# EDGAR Filing Document

**Accession Number:** 0000949157
**File Stem:** 0001104659-25-109946
**Filing Date:** 2025-11
**Character Count:** 41863
**Document Hash:** 46ae79f416111f6f4b64120beea379c6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-109946.hdr.sgml**: 20251112

**ACCESSION NUMBER**: 0001104659-25-109946

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 5

**FILED AS OF DATE**: 20251112

**DATE AS OF CHANGE**: 20251112

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CENTURY ALUMINUM CO
- **CENTRAL INDEX KEY:** 0000949157
- **STANDARD INDUSTRIAL CLASSIFICATION:** PRIMARY PRODUCTION OF ALUMINUM [3334]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 133070826
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-47307
- **FILM NUMBER:** 251470118

**BUSINESS ADDRESS:**
- **STREET 1:** 1 SOUTH WACKER DRIVE
- **STREET 2:** SUITE 1000
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3126963101

**MAIL ADDRESS:**
- **STREET 1:** 1 SOUTH WACKER DRIVE
- **STREET 2:** SUITE 1000
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GLENCORE INTERNATIONAL AG
- **CENTRAL INDEX KEY:** 0001032383

**ORGANIZATION NAME:**
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** BAARERMATTSTRASSE 3
- **STREET 2:** P O BOX 555 CH 6341 BAAR
- **CITY:** BAAR
- **PROVINCE COUNTRY:** V8
- **BUSINESS PHONE:** 4142227722

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** BAARERMATTSTRASSE 3
- **STREET 2:** P O BOX 555 CH 6341 BAAR
- **CITY:** BAAR
- **PROVINCE COUNTRY:** V8

## Exhibit 24.1

**Exhibit 24.1**

POWER OF ATTORNEY

Know all by these present, that the undersigned hereby constitute and appoint John Burton, Shaun Teichner and Martin Häring, any such person acting singly, as the undersigned's true and lawful attorneys-in-fact, to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) execute and file with the United States Securities and Exchange Commission (the "SEC") and any stock exchange or similar authority, for and on behalf of the undersigned, in any and all capacities, any and all reports required to be filed by the undersigned pursuant to Section 13(d) or Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the rules and regulations promulgated thereunder and Rule 144 of the Securities Act of 1933, as amended (the "Securities Act"), with respect to securities which are or may be deemed to be beneficially owned by the undersigned, including but not limited to reports on Schedule 13D or Schedule 13G and Forms 3, 4, 5 and 144, and any and all amendments to such reports and forms, with all exhibits and any other document or instrument as may be required in connection with the filing of such report or form; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) do and perform, acting singly, any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such filings on Schedule 13D or Schedule 13G or Forms 3, 4, 5 or 144, or other form or report, or any amendment or amendments thereto, and timely file such report or form with the SEC; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) take any other action of any type, acting singly, in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, in connection with the preparation, execution and filing of such reports and forms, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact, acting singly, full power and authority to do and perform each and every act and thing requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.

The undersigned acknowledges that the foregoing attorney-in-fact, by serving in such capacity at the request of the undersigned, is not assuming any of the responsibilities of the undersigned to comply with Section 13(d) or Section 16 of the Exchange Act, Rule 144 of the Securities Act or any other provision thereof or other rule or regulation of the SEC.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in signed writing or shall be automatically revoked for the relevant person if the attorney-in-fact ceases to be an employee of the Glencore Group.

*[signature page follows]*

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 18<sup>th</sup> day of November 2024.

---

| | |
|:---|:---|
| Glencore AG | Glencore AG |
| By: | /s/ Carlos Perezagua & Stephan Engelbert Huber |
| Name: | Carlos Perezagua & Stephan Engelbert Huber |
| Title: | Directors |

