Company: CENX
Filing Date: 2025-03-03
Form Type: 10-K
Source: 0000949157-25-000024
Chunk: 150

Company: CENTURY ALUMINUM CO
Filing Date: 2025-03-03
Form: 10-K
Item: Item 8
Chunk 150
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retirement benefit plans: Pension BenefitsOPEB Benefits2025$20.5 $6.5 202620.9 6.5 202720.9 6.5 202821.4 6.7 202921.7 6.5 2030 – 203494.8 30.9 Participation in Multi-employer Pension PlansThe union-represented employees at Hawesville are part of a United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union ("USWA") sponsored multi-employer plan. Our contributions to the plan are determined at a fixed rate per hour worked. Currently, we do not have any plans to withdraw from or curtail participation in this plan. The risks of participating in a multi-employer plan are different from single-employer plans in the following respects:•Assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers.•If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.•If a participating employer chooses to stop participating in a multi-employer plan, the employer may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability.Century’s participation in the plan for the year ended December 31, 2024, is outlined in the table below.FundSteelworkers Pension TrustEIN / PN23-6648508 / 499Pension Protection Act Zone Status 2023 (1) Green Pension Protection Act Zone Status 2022 (1) Green Subject to Financial Improvement/Rehabilitation Plan (2) No Contributions of Century Aluminum 2024$0.04Contributions of Century Aluminum 2023$0.2Contributions of Century Aluminum 2022$1.6Withdrawal from Plan ProbableNoSurcharge Imposed No Expiration Date of Collective Bargaining Agreement (2)March 31, 2026(1)The most recent Pension Protection Act zone status available in 2024 and 2023 is for the plan's year-end December 31, 2023 and December 31, 2022, respectively. The zone status is based on information that Century received from the plan as well as publicly available information per the Department of Labor and is certified by the plan’s actuary. Among other factors, plans