Company: CENX
Filing Date: 2025-04-25
Form Type: DEFA14A
Source: 0001552781-25-000154
Chunk: 1

Company: CENTURY ALUMINUM CO
Filing Date: 2025-04-25
Form: DEFA14A
Chunk 1
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) by requesting prior to June 2,
2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com,
(2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated
below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting* June
16, 2025 8:30 a.m. Central Time Hyatt Place Chicago 28 North Franklin Street Chicago, Illinois 60606 2025 Annual Meeting Vote by June
15, 2025 11:59 p.m. ET. For shares held in a Plan, vote by June 11, 2025 11:59 p.m. ET.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”.
V73993-P27858 Voting Items Board Recommends THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming
stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. Election of Directors For
Nominees: 01) Jarl Berntzen 02) Jennifer Bush 03) Jesse Gary 04) Errol Glasser 05) Wilhelm van Jaarsveld 06) Andrew Michelmore 07) Tamla
Olivier 2. Proposal to ratify the appointment of Deloitte & Touche LLP as the Company’s independent registered accounting firm
for the fiscal year ending December 31, 2025. For 3. Proposal to approve, on an advisory basis, the compensation of the named executive
officers. For 4. Proposal to approve the 2025 Century Aluminum Company Incentive Plan. For NOTE: By execution of this Proxy Card, the
undersigned hereby authorizes the proxies to vote, in their discretion, on any other business that may properly be brought before the
meeting or any postponement thereof.