---

*[Signature Page to SEC Power of Attorney]*

## Exhibit 24.2

**Exhibit 24.2**

**POWER OF ATTORNEY**

Know all by these present, that the undersigned hereby constitute and appoint John Burton, Shaun Teichner and Martin Haering, any such person acting singly, as the undersigned's true and lawful attorneys-in-fact, to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) execute and file with the United States Securities and Exchange Commission (the "SEC") and any stock exchange or similar authority, for and on behalf of the undersigned, in any and all capacities, any and all reports required to be filed by the undersigned pursuant to Section 13(d) or Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the rules and regulations promulgated thereunder and Rule 144 of the Securities Act of 1933, as amended (the "Securities Act"), with respect to securities which are or may be deemed to be beneficially owned by the undersigned, including but not limited to reports on Schedule 13D or Schedule 13G and Forms 3, 4, 5 and 144, and any and all amendments to such reports and forms, with all exhibits and any other document or instrument as may be required in connection with the filing of such report or form; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) do and perform, acting singly, any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such filings on Schedule 13D or Schedule 13G or Forms 3, 4, 5 or 144, or other form or report, or any amendment or amendments thereto, and timely file such report or form with the SEC; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) take any other action of any type, acting singly, in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, in connection with the preparation, execution and filing of such reports and forms, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact, acting singly, full power and authority to do and perform each and every act and thing requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.

The undersigned acknowledges that the foregoing attorney-in-fact, by serving in such capacity at the request of the undersigned, is not assuming any of the responsibilities of the undersigned to comply with Section 13(d) or Section 16 of the Exchange Act, Rule 144 of the Securities Act or any other provision thereof or other rule or regulation of the SEC.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in signed writing or shall be automatically revoked for the relevant person if the attorney-in-fact ceases to be an employee of the Glencore Group.

*[signature page follows]*

 

 

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 18<sup>th</sup> day of November 2024.

---

| | |
|:---|:---|
| Glencore International AG | Glencore International AG |
| By: | /s/ Gary Nagle & Steven Kalmin |
| Name: | Gary Nagle & Steven Kalmin |
| Title: | Directors |

---

*[Signature Page to SEC Power of Attorney]*

## Exhibit 24.3

**Exhibit 24.3**

**POWER OF ATTORNEY**

Know all by these present, that the undersigned hereby constitute and appoint John Burton, Shaun Teichner and Martin Haering, any such person acting singly, as the undersigned's true and lawful attorneys-in-fact, to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) execute and file with the United States Securities and Exchange Commission (the "SEC") and any stock exchange or similar authority, for and on behalf of the undersigned, in any and all capacities, any and all reports required to be filed by the undersigned pursuant to Section 13(d) or Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the rules and regulations promulgated thereunder and Rule 144 of the Securities Act of 1933, as amended (the "Securities Act"), with respect to securities which are or may be deemed to be beneficially owned by the undersigned, including but not limited to reports on Schedule 13D or Schedule 13G and Forms 3, 4, 5 and 144, and any and all amendments to such reports and forms, with all exhibits and any other document or instrument as may be required in connection with the filing of such report or form; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) do and perform, acting singly, any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such filings on Schedule 13D or Schedule 13G or Forms 3, 4, 5 or 144, or other form or report, or any amendment or amendments thereto, and timely file such report or form with the SEC; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) take any other action of any type, acting singly, in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, in connection with the preparation, execution and filing of such reports and forms, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact, acting singly, full power and authority to do and perform each and every act and thing requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.

The undersigned acknowledges that the foregoing attorney-in-fact, by serving in such capacity at the request of the undersigned, is not assuming any of the responsibilities of the undersigned to comply with Section 13(d) or Section 16 of the Exchange Act, Rule 144 of the Securities Act or any other provision thereof or other rule or regulation of the SEC.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in signed writing or shall be automatically revoked for the relevant person if the attorney-in-fact ceases to be an employee of the Glencore Group.

*[signature page follows]*

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 18<sup>th</sup> day of November 2024.

---

| | |
|:---|:---|
| Glencore plc | Glencore plc |
| By: | /s/ Gary Nagle & Steven Kalmin |
| Name: | Gary Nagle & Steven Kalmin |
| Title: | CEO CFO |

---

*[Signature Page to SEC Power of Attorney]*

## Exhibit 99.1

**Exhibit 99.1**

**JOINT FILING AGREEMENT**

Each of the undersigned hereby agrees that this Amendment No. 29 to the statement on Schedule 13D is being filed with the Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Date: November 12, 2025

---

| | |
|:---|:---|
| **Glencore AG** | **Glencore AG** |
| By: | /s/ John Burton |
| Name: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;John Burton |
| Title: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Attorney-in-Fact |

---

---

| | |
|:---|:---|
| **Glencore International AG** | **Glencore International AG** |
| By: | /s/ John Burton |
| Name: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;John Burton |
| Title: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Attorney-in-Fact |

