CONSTELLIUM SE (CSTM)

Data as of Aug 3, 2026, from SEC Form 4 filings.

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Latest CSTM insider trades

Jean-Christophe Deslarzes - Director
Open-market purchase$41K
Aug 3, 2026
John Ormerod - Director

About CONSTELLIUM SE (CSTM)

CONSTELLIUM SE is an SEC registrant, filing under CIK 0001563411, classified as secondary smelting and refining of nonferrous metals. We track it alongside the rest of the Materials sector.

Sector: Materials

SEC filings for CSTM on EDGAR

CSTM Form 4 activity by transaction type, last 90 days

Form 4 transaction type	Transactions	Shares	Total value
Open-market purchase	1	1,490	$41K

CSTM insider transactions (Form 4)

45 Form 4 filings on record, the earliest from Feb 24, 2026, newest first. Filing history page 1 of 2.

Date	Insider	Transaction	Security	Shares	Price	Value
Aug 3, 2026	Jean-Christophe Deslarzes - Director	Open-market purchase	Ordinary shares	1,490	$27.24	$41K
Jul 10, 2026	Ingrid Joerg - Officer	Tax withholding / forfeiture	Ordinary shares	2,984^{footnote F1}	$29.28	$87K
Footnote F1 (shares): Disposition represents shares withheld by the Issuer to satisfy tax withholding obligations and does not represent a discretionary transaction by the reporting person.
Jun 4, 2026	John Ormerod - Director	Open-market sale	Ordinary shares	8,000	$35.01	$280K
May 28, 2026	Marcus Becker - Officer	Open-market sale	Ordinary shares	10,391	$34.93^{footnote F1}	$363K
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $34.87 to $35.03, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 14, 2026	Bradley Lee Soultz - Director	Open-market purchase	Ordinary shares	2,500	$33.84^{footnote F1}	$85K
Footnote F1 (price): The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $33.81 to $33.84, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the… Full note on SEC EDGAR
May 14, 2026	Martin Jarrett - Officer	Open-market sale	Ordinary shares	4,716	$33.46^{footnote F1}	$158K
Footnote F1 (price): 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… Full note on SEC EDGAR
May 12, 2026	Ludovic Piquier - Officer	Open-market sale	Ordinary shares	1,000	$33.57^{footnote F1}	$34K
Footnote F1 (price): 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… Full note on SEC EDGAR
May 11, 2026	Nicolas Brun - Officer	Open-market sale	Ordinary shares	26,661	$33.85^{footnote F1}	$902K
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.79 to $34.04, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 8, 2026	Stephane Corre - Officer	Open-market sale	Ordinary shares	5,000	$33.52^{footnote F1}	$168K
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.50 to $33.59, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 5, 2026	Michiel Brandjes - Director	Open-market sale	Ordinary shares	10,400	$31.25^{footnote F1}	$325K
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.00 to $33.00, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 5, 2026	Jack Q. Guo - Officer	Open-market sale	Ordinary shares	25,201	$32.62^{footnote F1}	$822K
Footnote F1 (price): 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… Full note on SEC EDGAR
May 1, 2026	Philippe Hoffmann - Officer	Open-market sale	Ordinary shares	50,000	$31.92^{footnote F1}	$1.60M
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.77 to $32.16, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 1, 2026	Philip Ryan Jurkovic - Officer	Open-market sale	Ordinary shares	48,784	$32.01^{footnote F1}	$1.56M
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.10, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 1, 2026	Stephane Corre - Officer	Open-market sale	Ordinary shares	5,000	$32.04^{footnote F1}	$160K
Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.11, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR
May 1, 2026	Jean-Christophe Deslarzes - Director	Open-market purchase	Ordinary shares	1,325	$31.13	$41K
Mar 16, 2026	Marcus Becker - Officer	Open-market sale	Ordinary shares	10,000	$25.09^{footnote F1}	$251K
Footnote F1 (price): 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… Full note on SEC EDGAR
Mar 2, 2026	Jean-Christophe Deslarzes - Director	Open-market purchase	Ordinary shares	1,665	$24.77	$41K
Mar 12, 2026	Stephen Charles Walters - Officer	Grant or award	Ordinary shares	5,834	$0.00	-
Mar 12, 2026	Wiebke Weiler - Director	Grant or award	Ordinary shares	625^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Nicolas Brun - Officer	Grant or award	Ordinary shares	4,376^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Philip Ryan Jurkovic - Officer	Grant or award	Ordinary shares	10,210^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Ludovic Piquier - Officer	Grant or award	Ordinary shares	5,469^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Marcus Becker - Officer	Grant or award	Ordinary shares	3,938^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Ingrid Joerg - Officer	Grant or award	Ordinary shares	31,358^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Matthew B. Perkins - Officer	Grant or award	Ordinary shares	10,210^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Niklaus Schild - Officer	Grant or award	Ordinary shares	3,355^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Philippe Hoffmann - Officer	Grant or award	Ordinary shares	12,033^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Stephane Corre - Officer	Grant or award	Ordinary shares	7,293^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 12, 2026	Jack Q. Guo - Officer	Grant or award	Ordinary shares	19,690^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.
Mar 10, 2026	Stephane Corre - Officer	Open-market sale	Ordinary shares	1,500^{footnote F1}	$25.89	$39K
Footnote F1 (shares): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.88 to $25.89, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

