Century Aluminum reports annual meeting results: all director nominees elected, auditor ratified

Proposal No. 2: Ratification of Appointment of Independent Registered Public Accounting Firm The stockholders ratified the appointment of Deloitte & Touche LLP as the independent registered public accounting firm for the Company for the year ending December 31, 2026 as follows: For Against Abstain Broker Non-Votes 84,373,696 1,093,762 46,001 -

Proposal No. 1: Election of Jarl Berntzen, Jennifer Bush, Jesse Gary, Errol Glasser, Wilhelm van Jaarsveld, Andrew Michelmore, and Tamla Olivier to the Company's Board of Directors The seven persons nominated to serve as directors of the Company received the following number of votes and were elected as directors to serve a one-year term expiring at the annual meeting of stockholders in 2027: Nominee For Withheld Broker Non-Votes Jarl Berntzen 73,199,876 6,929,724 5,383,859 Jennifer Bush 73,403,274 6,726,326 5,383,859 Jesse Gary 79,851,676 277,924 5,383,859 Errol Glasser 71,339,258 8,790,342 5,383,859 Wilhelm van Jaarsveld 79,479,782 649,818 5,383,859 Andrew Michelmore 73,532,131 6,597,469 5,383,859 Tamla Olivier 73,382,629 6,746,971 5,383,859

Proposal No. 3: Advisory Vote on the Compensation of Named Executive Officers The stockholders approved, through a non-binding advisory vote, the compensation of the Company's named executive officers as described in the Company's proxy statement as follows: For Against Abstain Broker Non-Votes 79,589,386 494,275 45,939 5,383,859