---

---

| | |
|:---|:---|
| **Glencore plc** | **Glencore plc** |
| By: | /s/ John Burton |
| Name: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;John Burton |
| Title: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Attorney-in-Fact |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 29)**

**CENTURY ALUMINUM COMPANY**

*(Name of Issuer)*

**Common Stock, $0.01 Par Value**

*(Title of Class of Securities)*

**156431108**

*(CUSIP Number)*

**Steven Kalmin**<br>Baarermattstrasse 3<br>Baar V8 CH-6340<br>41 41 709 2000

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**11/10/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **156431108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Glencore International AG** | Name of reporting person<br>**Glencore International AG** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[x] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[x] | |
| 6 | Citizenship or place of organization<br>**V8** | Citizenship or place of organization<br>**V8** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**36005947.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**36005947.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**36005947.00** | Aggregate amount beneficially owned by each reporting person<br>**36005947.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**36.6%** | Percent of class represented by amount in Row (11)<br>**36.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **156431108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Glencore plc** | Name of reporting person<br>**Glencore plc** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[x] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[x] | |
| 6 | Citizenship or place of organization<br>**Y9** | Citizenship or place of organization<br>**Y9** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**36005947.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**36005947.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**36005947.00** | Aggregate amount beneficially owned by each reporting person<br>**36005947.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**36.6%** | Percent of class represented by amount in Row (11)<br>**36.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **156431108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Glencore AG** | Name of reporting person<br>**Glencore AG** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[x] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[x] | |
| 6 | Citizenship or place of organization<br>**V8** | Citizenship or place of organization<br>**V8** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**17505947.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**17505947.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**17505947.00** | Aggregate amount beneficially owned by each reporting person<br>**17505947.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**17.8%** | Percent of class represented by amount in Row (11)<br>**17.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.01 Par Value

**(b) Name of Issuer:**
CENTURY ALUMINUM COMPANY

**(c) Address of Issuer's Principal Executive Offices:**
One South Wacker Drive, Suite 1000, Chicago, IL, 60606

Century Aluminum Company is a Delaware Corporation

**Item 4. Purpose of Transaction**

The Reporting Persons remain confident in the management team and outlook of the Company, maintain a position in the Company and intend to continue to hold Common Stock for investment purposes.

Since the Company's initial public offering in 1996, in which the Reporting Persons sold approximately 60% of their Common Stock, the Reporting Persons have held Common Stock, and have acquired additional securities of the Company, for investment purposes. On November 10, 2025, the Reporting Persons decided to rebalance and optimize its global aluminium investment portfolio, and thereby took action to monetize a portion of their investment via a sale of 9,000,000 shares in a block trade pursuant to Rule 144 and subject to customary conditions (the "Subject Sale"). Reference is made to Item 6 of the Statement and the Certificate of Designation for the Series A Preferred Shares, all of which automatically converted into Common Stock upon consummation of the Subject Sale.

The Reporting Persons may also purchase or sell additional shares of Common Stock and other securities of the Issuer. Such transactions could be in the open market and/or in privately negotiated or structured transactions, provided that any such transactions would be on terms deemed favorable by the Reporting Persons. In addition, the Reporting Persons may formulate plans or proposals for, hold discussions with the Company's management, the Company's Board of Directors, the Company's stockholders and other parties about, and reserve the right to explore, or make plans or proposals relating to, transactions, discussions or actions which relate to or would result in any of the matters specified in clauses (a) through (j) of Item 4 of Schedule 13D. The Reporting Persons' consideration or discussion of any action would be based on their own assessment of various relevant considerations and any subsequent developments affecting the Company and its prospects.

**Item 5. Interest in Securities of the Issuer**

**(a)**
Glencore AG beneficially owns 17,505,947 shares of Common Stock, or 17.8% of the outstanding Common Stock, which it holds directly, and each of Glencore plc and Glencore International beneficially owns an aggregate of 36,005,947 shares of Common Stock, or 36.6% of the outstanding Common Stock, consisting of 18,500,000 shares held directly by Glencore International and the 17,505,947 shares held directly by Glencore AG. The shares reported as beneficially owned by the Reporting Persons include the 4,948,591 shares of Common Stock issued upon the automatic conversion of the 49,485.91 Series A Preferred Shares held directly by Glencore AG upon consummation of the Subject Sale.  As described more fully in Item 6 below, the Series A Preferred Shares held by Glencore AG were convertible at a conversion ratio of 100 shares of Common Stock for each Series A Preferred Share in the event of sales of Common Stock by the Reporting Persons and the occurrence of other diluting events, with each conversion capped at the number of Shares of Common Stock necessary to maintain the Reporting Persons' percentage ownership of Common Stock, and in certain other limited circumstances that would also not have resulted in an increase in the percentage of shares of Common Stock the Reporting Person would have had the power to vote or to direct the voting of.

