| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Hoffman Robert F | SVP, IT and CAO | C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DRIVE, SUITE 1000, CHICAGO | /s/ Paul Sharobeem, attorney-in-fact for Robert F. Hoffman | 05 Jan 2026 | 0001603836 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CENX | Common Stock | Award | $0 | +31,650 | +54% | $0.000000 | 90,733 | 31 Dec 2025 | Direct | F1 |
| transaction | CENX | Common Stock | Tax liability | $487,987 | -12,455 | -14% | $39.18 | 78,278 | 31 Dec 2025 | Direct | F2 |
| transaction | CENX | Common Stock | Tax liability | $244,013 | -6,228 | -8% | $39.18 | 72,050 | 31 Dec 2025 | Direct | F3 |
| transaction | CENX | Common Stock | Award | $0 | +5,122 | +7.1% | $0.000000 | 77,172 | 01 Jan 2026 | Direct | F4, F5 |
| Id | Content |
|---|---|
| F1 | Represents shares of common stock acquired by the Reporting Person upon the vesting of PSUs granted in connection with the Issuer's 2023-2025 Long-Term Incentive Plan under Rule 16b-3(d). |
| F2 | Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of PSUs granted to the Reporting Person. |
| F3 | Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of RSUs previously granted to the Reporting Person on January 1, 2023. |
| F4 | Represents RSUs granted to the Reporting Person in connection with the Issuer's 2026-2028 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest on December 31, 2028, subject to the Plan's terms and conditions. |
| F5 | Includes unvested RSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans. |