Constellium (CSTM) president gains 71,132 vested shares, sells 4,728 for taxes

Rhea-AI Filing Summary

CONSTELLIUM SE President, A&T Philippe Hoffmann reported compensation-related share movements. On March 9, 2026, 71,132 ordinary shares were delivered upon vesting of performance-based stock unit awards granted on March 9, 2023. On March 10, 2026, he sold 4,728 ordinary shares solely to cover tax withholding obligations from those vestings, and held 182,120 shares afterward.

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^*

Hoffmann Philippe

(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)
	President, A&T

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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	03/09/2026		P		71,132(1)	A	$0	186,848	D
Ordinary shares	03/10/2026		S(2)		4,728	D	$25.87	182,120	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 earned non-derivative performance stock units of Constellium SE (the "Issuer") granted on March 9, 2023 that contained performance-vesting requirements, which vested on March 9, 2026.

2. The Reporting Person sold 4,728 ordinary shares of the Issuer upon the vesting of restricted stock unit and performance stock unit awards previously granted on March 9, 2023, solely to satisfy tax withholding obligations incurred upon vesting.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Philippe Hoffmann	03/11/2026
	** 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).
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FAQ

What insider transactions did CONSTELLIUM (CSTM) report for Philippe Hoffmann?

CONSTELLIUM reported that President, A&T Philippe Hoffmann received 71,132 ordinary shares from vested performance stock units, then sold 4,728 shares. The sale was executed solely to satisfy tax withholding obligations tied to restricted and performance stock unit vesting.

How many CONSTELLIUM (CSTM) shares did Philippe Hoffmann acquire and sell?

Hoffmann acquired 71,132 ordinary shares upon vesting of performance stock units and sold 4,728 shares. The disposition occurred immediately after vesting and was undertaken only to cover tax withholding obligations, rather than as a discretionary open-market sale.

Why did Philippe Hoffmann sell CONSTELLIUM (CSTM) shares after vesting?

He sold 4,728 CONSTELLIUM ordinary shares solely to satisfy tax withholding obligations arising when previously granted restricted and performance stock units vested. This type of sale is a mechanical tax event rather than a discretionary decision to reduce his overall economic exposure.

What awards vested for Philippe Hoffmann at CONSTELLIUM (CSTM)?

Earned non-derivative performance stock units granted on March 9, 2023 vested on March 9, 2026, delivering 71,132 ordinary shares. These units had performance-vesting requirements, meaning the actual share delivery depended on achieving specified performance conditions over the vesting period.

How many CONSTELLIUM (CSTM) shares does Philippe Hoffmann hold after these transactions?

Following the vesting-related acquisition and tax-related sale, Hoffmann directly holds 182,120 CONSTELLIUM ordinary shares. This figure reflects his updated post-transaction position after receiving 71,132 shares from performance stock unit vesting and selling 4,728 shares to cover associated tax liabilities.