To the best knowledge of the Reporting Persons, none of the other persons identified in Item 2(c) beneficially owns any shares of Common Stock.

The beneficial ownership percentages reported herein are based upon 98,290,560 shares of Common Stock outstanding, consisting of (i) 93,341,969 shares of Common Stock reported as outstanding as of November 6, 2025, based on the Company's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 6, 2025, and (ii) the 4,948,591 shares of Common Stock issued upon the automatic conversion of the 4,948.591 Series A Preferred Shares held by Glencore AG upon consummation of the Subject Sale. Reference is made to the discussion of the terms of the Certificate of Designation for the Series A Preferred Shares in Item 6 of the Statement.

**(b)**
The Reporting Persons share the power to vote and direct the voting of and to dispose or to direct the disposition of the 36,005,947  shares of Common Stock reported as beneficially owned by them herein, except that Glencore AG shares the power to vote and direct the voting of and to dispose or to direct the disposition of only the 17,505,947 shares held directly by it.

**(c)**
Except for the Subject Sale referenced in Item 4 above, in which, on November 10, 2025, Glencore International sold 9,000,000 shares of Common Stock at a price per share of $30.25 in a block trade under Rule 144, none of the Reporting Persons nor, to the Reporting Persons' knowledge, any of the other persons identified in Item 2(c), has engaged in any transaction during the past 60 days in any Common Stock.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Series A Preferred Stock Purchase: On July 7, 2008 the Company entered into a Stock Purchase Agreement with Glencore Investment Pty Ltd. ("Glencore Investment Pty") pursuant to which Glencore Investment Pty purchased the Series A Preferred Shares.  The following represents a summary of the terms of the agreements and instruments relating to the July 7, 2008 purchase of the Series A Preferred Shares that remain in effect:

Certificate of Designation:  The rights and privileges of the Series A Preferred Shares are set forth in a Certificate of Designation filed with the Secretary of State of the State of Delaware on July 7, 2008 (the "Certificate of Designation").  The following summarizes the material terms of the Series A Preferred Shares, as reflected in the Certificate of Designation:

Dividends.  Dividends will be declared and paid on the Series A Preferred Shares when, as and if, and in the same amounts (on an as-converted basis), declared and paid on the Common Stock.

Voting.  The Series A Preferred Shares has no voting rights, except to vote as a separate class on any proposal to or that would amend, alter or repeal or otherwise change any provision of the Company's Certificate of Incorporation or the Certificate of Designation if such amendment would increase or decrease the number of authorized shares of Series A Preferred Shares, increase or decrease the par value of the Series A Preferred Shares or alter or change the powers, preferences or special rights of the Series A Preferred Shares.

Liquidation Preference.  Upon liquidation, dissolution or winding up of the Company, holders of Series A Preferred Shares are entitled to a liquidation preference of $0.01 per share, and thereafter are entitled to share ratably (on an as-converted basis) with the Common Stock in the distribution of any remaining assets (net of an amount equivalent to the aggregate amount of the liquidation preference).

Automatic Conversion.  The Series A Preferred Shares shall be automatically converted into shares of Common Stock at a conversion ratio of 100 shares of Common Stock for each share of Series A Preferred Shares (the "Conversion Ratio") upon the occurrence of the following events: (i) any event that would dilute the Reporting Persons' percentage beneficial ownership of Common Stock (determined consistent with the definition of beneficial ownership under Rule 13d-3 under the Securities Exchange Act of 1934, as amended ("Rule 13d-3")), to the extent necessary to maintain the same percentage ownership as immediately prior to the diluting event; (ii) the sale or other transfer of Series A Preferred Shares to non-affiliates of the Reporting Persons, and (iii) upon the consummation of any merger or business combination transaction involving the Company or the sale of all or substantially all of the property or assets of the Company and its subsidiaries, unless the consideration in the transaction is other than cash or marketable securities and the Reporting Persons have voted their Common Stock against the transaction (in which case, the Series A Preferred Shares will be redeemed as described below).

