Company: CENX
Filing Date: 2025-05-08
Form Type: 10-Q
Source: 0000949157-25-000035
Chunk: 5

Company: CENTURY ALUMINUM CO
Filing Date: 2025-05-08
Form: 10-Q
Item: Part II, Item 1A
Chunk 5
---
 Section 906) by Chief Executive OfficerX32.2Section 1350 Certification (pursuant to Sarbanes-Oxley Section 906) by Principal Financial OfficerX101.INSXBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document101.SCHInline XBRL Taxonomy Extension SchemaX101.CALInline XBRL Taxonomy Extension Calculation LinkbaseX101.DEFInline XBRL Taxonomy Extension Definition LinkbaseX101.LABInline XBRL Taxonomy Extension Label LinkbaseX101.PREInline XBRL Taxonomy Extension Presentation LinkbaseX104Cover Page Interactive Data File (embedded within the Inline XBRL document)

38

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Century Aluminum CompanyDate:May 8, 2025By:/s/ PETER TRPKOVSKIPeter TrpkovskiExecutive Vice President,  Chief Financial Officer and Treasurer(Principal Financial Officer)Date:May 8, 2025By:/s/ ROBERT HOFFMANRobert HoffmanSenior Vice President, Chief Information Officer and Chief Accounting Officer(Principal Accounting Officer)

39