Recent CSTM Form 8-K filings

Read CSTM company news

Jul 29, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

May 21, 2026Item 5.07, 9.01

Read the filing on SEC EDGAR

Apr 29, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Mar 12, 2026Item 8.01, 9.01

Recent CSTM Form 144 notices of proposed sale

An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.

Filed	Filer	Relationship	Shares	Market value	Notice
Jun 4, 2026	-	-	-	-	View on EDGAR
May 28, 2026	-	-	-	-

CSTM insider trading FAQ

What is the latest insider trade for CSTM?

CONSTELLIUM SE (CSTM) had 1 insider filing in the last 90 days, with the most recent on 2026-08-03. The full record for CSTM runs to 45 Form 4 filings, the earliest from 2026-02-24. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.

How many insiders are buying CSTM stock?

1 insider purchase of CSTM was filed in the last 90 days, totaling $41K.

How many insiders are selling CSTM stock?

No insider sales of CSTM were filed in the last 90 days. 26 sales are on record for this company.

Where can I see CSTM SEC filings (Form 4, 10-K, 10-Q, 8-K)?

This page collects CSTM Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.

More Materials companies with insider activity

Recent insider filings

The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.

Aug 3, 2026 - Jean-Christophe Deslarzes view on EDGAR
Jul 13, 2026 - Ingrid Joerg view on EDGAR
Jun 8, 2026 - John Ormerod view on EDGAR
Jun 1, 2026 - Marcus Becker view on EDGAR
May 18, 2026 - Bradley Lee Soultz view on EDGAR
May 18, 2026 - Martin Jarrett view on EDGAR
May 13, 2026 - Ludovic Piquier view on EDGAR
May 12, 2026 - Nicolas Brun view on EDGAR
May 12, 2026 - Stephane Corre view on EDGAR

Related companies with recent insider activity

$AQMSAqua Metals, Inc.

Learn more

How to read insider buying signals: What an open-market purchase by an insider can and cannot tell you.
Form 144 vs Form 4: A Form 144 announces a planned sale; the Form 4 reports it after it happens.
Insider activity in Materials: Where CSTM's peers are being bought and sold.
Every recent Form 4: The market-wide feed, updated as filings arrive from SEC EDGAR.

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Form 4 transaction type

Transactions

Total value

Open-market purchase

1,490

$41K

Date

Insider

Transaction

Security

Price

Value

Aug 3, 2026

Jean-Christophe Deslarzes - Director

Open-market purchase

Ordinary shares

1,490

$27.24

$41K

Jul 10, 2026

Ingrid Joerg - Officer

Tax withholding / forfeiture

Ordinary shares

2,984^{footnote F1}

$29.28

$87K

Footnote F1 (shares): Disposition represents shares withheld by the Issuer to satisfy tax withholding obligations and does not represent a discretionary transaction by the reporting person.

