X0206 3 2024-09-01 0 0000949157 CENTURY ALUMINUM CO CENX 0002035762 Brainerd Theresa L C/O CENTURY ALUMINUM COMPANY 1 S. WACKER DRIVE, SUITE 1000 CHICAGO IL 60606 0 1 0 0 Global Corporate Controller Common Stock 19445 D Includes the following: (i) 3,733 unvested Time Vested Stock Units ("TVSUs") granted to the Reporting Person pursuant to the Issuer's 2022-2024 Long-Term Incentive Plan, all of which will vest on December 31, 2024; (ii) 6,670 unvested TVSUs granted to the Reporting Person pursuant to the Issuer's 2023-2025 Long-Term Incentive Plan, all of which will vest on December 31, 2025; and (iii) 9,042 unvested TVSUs granted to the Reporting Person pursuant to the Issuer's 2024-2026 Long-Term Incentive Plan, all of which will vest on December 31, 2026. /s/ Paul Sharobeem, as attorney in fact for Theresa L. Brainerd 2024-09-03 a20240827poasection16_fi