Company: CENX
Filing Date: 2025-11-21
Form Type: 8-K/A
Source: 0001628280-25-053603
Chunk: 2

Company: CENTURY ALUMINUM CO
Filing Date: 2025-11-21
Form: 8-K/A
Chunk 2
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 The earnings call will be webcast live on the Company’s website, located at www.centuryaluminum.com. Anyone interested in listening to the live webcast should plan to begin the registration process for the webcast at least 10 minutes before the live call is scheduled to begin. A replay of the webcast and associated presentation materials will be archived and available for replay approximately two hours following the live call.

The information in this Current Report and Exhibit 99.1 attached hereto shall not be deemed “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 in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

### Item 9.01. Financial Statements and Exhibits.
(d) Exhibits

| Exhibit Number 
 99.1           |     | Description                                                                 
 Press Release dated November 6, 2025                                        |
|:---------------|:----|:----------------------------------------------------------------------------|
| 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.

| Date: |     | November 21, 2025 |     | By: | CENTURY ALUMINUM COMPANY 
 /s/ PETER TRPKOVSKI      |     |                                                                 |
|:------|:----|:------------------|:----|:----|:-------------------------|:----|:----------------------------------------------------------------|
|       |     |                   |     |     | Name:                    |     | Peter Trpkovski                                                 |
|       |     |                   |     |     | Title:                   |     | Executive Vice President, Chief Financial Officer and Treasurer 
 (Principal Financial Officer)                                   |