Constellium CFO sells 25,201 shares in open market

Constellium SE’s EVP & CFO, Jack Q. Guo, completed an open-market sale of 25,201 ordinary shares of the company on May 5, 2026.

Rhea-AI Filing Summary

Constellium SE’s EVP & CFO, Jack Q. Guo, completed an open-market sale of 25,201 ordinary shares of the company on May 5, 2026. The weighted average sale price was $32.62 per share, with individual trades executed between $32.62 and $32.68. After this transaction, he continues to directly hold 185,368 ordinary shares of Constellium, indicating he retained a substantial equity stake following the sale.

Insights

Equity compensation and insider-trading analyst

Constellium’s CFO sold 25,201 shares but kept a significantly larger remaining stake.

The filing shows EVP & CFO Jack Q. Guo executed an open-market sale of 25,201 ordinary shares at a weighted average price of $32.62. Trades occurred within a tight range of $32.62–$32.68, suggesting a routine liquidity event rather than distressed selling.

Following the transaction, Guo still directly owns 185,368 ordinary shares, far exceeding the number sold. No derivative positions are listed, and the footnote frames the trade as standard execution with a weighted-average disclosure. On its own, this looks like a normal portfolio move with limited thesis impact.

Insider Trade Summary

Net Seller: 25,201 shares

Net Sell 1 txn

Insider Guo Jack Q.

Role EVP & CFO

Sold 25,201 shs ($822K)

Type	Security	Shares	Price	Value
Sale	Ordinary shares	25,201	$32.62	$822K

Holdings After Transaction: Ordinary shares — 185,368 shares (Direct)

Footnotes (1)

1. F1. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.62 to $32.68, 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.

Key Figures

Shares sold: 25,201 shares Weighted average sale price: $32.62 per share Sale price range: $32.62–$32.68 +1 more

4 metrics

Shares sold 25,201 shares Open-market sale of ordinary shares on May 5, 2026

Weighted average sale price $32.62 per share Average price for the reported sale transactions

Sale price range $32.62–$32.68 Range of individual trade prices in the transaction

Shares held after sale 185,368 shares Direct ownership by CFO following the reported transaction

Key Terms

open-market sale, Ordinary shares, weighted average price

3 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.

Ordinary shares financial

""security_title": "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.

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Constellium (CSTM) CFO Jack Q. Guo report in this Form 4?

He reported an open-market sale of 25,201 Constellium ordinary shares. The transaction reflects a routine disposition, with trades executed around the low-$30 range, and he continues to hold a significantly larger remaining stake after the sale.

How many Constellium (CSTM) shares did the CFO sell and at what prices?

Jack Q. Guo sold 25,201 ordinary shares of Constellium. The weighted average sale price was $32.62 per share, with individual trades completed in a narrow band between $32.62 and $32.68, according to the Form 4 footnote.

How many Constellium (CSTM) shares does the CFO hold after this transaction?

After the reported sales, Jack Q. Guo directly holds 185,368 ordinary shares of Constellium. This post-transaction position is substantially larger than the number of shares sold, indicating he maintained a sizeable ownership stake in the company.

What type of transaction is disclosed for Constellium (CSTM) CFO in this Form 4?

The Form 4 discloses an open-market sale of Constellium ordinary shares by EVP & CFO Jack Q. Guo. The SEC coding identifies it as a non-derivative sale, rather than an option exercise, tax withholding event, gift, or restructuring transfer.

Does the Constellium (CSTM) Form 4 mention derivative or option exercises by the CFO?

No derivative or option exercises are listed in this Form 4 for Jack Q. Guo. The filing shows only a non-derivative open-market sale of ordinary shares, and the derivative position summary section is empty for this reporting period.

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

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Accepted by SEC EDGAR 05/07/2026 - 10:02 AM Learn about SEC filing dates

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^*

Guo Jack Q.

(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)
	EVP & CFO

2a. Foreign Trading Symbol

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

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	05/05/2026		S		25,201	D	$32.62(1)	185,368	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 $32.62 to $32.68, 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 Jack Guo	05/07/2026
	** 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)