# EDGAR Filing Document

**Accession Number:** 0000949157
**File Stem:** 0001104659-25-101317
**Filing Date:** 2025-10
**Character Count:** 8467
**Document Hash:** 6034b412e2202abfe2e2ebca995eee7c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-101317.hdr.sgml**: 20251022

**ACCESSION NUMBER**: 0001104659-25-101317

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20251021

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251022

**DATE AS OF CHANGE**: 20251021

**FILER**: 

**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:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34474
- **FILM NUMBER:** 251408096

**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

?xml version='1.0' encoding='ASCII'?

 **UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT** 

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

Date of report (Date of earliest event reported): October 21, 2025

![](tm2529215d1_8kimg001.jpg)

**Century Aluminum Company**

(Exact Name of Registrant as Specified in Charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-34474** | **13-3070826** |
| (State or Other Jurisdiction of Incorporation) | (Commission File Number) | (IRS Employer Identification No.) |

---

---

| | |
|:---|:---|
| **One South Wacker Drive** |  |
| **Suite 1000** |  |
| **Chicago,** **Illinois** | **60606** |
| (Address of Principal Executive Offices) | (Zip Code) |
| **(312)** **696-3101** | **(312)** **696-3101** |
| (Registrant's telephone number, including area code) | (Registrant's telephone number, including area code) |
| **N/A** | **N/A** |
| (Former Name or Former Address, if Changed Since Last Report) | (Former Name or Former Address, if Changed Since Last Report) |

---

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

---

| |
|:---|
| Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

---

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| Title of each class: | Trading Symbol(s) | Name of each exchange on which registered: |
| **Common Stock, $0.01 par value per share** | **CENX** | **Nasdaq Stock Market LLC** |
|  |  | **(Nasdaq Global Select Market)** |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b– 2 of the Securities Exchange Act of 1934 (§ 240.12b–2 of this chapter).

Emerging growth company ◻

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

**Item 7.01. Regulation FD Disclosure.**

On October 21, 2025, Century Aluminum Company (the "Company") issued a press release announcing an electrical equipment failure at the Company's Grundartangi, Iceland aluminum smelter. A copy of the press release is attached hereto as Exhibit 99.1.

The information provided pursuant to this Item 7.01, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in any such filing.

**Item 9.01. Financial Statements and Exhibits.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(d) Exhibits**

Exhibit Number Description <br> [99.1](tm2529215d1_ex99-1.htm) [Press Release of Century Aluminum Company dated October 21, 2025](tm2529215d1_ex99-1.htm) <br> 104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  |  | **CENTURY ALUMINUM COMPANY** |
| Date: October 21, 2025 | By: | /s/ Peter Trpkovski |
|  | Name: | Peter Trpkovski |
|  | Title: | Executive Vice President, Chief Financial Officer and Treasurer |

---

## Exhibit 99.1

**Exhibit 99.1**

**Century Aluminum Reports Electrical Equipment Failure Affecting One Potline at Grundartangi, Iceland Smelter**

CHICAGO, October 21, 2025 (GLOBE NEWSWIRE) -- Norðurál Grundartangi ehf, a wholly-owned subsidiary of Century Aluminum Company (NASDAQ:CENX), announced today that it was forced to temporarily stop production on one of its two potlines due to an electrical equipment failure at the Grundartangi, Iceland aluminum smelter. No injuries have occurred.

As a result, production at the smelter has been temporarily reduced by approximately two-thirds. Grundartangi's other potline remains unaffected and in full production. An impact assessment and a timeline for obtaining replacement equipment and restoring full production is underway. The company will provide an update on its quarterly earnings conference call on November 6.

Century expects that losses arising from these events will be covered under its property and business interruption insurance policies. Century is working with affected customers and suppliers to minimize the impact to their respective businesses.

**About Century Aluminum**

Century Aluminum is an integrated producer of bauxite, alumina, and primary aluminum products. Century is the largest producer of primary aluminum in the United States, and operates production facilities in Iceland, the Netherlands and Jamaica. Visit <u>www.centuryaluminum.com</u> for more information.

**Cautionary Statement**

Where we express an expectation or belief as to future events or results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, our forward-looking statements are based on current expectations and assumptions that are subject to risks and uncertainties which may cause actual results to differ materially from future results expressed, projected, or implied by those forward-looking statements. Important factors that could cause actual results and events to differ from those described in such forward-looking statements can be found in the risk factors and forward-looking statements cautionary language contained in our Annual Report on Form 10-K, our Quarterly Reports on Form 10-Q and in other filings made with the Securities and Exchange Commission. Although we have attempted to identify those material factors that could cause actual results or events to differ from those described in such forward-looking statements, there may be other factors that could cause actual results or events to differ from those anticipated, estimated or intended. Many of these factors are beyond our ability to control or predict. Given these uncertainties, the reader is cautioned not to place undue reliance on our forward-looking statements. We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events, or otherwise.

**Investor Contact**<br> Ryan Crawford, <u>investorrelations@centuryaluminum.com</u><br> 312-696-3132

**Media Contact**<br> Tawn Earnest, <u>Tawn.earnest@centuryaluminum.com</u><br> 614-698-6351