Optional Conversion.  At the option of each holder, the Series A Preferred Shares may be converted into Common Stock at the Conversion Ratio and tendered into a tender or exchange offer in which a majority of the outstanding shares of Common Stock have been tendered.

Mandatory Redemption.  If (i) the Company proposes (x) to engage in a merger or business combination transaction involving the Company or to sell all or substantially all of the property or assets of the Company and its subsidiaries in a transaction where the consideration payable to the holders of Common Stock is other than cash, marketable securities or shares of the Company's subsidiaries, or (y) to dissolve and wind up (other than as part of a transaction contemplated by (x)) and assets other than cash, marketable securities or shares of the Company's subsidiaries will be distributed to the Company's stockholders, and (ii) the Reporting Persons vote any and all of their Common Stock against the proposal, the Company must redeem all of the Series A Preferred Shares at a redemption price equivalent to the average of the closing price for the Common Stock on Nasdaq for twenty (20) trading days starting twenty-two (22) trading days before the first public announcement of the Company's proposal.

Preemptive Rights.  If the Company proposes to issue or sell, in a transaction directed to holders of Common Stock, any Common Stock or other stock ranking on parity with the Common Stock (or any securities convertible or exchangeable for, or any options, warrants or other rights to subscribe for, such stock) (but excluding issuances to employees and issuances triggered under a stockholders rights plan by acquisitions by the Reporting Persons) at a price below the average of the closing price for the Common Stock on Nasdaq for twenty (20) trading days starting twenty-two (22) trading days before the Board of Directors authorizes such issuance or sale, the holders of Series A Preferred Shares must be given the opportunity to participate in such issuance on an as-converted basis.

Transfer Restrictions.  Except for transfers to pledgees (subject to certain conditions), the Series A Preferred Shares may be transferred only in widely-distributed public offerings or in transactions that comply with Rule 144 under the Securities Act of 1933, as amended, and following any such transfer, will automatically convert to Common Stock.
On November 10, 2025, all 49,485.91 shares of Series A Preferred Shares held by Glencore AG were automatically converted into 4,948,591 shares of Common Stock upon the consummation of the Subject Sale.  As a result of this conversion, the Reporting Persons no longer own any shares of Series A Preferred Stock.

Standstill and Governance Agreement:  In connection with the Stock Purchase Agreement, on July 7, 2008 Glencore AG and the Company entered into a Standstill and Governance Agreement (the "Governance Agreement").  Certain standstill obligations of Glencore AG and its affiliates under the Governance Agreement expired on each of April 8, 2009 and January 7, 2010.  No standstill obligations under the Governance Agreement are currently binding on Glencore AG or any of its affiliates.  The following is a summary of the material terms of the Governance Agreement that remain in effect today:

Board Representation. The Reporting Persons will have the right to designate a nominee for election to the Board of Directors, subject to the consent of the nominating committee. This right will terminate if the Reporting Persons (and their affiliates) beneficially own (within the meaning of Rule13d-3) less than 10% of the Common Stock for a period of three continuous months.

Registration Rights Agreement:  On July 7, 2008, Glencore Investment Pty and the Company entered into a Registration Rights Agreement, containing customary terms and conditions (the "Registration Rights Agreement"), pursuant to which the Company has agreed to register the Series A Preferred Shares for resale by the Reporting Persons and their affiliates and any of their respective pledgees.  Sales under the Registration Rights Agreement must be made in open market transactions that comply with Rule 144 under the Securities Act of 1933, as amended, or in widely distributed public offerings.  The Reporting Persons, their affiliates and any of their respective pledgees are entitled to demand up to six registrations from and after November 5, 2008 and subject to certain customary restrictions, may at any time participate in registered offerings initiated by the Company for its own account or the account of other stockholders.
Under the Certificate of Designation, Series A Preferred Shares sold under the Registration Rights Agreement will automatically convert to shares of Common Stock upon such sale.  Subject to the restriction on the number of demand registrations, the registration rights will continue until the Common Stock issued upon conversion of the Series A Preferred Shares are sold under an effective registration statement or the Series A Preferred Shares are no longer outstanding.  The Company will be responsible for all fees and expenses relating to any registration of the Series A Preferred Shares, except that the Reporting Persons will be responsible for any underwriters commissions and any fees and expenses of their legal counsel and any other advisors retained by them (including underwriters' counsel in the case of demand registrations).

