# EDGAR Filing Document

**Accession Number:** 0000949157
**File Stem:** 0001104659-25-065039
**Filing Date:** 2025-7
**Character Count:** 10574
**Document Hash:** 35d95faf924b83e4f1728a25dd934e06
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-065039.hdr.sgml**: 20250702

**ACCESSION NUMBER**: 0001104659-25-065039

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250702

**DATE AS OF CHANGE**: 20250702

**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:** 251098390

**BUSINESS ADDRESS:**
- **STREET 1:** BAARERMATTSTRASSE 3
- **STREET 2:** P O BOX 555 CH 6341 BAAR
- **CITY:** SWITZERLAND
- **BUSINESS PHONE:** 4142227722

**MAIL ADDRESS:**
- **STREET 1:** BAARERMATTSTRASSE 3
- **STREET 2:** P O BOX 555 CH 6341 BAAR
- **CITY:** SWITZERLAND
**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:** 251098388

**BUSINESS ADDRESS:**
- **STREET 1:** BAARERMATTSTRASSE 3
- **CITY:** BAAR
- **STATE:** V8
- **ZIP:** CH-6341
- **BUSINESS PHONE:** 41 41 709 2000

**MAIL ADDRESS:**
- **STREET 1:** BAARERMATTSTRASSE 3
- **CITY:** BAAR
- **STATE:** 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:** 251098389

**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

### 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>2025-06-30 | **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>2025-06-30 | **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>2025-06-30 | **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 | 2025-06-30 |  | C |  | 16477 | A | <sup>(1)(2)</sup> | 12554508 | I | See Footnote<sup>(3)</sup> |
| Common Stock |  |  |  |  |  |  |  | 27500000 | D |  |

---

## 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> | 2025-06-30 |  | C |  |  | 164.77 | <sup>(2)</sup> | <sup>(2)</sup> | Common Stock | 16477 | <sup>(2)</sup> | 49514.39 | I | See Footnote<sup>(3)</sup> |

---

### Footnotes:

(1) Represents shares of Common Stock acquired upon conversion of 164.77 shares of Series A Convertible Preferred Stock on June 30, 2025.

(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 has no expiration date.

(3) The shares of Common Stock reported in Line 1 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 2 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.

**Signature:** GLENCORE INTERNATIONAL AG By: /s/ John Burton Name: John Burton Title: Director By: /s/ Steven Kalmin Name: Steven Kalmin Title: Director  
**Date:** 2025-07-02

**Signature:** GLENCORE AG By: /s/ Martin Haering Name: Martin Haering Title: Director By: /s/ Carlos Perezagua Name: Carlos Perezagua Title: Director  
**Date:** 2025-07-02

**Signature:** GLENCORE PLC By: /s/ John Burton Name: John Burton Title: Company Secretary  
**Date:** 2025-07-02

### 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.**