Exhibit 99.1 Century Aluminum Company Reports Fourth Quarter 2023 Results Chicago, February 21, 2024 (GLOBE NEWSWIRE) -- Century Aluminum Company (NASDAQ: CENX) today announced its fourth quarter and full year 2023 results. Fourth Quarter 2023 Highlights • Net sales $512.3 million • Reported net income attributable to Century stockholders of $30.0 million, or $0.30 per diluted share; adjusted net income of $40.0 million1, or $0.39 per share; Adjusted EBITDA attributable to Century stockholders of $57.1 mill ...