Constellium (CSTM) SVP awarded 4,376 RSUs vesting in 2029

Rhea-AI Filing Summary

Brun Nicolas reported acquisition or exercise transactions in this Form 4 filing.

CONSTELLIUM SE senior vice president Nicolas Brun reported an equity compensation award rather than a market purchase. He received 4,376 ordinary shares in the form of restricted stock units that were granted at no cash cost. These units vest in full on March 12, 2029, subject to his continued employment. Following this award, he is shown as holding 131,552 ordinary shares directly.

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^*

Brun Nicolas

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP PA, Comm & Sust

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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	03/12/2026	03/12/2026	A		4,376(1)	A	$0	131,552	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:

1. Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Nicolas Brun	03/16/2026
	** 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.
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FAQ

What did Constellium (CSTM) executive Nicolas Brun report in this Form 4?

Nicolas Brun reported receiving 4,376 ordinary shares as a restricted stock unit grant. The award is equity compensation granted at no cash cost, adding to his existing direct holdings in Constellium SE shares.

Is the Constellium (CSTM) Form 4 transaction a stock purchase or a compensation grant?

The Form 4 reflects a compensation grant, not an open-market stock purchase. Brun received 4,376 restricted stock units of Constellium SE as an award, classified as an acquisition under transaction code A.

When do Nicolas Brun’s Constellium (CSTM) restricted stock units vest?

The restricted stock units granted to Nicolas Brun vest in full on March 12, 2029. Vesting is conditioned on his continued employment with Constellium SE through that date, according to the footnote disclosure.

How many Constellium (CSTM) shares does Nicolas Brun hold after this Form 4 transaction?

After the reported grant, Brun holds 131,552 ordinary shares directly. This figure reflects his total direct share position following the award of 4,376 restricted stock units reported in the filing.

Did Nicolas Brun pay cash for the Constellium (CSTM) shares reported in this filing?

No cash was paid for these shares. The transaction price per share is reported as 0.0000, indicating the 4,376 ordinary shares were received as a restricted stock unit compensation grant rather than a market purchase.

What role does Nicolas Brun hold at Constellium (CSTM) in this Form 4?

In this filing, Nicolas Brun is identified as an officer of Constellium SE. His title is Senior Vice President, Public Affairs, Communications and Sustainability, reflecting a senior leadership position at the company.