shares did the director buy and at what price?

The director bought 1,665 ordinary shares of Constelium. The shares were acquired in an open-market purchase at $24.77 per share, as disclosed in the Form 4 insider trading report for the March 2, 2026 transaction.

What is Jean-Christophe Deslarzes’ total Constelium (CSTM) shareholding after this transaction?

After the reported purchase, he directly owns 40,700 Constelium ordinary shares. This total reflects the additional 1,665 shares acquired on March 2, 2026 at $24.77 per share, according to the Form 4 filing.

Was the Constelium (CSTM) director’s Form 4 transaction a purchase or sale?

The filing shows a purchase transaction. Jean-Christophe Deslarzes executed an open-market buy of 1,665 Constelium ordinary shares at $24.77 per share, classified under transaction code “P” for a purchase in the non-derivative section.

Is the Constelium (CSTM) director’s ownership direct or through another entity?

The Form 4 characterizes the ownership as direct. The transaction is reported with a direct ownership code, indicating the 40,700 ordinary shares following the trade are held directly by Jean-Christophe Deslarzes, not through an intermediary entity.