Constellium (NYSE: CSTM) director adds 1,490 shares in reported purchase

Rhea-AI Filing Summary

Constellium SE director Jean-Christophe Deslarzes purchased 1,490 ordinary shares on 2026-08-03 at $27.24 per share in a non-derivative transaction. Following this purchase, he directly holds 43,515 shares of Constellium SE. The Rule 10b5-1 trading-plan checkbox is unchecked.

Insider Trade Summary

Net Buyer: 1,490 shares

Net Buy 1 txn

Insider Deslarzes Jean-Christophe

Role Director

Bought 1,490 shs ($41K)

Type	Security	Shares	Price	Value
Purchase	Ordinary shares	1,490	$27.24	$41K

Holdings After Transaction: Ordinary shares — 43,515 shares (Direct)

Key Figures

Shares purchased: 1,490 shares Purchase price: $27.24 per share Shares owned after transaction: 43,515 shares +1 more

4 metrics

Shares purchased 1,490 shares Ordinary shares acquired on 2026-08-03 by director Jean-Christophe Deslarzes

Purchase price $27.24 per share Price paid for the 1,490 ordinary shares purchased

Shares owned after transaction 43,515 shares Direct ownership by Jean-Christophe Deslarzes following the reported purchase

Net buy shares 1,490 shares Net buy volume in this Form 4 according to the transaction summary

Key Terms

Ordinary shares, open market or private transaction, Rule 10b5-1

3 terms

Ordinary shares financial

"Security title reported as Ordinary shares in the non-derivative transaction"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

open market or private transaction financial

"Transaction code P described as Purchase in open market or private transaction"

Rule 10b5-1 financial

"The Rule 10b5-1 trading-plan checkbox on the form is left unchecked"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/03/2026 - 07:26 PM Accepted by SEC EDGAR 08/03/2026 - 07:25 PM Learn about SEC filing dates

FAQ

What insider transaction did Constellium (CSTM) report in this Form 4?

Constellium SE reported that director Jean-Christophe Deslarzes purchased 1,490 ordinary shares. The non-derivative transaction took place on 2026-08-03 at a price of $27.24 per share, increasing his directly held stake in the company.

How many CSTM shares does Jean-Christophe Deslarzes own after the reported trade?

After the reported trade, Jean-Christophe Deslarzes directly holds 43,515 Constellium SE ordinary shares. This figure represents his direct ownership immediately following the purchase of 1,490 shares disclosed in the Form 4 insider transaction.

Was the Constellium (CSTM) insider trade a purchase or a sale?

The Constellium SE insider trade was a purchase. Director Jean-Christophe Deslarzes bought 1,490 ordinary shares at $27.24 per share, and the filing’s transaction summary shows a net buy of 1,490 shares with no reported sales.

At what price were the Constellium (CSTM) shares bought by the director?

The shares were bought at a price of $27.24 per share. This per-share price applies to the entire block of 1,490 ordinary shares acquired by director Jean-Christophe Deslarzes in the non-derivative transaction dated 2026-08-03.

Was the Constellium (CSTM) insider purchase under a Rule 10b5-1 trading plan?

The purchase is not indicated as being under a Rule 10b5-1 plan. The filing’s Rule 10b5-1 trading-plan checkbox is unchecked, and there are no footnotes describing the transaction as executed pursuant to such a pre-arranged plan.

How large is the net share change in this Constellium (CSTM) Form 4 filing?

The net share change is a net buy of 1,490 shares. According to the transaction summary, there was one purchase transaction totaling 1,490 ordinary shares, with no reported sales, gifts, or derivative exercises in this filing.

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^*

Deslarzes Jean-Christophe

(Last) (First) (Middle)

300 EAST LOMBARD STREET

SUITE 1710

(Street)

BALTIMORE MARYLAND 21202

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
CONSTELLIUM SE [ CSTM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	08/03/2026		P		1,490	A	$27.24	43,515	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:

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Jean-Christophe Deslarzes	08/03/2026
	** 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.
* Form 4: SEC 1474 (03-26)