SCHEDULE 13D/A

Century Aluminum Co

Common Stock, $0.01 Par Value · CUSIP: 156431108

Event date: 2026-03-04

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Glencore International AGReported CIK 0001032383

  Shares: 29,690,702.00 · Class: 29.99%

• Glencore plcReported CIK 0001521365

  Shares: 29,690,702.00 · Class: 29.99%

• Glencore AGReported CIK 0001449539

  Shares: 17,505,947.00 · Class: 17.68%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.