CENTURY ALUMINUM CO (CENX)

Data as of Jun 17, 2026, from SEC Form 4 filings.

No open-market insider trades (90d)Watch CENX

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Latest CENX insider trades

Peter A. Trpkovski - Officer
Open-market sale$845K
Mar 25, 2026
Jesse E. Gary - Officer
Open-market sale

About CENTURY ALUMINUM CO (CENX)

CENTURY ALUMINUM CO files with the SEC under CIK 0000949157 and is classified as primary production of aluminum. It is grouped with Materials companies on this site.

Sector: Materials

SEC filings for CENX on EDGAR

CENX Form 4 activity by transaction type, last 90 days

No Form 4 activity for CENX in the last 90 days.

CENX insider transactions (Form 4)

28 Form 4 filings on record, the earliest from Oct 2, 2024, newest first.

Date	Insider	Transaction	Security	Shares	Price	Value
Jun 15, 2026	Jarl Berntzen - Director	Grant or award	Common Stock	2,172^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in… Full note on SEC EDGAR
Jun 15, 2026	Errol Glasser - Director	Grant or award	Common Stock	2,172^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant.
Jun 15, 2026	Andrew G. Michelmore - Director	Grant or award	Common Stock	2,172^{footnote F1}	$0.00	-
Jun 15, 2026	Andrew G. Michelmore - Director	Tax withholding / forfeiture	Common Stock	652^{footnote F2}	$54.55	$36K
Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant. Footnote F2 (shares): Represents shares withheld by the Issuer upon vesting of the RSUs to satisfy tax obligations.
Jun 15, 2026	Jennifer Mary Bush - Director	Grant or award	Common Stock	2,172^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in… Full note on SEC EDGAR
Jun 15, 2026	Tamla A. Olivier - Director	Grant or award	Common Stock	2,172^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in… Full note on SEC EDGAR
Mar 25, 2026	Peter A. Trpkovski - Officer	Open-market sale	Common Stock	16,739	$50.51^{footnote F1}	$845K
Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $50.50 to $50.64, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Mar 16, 2026	Jesse E. Gary - Officer	Open-market sale	Common Stock	150,000	$55.47^{footnote F2}	$8.32M
Footnote F2 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $54.08 to $56.80, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Mar 12, 2026	Kenneth L. Calloway - Officer	Open-market sale	Common Stock	18,000	$58.00	$1.04M
Mar 11, 2026	Robert F. Hoffman - Officer	Open-market sale	Common Stock	10,529	$56.51^{footnote F1}	$595K
Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $56.25 to $56.75, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Mar 4, 2026	Robert F. Hoffman - Officer	Open-market sale	Common Stock	10,000	$56.33^{footnote F1}	$563K
Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $56.15 to $56.50, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Mar 2, 2026	Matt Aboud - Officer	Open-market sale	Common Stock	12,126	$52.50^{footnote F1}	$637K
Mar 3, 2026	Matt Aboud - Officer	Open-market sale	Common Stock	2,971	$52.67^{footnote F2}	$156K
Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $51.28 to $53.21, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR Footnote F2 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $52.50 to $52.75, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Mar 4, 2026	GLENCORE INTERNATIONAL AG - 10% Owner	Open-market sale	Common Stock	6,315,245	$51.75	$326.81M
Feb 27, 2026	Agust F. Hafberg - Officer	Open-market sale	Common Stock	22,884	$51.24	$1.17M
Feb 25, 2026	Gunnar Gudlaugsson - Officer	Open-market sale	Common Stock	43,000	$54.10	$2.33M
Feb 23, 2026	John Dezee - Officer	Open-market sale	Common Stock	66,000	$50.72^{footnote F1}	$3.35M
Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $49.91 to $52.01, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Feb 9, 2026	Peter A. Trpkovski - Officer	Tax withholding / forfeiture	Common Stock	4,240^{footnote F1}	$54.36	$230K
Footnote F1 (shares): Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of RSUs previously granted to the Reporting Person on February 9, 2023.
Jan 12, 2026	Jesse E. Gary - Officer	Gift	Common Stock	314,611^{footnote F1}	$0.00	-
Jan 12, 2026	Jesse E. Gary - Officer	Gift	Common Stock	314,611^{footnote F1}	$0.00	-
Jan 23, 2026	Jesse E. Gary - Officer	Open-market sale	Common Stock	150,000	$48.19^{footnote F4}	$7.23M
Footnote F1 (shares): Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes for which the Reporting Person serves as trustee. Footnote F4 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $46.64 to $49.11, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Nov 10, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Open-market sale	Common Stock	9,000,000	$30.25	$272.25M
Nov 10, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Common Stock	4,948,591^{footnote F1}	-^{footnote F2}	-
Nov 10, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Series A Convertible Preferred Stock	49,486	-^{footnote F2}	-
Footnote F1 (shares): Represents shares of Common Stock acquired upon the automatic conversion of 49,485.91 shares of Series A Convertible Preferred Stock upon the consummation of the transaction reported in Line 1 of Table 1. Footnote F2 (price): Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock was… Full note on SEC EDGAR
Sep 30, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Common Stock	2,848	-	-
Sep 30, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Series A Convertible Preferred Stock	28.48	-	-
Sep 26, 2025	Agust F. Hafberg - Officer	Open-market sale	Common Stock	9,493	$27.91	$265K
Sep 19, 2025	Kenneth L. Calloway - Officer	Open-market sale	Common Stock	16,450	$27.50	$452K
Aug 12, 2025	Matt Aboud - Officer	Open-market sale	Common Stock	12,027	$23.27	$280K
Jun 30, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Common Stock	16,477	-	-
Jun 30, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Series A Convertible Preferred Stock	164.77	-	-
Jun 16, 2025	Errol Glasser - Director	Grant or award	Common Stock	7,778	$0.00	-
Mar 31, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Common Stock	3,593	-	-
Mar 31, 2025	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Series A Convertible Preferred Stock	35.93	-	-
Dec 26, 2024	Jesse E. Gary - Officer	Open-market sale	Common Stock	29,243	$18.97	$555K
Dec 27, 2024	Jesse E. Gary - Officer	Open-market sale	Common Stock	50,000	$18.48	$924K
Dec 5, 2024	Gunnar Gudlaugsson - Officer	Open-market sale	Common Stock	20,000	$23.85	$477K
Sep 30, 2024	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Common Stock	13,192	-	-
Sep 30, 2024	GLENCORE INTERNATIONAL AG - 10% Owner	Other	Series A Convertible Preferred Stock	131.92	-	-

