| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Calloway Kenneth L | SVP, Human Resources | C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DRIVE, SUITE 1000, CHICAGO | /s/ Paul Sharobeem, attorney-in-fact for Kenneth L. Calloway | 23 Sep 2025 | 0002014963 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CENX | Common Stock | Sale | $452,375 | -16,450 | -36% | $27.50 | 28,706 | 19 Sep 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Includes unvested RSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans. |