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.
Century Aluminum Co. filings document the regulatory record of a Nasdaq-listed primary aluminum producer, including earnings-related Form 8-K reports, annual meeting proxy materials and material-event disclosures. The filings cover operating results, aluminum shipments, liquidity, non-GAAP measures, common stock registration details and governance matters presented to shareholders.
Recent disclosures also address accounting treatment for the Jamalco Production Assets, related non-reliance and late-filing notices, and material agreements involving subsidiary asset sales. The filing record ties these items to Century's aluminum operations, consolidation policies, board oversight, capital structure and public-company reporting obligations.
Century Aluminum senior vice president and chief accounting officer Robert F. Hoffman sold 10,000 shares of common stock in an open-market transaction on March 4, 2026, at a weighted average price of $56.33 per share, with individual trades ranging from $56.15 to $56.50.
After the sale, he directly owned 67,172 shares, which include unvested restricted stock units, and had an additional 14.5476 shares held indirectly through a 401(k) plan as reported by the plan trustee.
Century Aluminum Company senior vice president Matt Aboud reported selling a total of 15,097 shares of common stock in open-market transactions. He sold 12,126 shares on March 2, 2026 at a weighted average price of $52.50 per share and 2,971 shares on March 3, 2026 at a weighted average price of $52.67 per share, with actual trade prices falling within disclosed ranges. After these sales, he directly owned 64,843 shares, which include unvested restricted stock units granted under the company’s long-term incentive plans.
Glencore International AG, a major shareholder of Century Aluminum, reported an open-market sale of 6,315,245 shares of common stock at $51.75 per share. After this transaction, Glencore International AG held 12,184,755 shares of Century Aluminum common stock.
The filing also lists Glencore plc and Glencore AG as reporting persons. The footnote explains that the shares sold and held are directly owned by Glencore International AG, while Glencore plc, as its parent, may be deemed an indirect beneficial owner of these securities.
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.