Constellium (CSTM) SVP Stephen Walters sells 1,500 ordinary shares

Rhea-AI Filing Summary

Constellium SE senior vice president, general counsel and secretary Stephen Charles Walters reported an open-market sale of 1,500 ordinary shares on February 23, 2026. The shares were sold at a weighted average price of $25.39 per share, and his directly held stake is now reported as 0 shares.

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^*

Walters Stephen Charles

(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 GC & Secretary

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

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	02/23/2026	02/23/2026	S		1,500	D	$25.39(1)	0	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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.39 to $25.39, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Stephen Walters	02/24/2026
	** 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 insider transaction did Constellium (CSTM) report for Stephen Charles Walters?

Stephen Charles Walters reported selling 1,500 Constellium ordinary shares in an open-market transaction. The sale occurred at a weighted average price of $25.39 per share, and after the transaction his directly held share balance was reported as zero.

On what date did Constellium (CSTM) insider Stephen Walters sell shares?

Stephen Walters’ reported open-market sale of Constellium ordinary shares took place on February 23, 2026. The Form 4 shows 1,500 shares sold at a weighted average price of $25.39 per share, with no directly owned shares remaining after this transaction.

How many Constellium (CSTM) shares did Stephen Walters sell and at what price?

Stephen Walters sold 1,500 Constellium ordinary shares in a single reported transaction. The filing states a weighted average sale price of $25.39 per share, with all trades executed within that same price level range on the transaction date.

What is Stephen Walters’ role at Constellium (CSTM) in this Form 4 filing?

In the Form 4, Stephen Charles Walters is identified as Constellium’s senior vice president, general counsel and secretary. The filing links this officer role to his reported open-market sale of 1,500 ordinary shares at a weighted average price of $25.39 per share.

How many Constellium (CSTM) shares does Stephen Walters report owning after the sale?

After selling 1,500 ordinary shares, Stephen Walters reports direct ownership of zero Constellium shares. The Form 4’s post-transaction line lists 0.0000 ordinary shares directly held, reflecting the full disposition of the shares covered by this reported sale.