Welcome to our dedicated page for Century Alum Co SEC filings (Ticker: CENX), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
This page provides access to U.S. Securities and Exchange Commission filings for Century Aluminum Company (NASDAQ: CENX), an integrated producer of bauxite, alumina and primary aluminum products headquartered in Chicago, Illinois. Century Aluminum’s common stock is listed on the Nasdaq Global Select Market, and the company files annual, quarterly and current reports that detail its operations, financial condition, capital structure and material events.
Century Aluminum’s SEC filings include annual reports on Form 10-K and quarterly reports on Form 10-Q, which present audited and unaudited financial statements, risk factors, management’s discussion and analysis and other disclosures. Investors can review information on net sales to related parties and other customers, aluminum shipments, cost of goods sold, gross profit, operating income, interest expense, derivative contract results, liquidity and debt obligations. These filings also describe the company’s integrated operations in the United States, Iceland, the Netherlands and Jamaica and its position as the largest producer of primary aluminum in the United States.
Current reports on Form 8-K provide timely updates on specific events. Recent 8-K filings have covered quarterly earnings announcements, an electrical equipment failure at the Grundartangi aluminum smelter in Iceland, the pricing and closing of 6.875% Senior Secured Notes due 2032, and amendments to Century Aluminum’s loan and security agreement. These filings describe the terms of the senior secured notes, related guarantees and collateral, the use of proceeds to refinance existing notes and repay credit facilities, and changes to the company’s credit facility maturity and other terms.
Through this filings page, users can also review exhibits such as indentures, security agreements, collateral agency agreements and credit facility amendments that define Century Aluminum’s debt structure and covenant framework. AI-powered tools on the platform can summarize lengthy documents, highlight key terms in 10-K and 10-Q reports, and explain complex financing arrangements and risk disclosures in plain language, helping users interpret the implications of Century Aluminum’s SEC filings for its CENX stock.
Glencore has updated its ownership in Century Aluminum following a sizable share sale. On March 4, 2026, Glencore International sold 6,315,245 Century common shares in a Rule 144 block trade at $51.75 per share, monetizing part of its long‑held investment.
After this sale, Glencore AG directly owns 17,505,947 shares, or 17.68% of Century’s outstanding stock, while Glencore plc and Glencore International together beneficially own 29,690,702 shares, or 29.99%, based on 98,969,007 shares outstanding as of December 31, 2025. Glencore states it remains confident in Century’s management and outlook, intends to hold its position for investment purposes, but may buy or sell additional shares and could engage in strategic discussions with the company and other stakeholders.
Century Aluminum Company executive Agust F. Hafberg, the SVP & Chief Commercial Officer, reported an open-market sale of 22884 shares of common stock on February 27, 2026 at $51.24 per share.
After this transaction, he directly holds 45059 shares, which the filing notes include unvested restricted stock units granted under the company’s long-term incentive plans.
Century Aluminum Company files a comprehensive annual report that restates prior financial statements after changing how it consolidates its 55% Jamalco joint venture; the restatement does not change net income attributable to Century stockholders. The company reports 2025 aluminum production of 638,000 tonnes versus 770,000 tonnes of capacity and discloses an adverse opinion on internal control over financial reporting.
Century highlights a new joint development agreement with Emirates Global Aluminium to build a 750,000‑tonne‑per‑year primary aluminum smelter in Inola, Oklahoma, where Century will own 40%. It also completed the $200 million sale of its idled Hawesville, Kentucky site for cash and a 6.8% minority interest in a planned data center project, and notes a transformer failure that has temporarily cut output at its Grundartangi, Iceland smelter by about two‑thirds. Customer concentration remains high, with Glencore accounting for 54% of 2025 sales and owning 36.4% of Century’s common stock.
Century Aluminum Company is changing how it accounts for its 55% interest in the Jamalco joint venture, moving from proportionate consolidation to fully consolidating the Jamalco production assets with higher noncontrolling interest. This change follows SEC staff comment letters on prior filings.
The company determined this accounting change is material and concluded that its previously issued consolidated financial statements for 2023, 2024 and several interim periods should no longer be relied upon and will be restated. The change increases total assets and total equity, while gross profit is reduced by less than 10% in each affected period, but net income attributable to Century stockholders and total stockholders’ equity are unchanged.
Century Aluminum expects to report a material weakness in internal control over financial reporting in connection with these restatements. The impacts and corrected figures are to be reflected in its 2025 Form 10-K, and recent Q4 2025 unaudited results already incorporate the new accounting.
Century Aluminum Company notified the SEC it could not timely file its Annual Report on Form 10-K for the period ended December 31, 2025 because it changed the accounting treatment for its Jamalco joint venture production assets (the Jamalco Production Assets) from proportionate consolidation to full consolidation.
The company says it has reflected the Accounting Change in unaudited results in its Q4 2025 Earnings Release and resolved a related Staff comment; the change increases Total assets, Noncontrolling interests and Total equity, reduces Gross profit (by less than 10% in each period presented) due to higher depreciation and amortization, and does not affect Net income attributable to Century Stockholders, adjusted EBITDA, debt covenant compliance or executive compensation. The company expects to file the 2025 Form 10-K promptly.
Century Aluminum Company executive vice president of global operations Gunnar Gudlaugsson reported an open-market sale of common stock. On February 25, 2026, he sold 43,000 shares at $54.10 per share. After this transaction, he held 136,393 shares, which the disclosure notes include unvested restricted stock units granted under the company’s long-term incentive plans.