Company: CENX
Filing Date: 2025-06-16
Form Type: S-8
Source: 0001104659-25-059865
Chunk: 0

Company: CENTURY ALUMINUM CO
Filing Date: 2025-06-16
Form: S-8
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission
on June 16, 2025</div>

Registration No. 333-________

<div align='center'>UNITED STATESSECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8Registration Statement under
the Securities Act of 1933

CENTURY ALUMINUM COMPANY

(Exact name of registrant as specified in its charter)</div>

| Delaware                                                       
 (State or other jurisdiction of incorporation or organization) |     | 13-3070826                           
 (I.R.S. Employer Identification No.) |

<div align='center'>One South Wacker Drive
Suite 1000
Chicago, Illinois 60606(Address, including zip code of registrant’s principal executive office)

Century Aluminum Company 2025 Incentive Plan(Full title of the plan)

John DeZee
Executive Vice President, General Counsel and Secretary
Century Aluminum Company
One South Wacker Drive, Suite 1000
Chicago, Illinois 60606
(312) 696-3101
(Name, address and telephone number, including area code, of agent for service)</div>

Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of
“large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth
company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer | x |     | Accelerated filer         | ¨ |
| Non-Accelerated filer   | ¨ |     | Smaller reporting company | o |
|                         |   |     | Emerging growth company   | o |

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 7(a)(2)(B) of the Securities Act.o

<div align='center'>Explanatory Note</div>

This Registration Statement relates to the registration of shares of common stock, $0.01 par value per share (the “Common Stock”), of Century Aluminum Company (the “Company”) that may be offered from time to time under the Company’s 2025 Incentive Plan (the “Plan”).Pursuant to