| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Hafberg Agust F | SVP & Chief Commercial Officer | C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DRIVE, SUITE 1000, CHICAGO | /s/ Paul Sharobeem, attorney-in-fact for Agust F. Hafberg | 30 Sep 2025 | 0002049924 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CENX | Common Stock | Sale | $264,950 | -9,493 | -15% | $27.91 | 55,260 | 26 Sep 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Includes unvested RSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans. |