Constellium (NYSE: CSTM) SVP sells 1,000 shares, retains 241,713

Rhea-AI Filing Summary

Constellium SE senior vice president Ludovic Piquier sold 1,000 ordinary shares in an open-market transaction. The sale took place on May 12, 2026 at a weighted average price of $33.57 per share, with individual trade prices ranging from $33.41 to $33.70.

After this sale, Piquier directly owns 241,713 ordinary shares of Constellium SE. The filing notes that detailed trade-by-trade pricing within the stated range is available upon request.

Insider Trade Summary

Net Seller: 1,000 shares ($33,570)

Net Sell 1 txn

Insider Piquier Ludovic

Role SVP Manuf Excellence & CTO

Sold 1,000 shs ($34K)

Type	Security	Shares	Price	Value
Sale	Ordinary shares	1,000	$33.57	$34K

Holdings After Transaction: Ordinary shares — 241,713 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 1,000 shares Weighted average sale price: $33.57 per share Sale price range: $33.41–$33.70 per share +1 more

4 metrics

Shares sold 1,000 shares Open-market sale on May 12, 2026

Weighted average sale price $33.57 per share Ordinary shares sold on May 12, 2026

Sale price range $33.41–$33.70 per share Multiple trades within reported transaction

Shares owned after transaction 241,713 shares Direct ownership following May 12, 2026 sale

Key Terms

open-market sale, weighted average price, Ordinary shares, Form 4

4 terms

open-market sale financial

"The transaction was classified as an open-market sale of ordinary shares."

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 for the multiple trades."

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.

Ordinary shares financial

"The transaction involved Constellium SE Ordinary shares."

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.

Form 4 regulatory

"The insider transaction was reported on SEC Form 4."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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^*

Piquier Ludovic

(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 Manuf Excellence & CTO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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	05/12/2026		S		1,000	D	$33.57(1)	241,713	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 $33.70, 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 Ludovic Piquier	05/13/2026
	** 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 Ludovic Piquier?

Constellium reported that SVP Manufacturing Excellence & CTO Ludovic Piquier sold 1,000 ordinary shares. The transaction was an open-market sale on May 12, 2026, reported on Form 4 as a routine insider share disposition.

At what price did Ludovic Piquier sell Constellium (CSTM) shares?

Ludovic Piquier sold 1,000 Constellium ordinary shares at a weighted average price of $33.57 per share. Individual trades were executed between $33.41 and $33.70, with detailed price breakdowns available from the company or the SEC upon request.

How many Constellium (CSTM) shares does Ludovic Piquier hold after this Form 4 sale?

Following the 1,000-share sale, Ludovic Piquier directly holds 241,713 Constellium ordinary shares. This post-transaction holding reflects his remaining equity stake as reported in the Form 4 filing for the May 12, 2026 transaction.

What role does Ludovic Piquier hold at Constellium (CSTM) in this Form 4 filing?

In the Form 4 filing, Ludovic Piquier is identified as Constellium’s SVP Manufacturing Excellence & Chief Technology Officer. His position classifies him as a company officer, making his equity trades reportable as insider transactions under SEC rules.

Were derivatives involved in Ludovic Piquier’s Constellium (CSTM) Form 4 transaction?

No derivatives were reported in this Form 4. The filing shows only a non-derivative transaction in ordinary shares, with no option exercises, conversions, or other derivative activities listed in the derivative summary section.