Constellium (CSTM) SVP sells 4,716 shares at $33.46 average price

Rhea-AI Filing Summary

Constellium SE senior vice president and Chief Innovation Officer Jarrett Martin sold 4,716 ordinary shares in an open-market transaction. The shares were sold on May 14, 2026 at a weighted average price of $33.46, with individual trade prices ranging from $33.41 to $33.55. After the sale, Martin directly holds 15,375 ordinary shares of Constellium SE.

Insider Trade Summary

Net Seller: 4,716 shares ($157,797)

Net Sell 1 txn

Insider Jarrett Martin

Role SVP Chief Innovation Officer

Sold 4,716 shs ($158K)

Type	Security	Shares	Price	Value
Sale	Ordinary shares	4,716	$33.46	$158K

Holdings After Transaction: Ordinary shares — 15,375 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 4,716 shares Weighted average sale price: $33.46 per share Shares owned after transaction: 15,375 shares +2 more

5 metrics

Shares sold 4,716 shares Ordinary shares sold on May 14, 2026

Weighted average sale price $33.46 per share Open-market sale price range $33.41–$33.55

Shares owned after transaction 15,375 shares Direct ownership following the sale

Number of sale transactions Multiple trades Executed within $33.41–$33.55 price range

Transaction code S Sale in open market or private transaction

Key Terms

open-market sale, weighted average price, Sale in open market or private transaction, Securities and Exchange Commission

4 terms

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average price financial

"The price reported is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Sale in open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

Securities and Exchange Commission regulatory

"the staff of the Securities and Exchange Commission, upon request"

A national government agency that enforces rules for buying, selling and disclosing information about stocks and other investments, acting like a referee and scorekeeper for financial markets. It requires companies to share clear, regular financial and business information and investigates fraud or rule-breaking, which matters to investors because those rules and disclosures help ensure fair prices, reduce hidden risks and make it easier to compare investment choices.

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^*

Jarrett Martin

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

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	05/14/2026		S		4,716	D	$33.46(1)	15,375	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 $33.41 to $33.55, 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:

	Kristine Carpenter, Attorney-in-fact for Martin Jarrett	05/18/2026
	** 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)

FAQ

What insider transaction did Constellium (CSTM) report for Jarrett Martin?

Constellium SE reported that SVP and Chief Innovation Officer Jarrett Martin completed an open-market sale of 4,716 ordinary shares. The transaction was disclosed on Form 4 and reflects a direct change in his personal shareholdings.

How many Constellium (CSTM) shares did Jarrett Martin sell and at what price?

Jarrett Martin sold 4,716 ordinary shares of Constellium SE at a weighted average price of $33.46 per share. Individual trade prices ranged from $33.41 to $33.55 during this open-market transaction.

How many Constellium (CSTM) shares does Jarrett Martin own after the sale?

Following the reported transaction, Jarrett Martin directly holds 15,375 ordinary shares of Constellium SE. This figure reflects his ownership after selling 4,716 shares in the open market at a weighted average price of $33.46.

Was the Constellium (CSTM) insider sale a single trade or multiple trades?

The sale was executed in multiple trades, with a reported weighted average price of $33.46. According to the disclosure, individual trades occurred at prices between $33.41 and $33.55, all grouped as one reported transaction on Form 4.

What does an open-market sale by a Constellium (CSTM) executive mean?

An open-market sale means the executive sold shares through regular stock exchange trading rather than a private arrangement. For Jarrett Martin, the Form 4 describes this as a “Sale in open market or private transaction” with direct ownership affected.