Company: CENX
Filing Date: 2025-06-09
Form Type: DEFA14A
Source: 0001104659-25-057845
Chunk: 0

Company: CENTURY ALUMINUM CO
Filing Date: 2025-06-09
Form: DEFA14A
Chunk 0
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<div align='center'>SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934</div>

| Filed by the Registrant x                    |                                                                                 |
| Filed by a Party other than the Registrant o |                                                                                 |
| Check the appropriate box:                   |                                                                                 |
| o                                            | Preliminary Proxy Statement                                                     |
| o                                            | Definitive Proxy Statement                                                      |
| x                                            | Definitive Additional Materials                                                 |
| o                                            | Soliciting Material Pursuant to § 240.14a-12                                    |
| o                                            | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |

<div align='center'>CENTURY ALUMINUM COMPANY

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

| Payment of Filing Fee (Check the appropriate box): |                                                                                                      |
| x                                                  | No fee required.                                                                                     |
| o                                                  | Fee paid previously with preliminary materials.                                                      |
| o                                                  | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |

Century Aluminum Company Say - on - Pay Outreach Spring 2025

1 • Century Aluminum’s incentive programs for executives have been designed with the following principles in mind: 1. Encourage value creation at all stages of our business cycle to reward achievement of critical strategic initiatives 2. Consist of majority performance - based incentives that are aligned to the shareholder experience 3. Be sensitive that the Company’s financial performance is strongly dependent on commodity pricing and that management performance and compensation outcomes should also focus on areas within management control such as operational efficiency and long - term value creating strategic initiatives • As a result of the above, we utilize a multi - pronged approach for our annual incentive program (“AIP”) and performance stock units (“PSUs”) to follow our pay - for - performance philosophy: – 70% of our AIP focuses on eight Company - wide financial, operational, and safety metrics (“FOS Metrics”) that emphasizes operational efficiency and our strategic priorities, rather than directly measuring profit – 30% of our AIP is based on individual performance to differentiate based on direct areas of responsibility