Company: CENX
Filing Date: 2025-06-09
Form Type: DEFA14A
Source: 0001104659-25-057845
Chunk: 3

Company: CENTURY ALUMINUM CO
Filing Date: 2025-06-09
Form: DEFA14A
Chunk 3
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 were used in FY24 to create a balanced and comprehensive view of management performance (five operational and three safety metrics) Relative TSR PSUs • The 2 - year performance period portion of the FY22 - 24 PSUs contributed to a lower earnout than if a single, 3 - year performance period was used (the 2 - year payout was 91.2% and the 3 - year payout was 200%, for a total earnout of 145.6% of target) • The Strategic Objective Modifier was utilized only for the FY20 - 22 PSUs, which increased the earnout by 9%, remaining well below target (65% of target); there were no adjustments for the FY21 - 23 (21.3% of target earnout) or FY22 - 24 PSUs (145.6% of target earnout) • The Strategic Objective Modifier is based on a tiered set of strategic priorities approved by the Committee at the outset of the performance period • The four - company r elative TSR comparator group is intentional to compare Century’s shareholder experience to the other public primary aluminum companies impacted by the price of aluminum for the purest performance comparison • Our CEO’s 2024 target pay is aligned with performance and is conservatively positioned versus CEO pay at our executive compensation benchmarking peers (has been set meaningfully below the median for the entirety of his tenure as CEO, though the gap to median has narrowed over time) • 2024 target TDC was $5.35M , well below the $8.0M reported pay in the Summary Compensation Table due largely to superior performance leading to an above target 2024 bonus and the final payment of the CEO’s 2021 - approved cash promotion payments • CEO cash promotion payments were fully described in the Form 8 - K (dated 5/17/2021) and in subsequent proxy statements, with ISS recommending “For” in 2022 and 2023 • Century would have scored a “Low Concern” on ISS’ quantitative tests absent the cash promotion payments, which were granted in 2021 and approved by shareholders through subsequent say - on - pay votes

5 We Request Your Support at the 2025 Annual Meeting A vote FOR the Election of the Seven Director Nominees Named in Century Aluminum Company’s 2025 Proxy Statement A vote FOR the Ratification of Deloitte & Touche LLP as Our Independent Registered Public Accounting Firm for 2025 A vote FOR the Approval of the Advisory Resolution