Company: CENX
Filing Date: 2025-06-09
Form Type: DEFA14A
Source: 0001104659-25-057845
Chunk: 1

Company: CENTURY ALUMINUM CO
Filing Date: 2025-06-09
Form: DEFA14A
Chunk 1
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 – Our PSUs make up 60% of CEO annual equity grants and 50% for other executives , and measure relative total shareholder return (“TSR”) over two - and three - year performance periods (where the overall payout is the average of the two earnouts), which smooths volatility in earnouts – No PSUs vest until after three years from grant to ensure accountability for stock price performance and sufficient long - term orientation – The PSUs are also subject to the Strategic Objective Multiplier, which allows the Compensation Committee to adjust the final PSU performance level by +/ - 30% based on strategic goals determined at the outset of the performance period and are classified into tiers so that there is an informed determination of performance (rather than fully discretionary) Critical Context for Our Executive Pay Program

2 • Over the last five completed fiscal year’s Century Aluminum’s total shareholder return has outpaced notable comparators such as (i) our closest competitors in our Industry Peer Group , (ii) our proxy compensation peer group , (iii) the S&P 600 and (iv) the S&P 1,500 Superior Shareholder Returns -50.00% 0.00% 50.00% 100.00% 150.00% 200.00% 250.00% 300.00% Century Aluminum Company (NasdaqGS:CENX) - Share Pricing Industry Peer Group Proxy Peer Group S&P 600 S&P 1500 CENX +142% Proxy Peers +127% S&P 1500 +79% Aluminum Industry Peers +39% S&P 600 +38% Jesse Gary appointed CEO on 7/1/21

3 Outpacing Peers on Pay - Versus - Performance • Over the past five completed fiscal years, Century’s Compensation Actually Paid (CAP) value as a percent of Summary Compensation Table (SCT) pay is positioned near 60 th percentile for the CEO • Over the same period, Century’s five - year TSR was positioned near the 90th percentile , indicating favorable alignment with CAP (as a percent of SCT) from a relative standpoint SCT CAP CAP % of Company Value Value SCT ATI $37,871 $93,676 247% 21.6% Carpenter Tech $23,590 $53,372 226% 30.5% Eagle Materials $28,068 $57,970 207% 22.8% Gibraltar Industries $23,755 $23,214 98% 3.1