Constellium (CSTM) executive sells 1,500 shares, retains 65,020

Rhea-AI Filing Summary

Constellium SE executive Stephane Corre, President of the Automotive Structures & Industry segment, sold 1,500 ordinary shares in an open-market transaction at a weighted average price of $25.89 per share on March 10, 2026. After this sale, he directly holds 65,020 ordinary shares. The transaction was executed through multiple trades within a narrow price range of $25.88 to $25.89 per share, indicating a relatively small, routine disposition compared with his remaining stake.

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

OMB APPROVAL

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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^*

Corre Stephane

(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, AS&I

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

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	03/10/2026		S		1,500(1)	D	$25.89	65,020	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 $25.88 to $25.89, 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 Stephane Corre	03/12/2026
	** 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 Stephane Corre?

Constellium reported that executive Stephane Corre sold 1,500 ordinary shares in an open-market transaction at a weighted average price of $25.89 per share. The sale occurred on March 10, 2026, and was executed through multiple trades in a narrow price range.

At what price did the Constellium (CSTM) executive sell his shares?

Stephane Corre sold 1,500 Constellium ordinary shares at a weighted average price of $25.89 per share. According to the filing, the trades were executed between $25.88 and $25.89 per share across multiple transactions on March 10, 2026.

How many Constellium (CSTM) shares does Stephane Corre own after the sale?

Following the reported sale, Stephane Corre directly holds 65,020 Constellium ordinary shares. This remaining position shows he retains a substantial stake in the company even after disposing of 1,500 shares in the open market on March 10, 2026.

Was the Constellium (CSTM) insider sale a market transaction or part of a derivative exercise?

The transaction was an open-market sale of ordinary shares, not a derivative exercise. The Form 4 classifies it as a non-derivative transaction with code “S,” indicating a sale in the open market or a private transaction, rather than option exercise or conversion activity.

Who is the insider involved in the latest Constellium (CSTM) Form 4 filing?

The insider is Stephane Corre, who serves as President of Constellium’s Automotive Structures & Industry (AS&I) segment. He reported selling 1,500 ordinary shares and now directly holds 65,020 shares, reflecting his ongoing equity ownership in the company.