Support Agreement: The Company disclosed in its notice of Annual Meeting of Stockholders held on May 27, 2009 and related proxy statement a management proposal to amend the Company's Restated Certificate of Incorporation to increase the number of authorized shares of Common Stock.  Following filing of the proxy statement, Glencore AG and the Company engaged in discussions relating to the proposed increase in the Company's authorized capital.  The Company determined to amend the proposal to provide for an increase in the number of authorized shares of Common Stock from 100,000,000 to 195,000,000, and on May 4, 2009, the Company and Glencore AG entered into a Support Agreement (the "Support Agreement") whereby (a) Glencore AG agreed to vote for the amended proposal to increase authorized capital and the other matters being proposed by the Company for approval at the May 27, 2009 stockholders meeting, and (b) except for certain limited and strategic transactions and other customary exceptions, the Company agreed to give the Reporting Persons the right to maintain their equity percentage ownership in the Company by purchasing (i) their pro rata portion of additional shares of Common Stock and other securities or interests convertible into or exchangeable or exercisable for Common Stock (including cash settled derivatives) issued by the Company and its affiliates in cash offerings and (ii) additional shares of Common Stock and other securities or interests convertible into or exchangeable or exercisable for Common Stock (including cash settled derivatives) issued by the Company and its affiliates in any debt exchange offers if and to the extent the aggregate cumulative number of shares of Common Stock or their equivalent issued in debt exchanges in any twelve month period prior to November 4, 2010 would equal or exceed 30 million shares.  The right to acquire securities will terminate if the Reporting Persons beneficially own (within the meaning of Rule13d-3) less than 10% of the Common Stock for a period of three continuous months.

Irrevocable Proxies: On September 14, 2017, Glencore AG granted to the Chief Accounting Officer and the Treasurer of the Company a five-year irrevocable proxy (the "2017 Glencore Irrevocable Proxy") to vote, as directed by Glencore AG, all shares of Common Stock that Glencore AG owns of record from time to time, provided that the proxies must limit the number of such shares they vote on each matter submitted to the stockholders such that the number of such shares they vote, when added to other shares that Glencore AG and its affiliates have the right to vote (including the Specified Shares), do not equal or exceed 50% of the total number of shares voted by all stockholders. The Glencore Irrevocable Proxy expired in accordance with its terms on September 14, 2022. On March 23, 2023, the Reporting Persons granted to the Chief Accounting Officer and the Treasurer of the Company a five-year irrevocable proxy (the "2023 Glencore Irrevocable Proxy") on the same terms as the 2017 Glencore Irrevocable Proxy.

Security Deeds: On December 1, 2023, Glencore International and Glencore AG together pledged 39,655,115 shares of Common Stock in aggregate (the "Pledged Shares") to HSBC Bank PLC as lender, to secure a revolving loan facility made available to Glencore International (the "2023 Credit Facility"). The 2023 Credit Facility remains available until terminated by the lender. The 2023 Credit Facility and the related deeds of security pursuant to which each of the pledgors granted the pledge of the Pledged Shares owned by it (the "2023 Security Deeds") contain covenants, events of default and other terms and conditions customary for facilities of this type. Glencore International's obligations under the 2023 Credit Facility are guaranteed by Glencore plc.  The number of Pledged Shares was reduced as a result of the sale of the Subject Shares.

The foregoing descriptions of the Certificate of Designation, Governance Agreement, Registration Rights Agreement, Support Agreement, 2017 Glencore Irrevocable Proxy, 2023 Glencore Irrevocable Proxy and 2023 Security Deeds do not purport to be complete and are subject to, and qualified in their entirety by reference to, the full text of such instruments and agreements, which are filed herewith or were previously filed with the Securities and Exchange Commission as exhibits to this Statement, and are hereby incorporated herein by reference. Except for terms of such instruments and agreements, to the best knowledge of the Reporting Persons, there exists no contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such persons and any person with respect to any securities of the Company, including but not limited to the transfer or voting of any securities of the Company, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Glencore International AG

**Signature:** /s/ John Burton

**Name/Title:** John Burton/Authorised Signatory

**Date:** 11/11/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Glencore plc

**Signature:** /s/ John Burton

**Name/Title:** John Burton/Authorised Signatory

**Date:** 11/11/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Glencore AG

**Signature:** /s/ John Burton

**Name/Title:** John Burton/Authorised Signatory

**Date:** 11/11/2025