Constellium (NYSE: CSTM) SVP sells 10,000 shares in open-market trade

Rhea-AI Filing Summary

Constellium SE senior vice president and chief procurement officer Marcus Becker sold 10,000 ordinary shares in an open-market transaction. The shares were sold at a weighted average price of $25.09 per share, with individual trade prices ranging from $25.08 to $25.11. Following this sale, he continues to directly own 27,175 ordinary shares of Constellium SE.

Insider Trade Summary

Net Seller: 10,000 shares ($250,900)

Net Sell 1 txn

Insider Becker Marcus

Role SVP CPO

Sold 10,000 shs ($251K)

Type	Security	Shares	Price	Value
Sale	Ordinary shares	10,000	$25.09	$251K

Holdings After Transaction: Ordinary shares — 27,175 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Becker Marcus

(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 CPO

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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	03/16/2026	03/16/2026	S		10,000	D	$25.09(1)	27,175	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 $25.08 to $25.11, 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 Marcus Becker	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 insider transaction did Constellium (CSTM) report for Marcus Becker?

Constellium reported that senior vice president and chief procurement officer Marcus Becker sold 10,000 ordinary shares. The transaction was an open-market sale, and he continues to hold 27,175 ordinary shares directly after the trade.

At what price did Marcus Becker sell Constellium (CSTM) shares?

Marcus Becker sold 10,000 Constellium ordinary shares at a weighted average price of $25.09 per share. According to the filing, individual sale prices ranged from $25.08 to $25.11, reflecting multiple trades executed within this narrow price band.

How many Constellium (CSTM) shares does Marcus Becker hold after the sale?

After selling 10,000 ordinary shares, Marcus Becker directly holds 27,175 Constellium shares. This remaining position, disclosed in the filing, reflects his ongoing equity stake as senior vice president and chief procurement officer of the company.

Was the Constellium (CSTM) insider transaction a market sale or another type?

The transaction was an open-market sale of ordinary shares by Marcus Becker. The Form 4 describes it with code “S,” meaning a sale in the open market or private transaction, at prices between $25.08 and $25.11 per share.

Does the Constellium (CSTM) filing mention multiple trade prices for the insider sale?

Yes. The filing notes the reported price is a weighted average, with shares sold in multiple transactions. Individual trades occurred at prices ranging from $25.08 to $25.11, and detailed per-trade pricing is available from the reporting person upon request.

What role does Marcus Becker hold at Constellium (CSTM) in this insider filing?

Marcus Becker is identified as an officer of Constellium SE, serving as senior vice president and chief procurement officer. The Form 4 reports his personal open-market sale of 10,000 ordinary shares and his remaining direct holdings after the transaction.