Recent CENX Form 8-K filings

Read CENX company news

Aug 6, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Jun 17, 2026Item 5.07, 9.01

Read the filing on SEC EDGAR

May 7, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Mar 3, 2026Item 4.02

Read the filing on SEC EDGAR

Recent CENX 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 9, 2026	-	-	-	-	View on EDGAR

CENX insider trading FAQ

What is the latest insider trade for CENX?

CENTURY ALUMINUM CO (CENX) has filed no insider reports in the last 90 days. The most recent on record is dated 2026-06-17. The full record for CENX runs to 28 Form 4 filings, the earliest from 2024-10-02. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.

How many insiders are buying CENX stock?

No insider purchases of CENX were filed in the last 90 days.

How many insiders are selling CENX stock?

No insider sales of CENX were filed in the last 90 days. 19 sales are on record for this company.

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

This page collects CENX 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.

Jun 17, 2026 - Jarl Berntzen view on EDGAR
Jun 17, 2026 - Errol Glasser view on EDGAR
Jun 17, 2026 - Andrew G. Michelmore view on EDGAR
Jun 17, 2026 - Jennifer Mary Bush view on EDGAR
Jun 17, 2026 - Tamla A. Olivier view on EDGAR
Mar 27, 2026 - Peter A. Trpkovski view on EDGAR
Mar 17, 2026 - Jesse E. Gary view on EDGAR
Mar 13, 2026 - Kenneth L. Calloway view on EDGAR
Mar 13, 2026 - Robert F. Hoffman view on EDGAR

Related companies with recent insider activity

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Learn more

What the Form 4 transaction codes mean: Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
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 CENX'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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Date

Insider

Transaction

Security

Price

Value

Jun 15, 2026

Jarl Berntzen - Director

Grant or award

Common Stock

2,172^{footnote F1}

$0.00

Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in… Full note on SEC EDGAR

Jun 15, 2026

Errol Glasser - Director

Grant or award

Common Stock

2,172^{footnote F1}

$0.00

Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant.

Jun 15, 2026

Andrew G. Michelmore - Director

Grant or award

Common Stock

2,172^{footnote F1}

$0.00

Jun 15, 2026

Andrew G. Michelmore - Director

Tax withholding / forfeiture

Common Stock

652^{footnote F2}

$54.55

$36K

Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant.
Footnote F2 (shares): Represents shares withheld by the Issuer upon vesting of the RSUs to satisfy tax obligations.

