# EDGAR Filing Document

**Accession Number:** 0001032383
**File Stem:** 0001104659-25-111519
**Filing Date:** 2025-11
**Character Count:** 19108
**Document Hash:** ad971409e228175c7725db909e72d1d5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-111519.hdr.sgml**: 20251113

**ACCESSION NUMBER**: 0001104659-25-111519

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20251110

**FILED AS OF DATE**: 20251113

**DATE AS OF CHANGE**: 20251113

**REPORTING-OWNER**: 

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

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34474
- **FILM NUMBER:** 251480151

**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
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Glencore plc
- **CENTRAL INDEX KEY:** 0001521365
- **STANDARD INDUSTRIAL CLASSIFICATION:** UNKNOWN SIC - 8880 [8880]
- **ORGANIZATION NAME:** International Corp Fin
- **STATE OF INCORPORATION:** Y9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34474
- **FILM NUMBER:** 251480149

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** BAARERMATTSTRASSE 3
- **CITY:** BAAR
- **PROVINCE COUNTRY:** V8
- **ZIP:** CH-6341
- **BUSINESS PHONE:** 41 41 709 2000

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** BAARERMATTSTRASSE 3
- **CITY:** BAAR
- **PROVINCE COUNTRY:** V8
- **ZIP:** CH-6341

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Glencore Xstrata plc
- **DATE OF NAME CHANGE:** 20130606

**FORMER NAME:**
- **FORMER CONFORMED NAME:** GLENCORE INTERNATIONAL PLC
- **DATE OF NAME CHANGE:** 20110520
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Glencore AG
- **CENTRAL INDEX KEY:** 0001449539

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** V8
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34474
- **FILM NUMBER:** 251480150

**BUSINESS ADDRESS:**
- **STREET 1:** BAARERMATTSTRASSE 3
- **STREET 2:** P.O. BOX 1301
- **CITY:** BAAR
- **STATE:** V8
- **ZIP:** CH-6341
- **BUSINESS PHONE:** 41 41 709 2512

**MAIL ADDRESS:**
- **STREET 1:** BAARERMATTSTRASSE 3
- **STREET 2:** P.O. BOX 1301
- **CITY:** BAAR
- **STATE:** V8
- **ZIP:** CH-6341
**ISSUER**: 

**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

**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

## 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]*

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>GLENCORE INTERNATIONAL AG<br><sub>(Last) (First) (Middle)</sub><br>BAARERMATTSTRASSE 3<br>P.O. BOX 1363<br><sub>(Street)</sub><br>BAAR, V8 CH-6341<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-10 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>CENTURY ALUMINUM CO [ CENX ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Glencore AG<br><sub>(Last) (First) (Middle)</sub><br>BAARERMATTSTRASSE 3<br>P.O. BOX 1363<br><sub>(Street)</sub><br>BAAR, V8 CH-6341<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-10 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>CENTURY ALUMINUM CO [ CENX ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Glencore plc<br><sub>(Last) (First) (Middle)</sub><br>BAARERMATTSTRASSE 3<br>P.O. BOX 1363<br><sub>(Street)</sub><br>BAAR, V8 CH-6341<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-11-10 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>CENTURY ALUMINUM CO [ CENX ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-11-10 |  | S |  | 9000000 | D | $30.25 | 18500000 | D |  |
| Common Stock | 2025-11-10 |  | C |  | 4948591<sup>(1)</sup> | A | <sup>(2)</sup> | 17505947 | I | See Footnote<sup>(3)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Series A Convertible Preferred Stock | <sup>(2)</sup> | 2025-11-10 |  | C |  |  | 49485.91 | <sup>(2)</sup> | <sup>(2)</sup> | Common Stock | 4948591<sup>(1)</sup> | <sup>(2)</sup> | 0 | I | See Footnote<sup>(3)</sup> |

---

### Footnotes:

(1) 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.

(2) 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 acquired on July 8, 2008 and has no expiration date.

(3) The shares of Common Stock reported in Line 2 of Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and may be deemed to be indirectly beneficially owned by Glencore International AG. The Common Stock reported on Line 1 of Table I is held directly by Glencore International AG. Glencore International AG is wholly-owned by Glencore plc, which may be deemed an indirect beneficial owner of the securities held by Glencore AG and Glencore International AG.

**Remarks:**
Exhibit List: Exhibit 24.1 and Exhibit 24.2.

**Signature:** GLENCORE INTERNATIONAL AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact  
**Date:** 2025-11-13

**Signature:** GLENCORE AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact  
**Date:** 2025-11-13

**Signature:** GLENCORE PLC By: /s/ John Burton Name: John Burton Title: Company Secretary  
**Date:** 2025-11-13

### Remarks:

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.**