| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Gary Jesse E | President and CEO, Director | C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DRIVE, SUITE 1000, CHICAGO | /s/ Paul Sharobeem, attorney-in-fact for Jesse E. Gary | 05 Jan 2026 | 0001568817 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CENX | Common Stock | Award | $0 | +439,090 | +120% | $0.000000 | 805,237 | 31 Dec 2025 | Direct | F1 |
| transaction | CENX | Common Stock | Tax liability | $7,958,673 | -203,131 | -25% | $39.18 | 602,106 | 31 Dec 2025 | Direct | F2 |
| transaction | CENX | Common Stock | Tax liability | $2,652,917 | -67,711 | -11% | $39.18 | 534,395 | 31 Dec 2025 | Direct | F3 |
| transaction | CENX | Common Stock | Award | $0 | +57,443 | +11% | $0.000000 | 591,838 | 01 Jan 2026 | Direct | F4, F5 |
| holding | CENX | Common Stock | 127,969 | 31 Dec 2025 | By Trust | F6 |
| 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. |
| F6 | Shares held in a self-settled, revocable trust for which the Reporting Person serves as trustee. |