Jun 15, 2026

Jennifer Mary Bush - Director

Grant or award

Common Stock

2,172^{footnote F1}

$0.00

Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in… Full note on SEC EDGAR

Jun 15, 2026

Tamla A. Olivier - Director

Grant or award

Common Stock

2,172^{footnote F1}

$0.00

Footnote F1 (shares): Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in… Full note on SEC EDGAR

Mar 25, 2026

Peter A. Trpkovski - Officer

Open-market sale

Common Stock

16,739

$50.51^{footnote F1}

$845K

Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $50.50 to $50.64, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Mar 16, 2026

Jesse E. Gary - Officer

Open-market sale

Common Stock

150,000

$55.47^{footnote F2}

$8.32M

Footnote F2 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $54.08 to $56.80, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Mar 12, 2026

Kenneth L. Calloway - Officer

Open-market sale

Common Stock

18,000

$58.00

$1.04M

Mar 11, 2026

Robert F. Hoffman - Officer

Open-market sale

Common Stock

10,529

$56.51^{footnote F1}

$595K

Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $56.25 to $56.75, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Mar 4, 2026

Robert F. Hoffman - Officer

Open-market sale

Common Stock

10,000

$56.33^{footnote F1}

$563K

Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $56.15 to $56.50, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Mar 2, 2026

Matt Aboud - Officer

Open-market sale

Common Stock

12,126

$52.50^{footnote F1}

$637K

Mar 3, 2026

Matt Aboud - Officer

Open-market sale

Common Stock

2,971

$52.67^{footnote F2}

$156K

Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $51.28 to $53.21, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR
Footnote F2 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $52.50 to $52.75, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Mar 4, 2026

GLENCORE INTERNATIONAL AG - 10% Owner

Open-market sale

Common Stock

6,315,245

$51.75

$326.81M

Feb 27, 2026

Agust F. Hafberg - Officer

Open-market sale

Common Stock

22,884

$51.24

$1.17M

Feb 25, 2026

Gunnar Gudlaugsson - Officer

Open-market sale

Common Stock

43,000

$54.10

$2.33M

Feb 23, 2026

John Dezee - Officer

Open-market sale

Common Stock

66,000

$50.72^{footnote F1}

$3.35M

Footnote F1 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $49.91 to $52.01, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Feb 9, 2026

Peter A. Trpkovski - Officer

Tax withholding / forfeiture

Common Stock

4,240^{footnote F1}

$54.36

$230K

Footnote F1 (shares): Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of RSUs previously granted to the Reporting Person on February 9, 2023.

Jan 12, 2026

Jesse E. Gary - Officer

Gift

Common Stock

314,611^{footnote F1}

$0.00

Jan 12, 2026

Jesse E. Gary - Officer

Gift

Common Stock

314,611^{footnote F1}

$0.00

Jan 23, 2026

Jesse E. Gary - Officer

Open-market sale

Common Stock

150,000

$48.19^{footnote F4}

$7.23M

Footnote F1 (shares): Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes for which the Reporting Person serves as trustee.
Footnote F4 (price): The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $46.64 to $49.11, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security… Full note on SEC EDGAR

Nov 10, 2025

GLENCORE INTERNATIONAL AG - 10% Owner

Open-market sale

Common Stock

9,000,000

$30.25

$272.25M

Nov 10, 2025

GLENCORE INTERNATIONAL AG - 10% Owner

Other

Common Stock

4,948,591^{footnote F1}

-^{footnote F2}

Nov 10, 2025

GLENCORE INTERNATIONAL AG - 10% Owner

Other

Series A Convertible Preferred Stock

49,486

-^{footnote F2}

Footnote F1 (shares): Represents shares of Common Stock acquired upon the automatic conversion of 49,485.91 shares of Series A Convertible Preferred Stock upon the consummation of the transaction reported in Line 1 of Table 1.
Footnote F2 (price): Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock was… Full note on SEC EDGAR

Sep 30, 2025

GLENCORE INTERNATIONAL AG - 10% Owner

Other

Common Stock

2,848

Sep 30, 2025

GLENCORE INTERNATIONAL AG - 10% Owner

Other

Series A Convertible Preferred Stock

28.48

Sep 26, 2025

Agust F. Hafberg - Officer