Jun 4, 2026

John Ormerod - Director

Open-market sale

Ordinary shares

8,000

$35.01

$280K

May 28, 2026

Marcus Becker - Officer

Open-market sale

Ordinary shares

10,391

$34.93^{footnote F1}

$363K

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $34.87 to $35.03, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 14, 2026

Bradley Lee Soultz - Director

Open-market purchase

Ordinary shares

2,500

$33.84^{footnote F1}

$85K

Footnote F1 (price): The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $33.81 to $33.84, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the… Full note on SEC EDGAR

May 14, 2026

Martin Jarrett - Officer

Open-market sale

Ordinary shares

4,716

$33.46^{footnote F1}

$158K

Footnote F1 (price): 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… Full note on SEC EDGAR

May 12, 2026

Ludovic Piquier - Officer

Open-market sale

Ordinary shares

1,000

$33.57^{footnote F1}

$34K

Footnote F1 (price): 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… Full note on SEC EDGAR

May 11, 2026

Nicolas Brun - Officer

Open-market sale

Ordinary shares

26,661

$33.85^{footnote F1}

$902K

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.79 to $34.04, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 8, 2026

Stephane Corre - Officer

Open-market sale

Ordinary shares

5,000

$33.52^{footnote F1}

$168K

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.50 to $33.59, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 5, 2026

Michiel Brandjes - Director

Open-market sale

Ordinary shares

10,400

$31.25^{footnote F1}

$325K

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.00 to $33.00, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 5, 2026

Jack Q. Guo - Officer

Open-market sale

Ordinary shares

25,201

$32.62^{footnote F1}

$822K

Footnote F1 (price): 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… Full note on SEC EDGAR

May 1, 2026

Philippe Hoffmann - Officer

Open-market sale

Ordinary shares

50,000

$31.92^{footnote F1}

$1.60M

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.77 to $32.16, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 1, 2026

Philip Ryan Jurkovic - Officer

Open-market sale

Ordinary shares

48,784

$32.01^{footnote F1}

$1.56M

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.10, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 1, 2026

Stephane Corre - Officer

Open-market sale

Ordinary shares

5,000

$32.04^{footnote F1}

$160K

Footnote F1 (price): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.11, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

May 1, 2026

Jean-Christophe Deslarzes - Director

Open-market purchase

Ordinary shares

1,325

$31.13

$41K

Mar 16, 2026

Marcus Becker - Officer

Open-market sale

Ordinary shares

10,000

$25.09^{footnote F1}

$251K

Footnote F1 (price): 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… Full note on SEC EDGAR

Mar 2, 2026

Jean-Christophe Deslarzes - Director

Open-market purchase

Ordinary shares

1,665

$24.77

$41K

Mar 12, 2026

Stephen Charles Walters - Officer

Grant or award

Ordinary shares

5,834

$0.00

Mar 12, 2026

Wiebke Weiler - Director

Grant or award

Ordinary shares

625^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Nicolas Brun - Officer

Grant or award

Ordinary shares

4,376^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Philip Ryan Jurkovic - Officer

Grant or award

Ordinary shares

10,210^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Ludovic Piquier - Officer

Grant or award

Ordinary shares

5,469^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Marcus Becker - Officer

Grant or award

Ordinary shares

3,938^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Ingrid Joerg - Officer

Grant or award

Ordinary shares

31,358^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Matthew B. Perkins - Officer

Grant or award

Ordinary shares

10,210^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Niklaus Schild - Officer

Grant or award

Ordinary shares

3,355^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Philippe Hoffmann - Officer

Grant or award

Ordinary shares

12,033^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Stephane Corre - Officer

Grant or award

Ordinary shares

7,293^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 12, 2026

Jack Q. Guo - Officer

Grant or award

Ordinary shares

19,690^{footnote F1}

$0.00

Footnote F1 (shares): Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Mar 10, 2026

Stephane Corre - Officer

Open-market sale

Ordinary shares

1,500^{footnote F1}

$25.89

$39K

Footnote F1 (shares): The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.88 to $25.89, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities… Full note on SEC EDGAR

Filed

Filer

Relationship

Market value

Notice

Jun 4, 2026

View on EDGAR

May 28, 2026