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Century Aluminum (CENX): Customer Map and Commercial Risk Profile

Century Aluminum produces primary aluminum in the United States and Iceland and monetizes through spot- and contract-based sales of standard and value-added primary aluminum, with regional premiums and product premiums layered on LME-linked prices. The company’s revenue model is highly concentrated and price-exposed: a small number of large buyers drive topline, contracts skew short-term, and feedstock and power relationships create operational leverage.
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Quick read: what matters for investors

Century’s cash flow and near-term valuation are governed by three commercial realities. First, a single trading counterparty (Glencore) accounts for the majority of sales, creating a structural counterparty concentration. Second, contracting is predominantly short-term, limiting revenue visibility and amplifying spot-price sensitivity. Third, alumina sourcing and power arrangements are operationally material—disruptions or contingent obligations in either supply or energy can quickly affect smelter economics. These are not theoretical vulnerabilities; they are documented in public filings and recent commentary.

Customer roster — who buys, supplies, and matters (documented sources)

Below are the customer and counterparty relationships mentioned in Century’s public records and recent commentary. Each entry is a plain-English take with a source reference.

  • Big Rivers Electric Corporation
    Century discloses a contingent obligation tied to the unwind of a contractual arrangement that involved CAKY, Big Rivers and a third party, and references a long-term cost-based power contract with Kenergy (a Big Rivers cooperative member) dating to July 2009. This is an identified contingent liability linked to legacy power arrangements. (Century Aluminum Form 10‑K, FY2024)

  • Jamalco
    Century’s reporting notes Jamalco’s operational response—securing alternative port arrangements—to keep alumina shipments moving while conveyor repairs were underway, underlining the sensitivity of alumina logistics to production continuity. (Century Aluminum Form 10‑K, FY2024)

  • Southwire
    Southwire is explicitly called out in the 2024 filing as one of the customers that exceeded 10% of net sales, with a reported figure of 331.3 in the schedules included in the 10‑K. This marks Southwire as a material buyer on a historical basis. (Century Aluminum Form 10‑K, FY2024)

  • Gramercy refinery (Louisiana)
    Century stated on its 2025 Q4 earnings call that it is the largest customer of the Gramercy alumina refinery and that it sources alumina from a number of third parties—highlighting a mix of captive and market sourcing for a critical feedstock. (Century Aluminum 2025 Q4 earnings call)

  • Glencore plc / Glencore (trading affiliate)
    Glencore bought approximately 59.1% of Century’s consolidated net sales in 2024, and Century has agreements to sell a substantial portion of 2025 production to Glencore; Glencore purchases are priced on the LME plus a Midwest premium and product premiums. This is the most consequential commercial relationship in terms of revenue concentration and price setting. (Century Aluminum Form 10‑K, FY2024)

  • TeraWulf
    Century announced the sale and planned redevelopment of the Hawesville site to TeraWulf; management described the transaction on the 2025 Q4 call and multiple market reports credited the sale with strengthening Century’s balance sheet, citing a $200 million sale figure in press coverage and prompting analyst target revisions. (Century Aluminum 2025 Q4 earnings call; multiple news reports, Feb–Mar 2026)

  • U.S. Aluminum Company
    Century and partners (including EGA) signed an agreement with U.S. Aluminum Company to explore a fabrication plant near the planned Inola, Oklahoma smelter—an arrangement that signals downstream integration opportunities tied to new primary capacity. (News coverage, FY2026)

What the company-level constraints tell investors

Century’s documented constraints describe the operating model and commercial posture investors must price into the equity:

  • Contracting posture: short-term contracts dominate. Century explicitly expects its 2025 customer base to remain concentrated among a small number of customers under short-term contracts, which reduces revenue visibility and increases exposure to near-term LME moves. (Company filing signal)

  • Geographic footprint: Sales and operations are materially split by region—North America and Iceland are principal revenue regions, with the 10‑K showing United States and Iceland line items that underscore regional exposure. (Company filing signal)

  • Concentration and criticality: Glencore is a critical buyer. The 2024 Form 10‑K records that Glencore accounted for roughly 59.1% of consolidated net sales in 2024 and that sales to Glencore are governed by price formulas tied to LME and regional premiums. This is both a concentration risk and a pricing channel. (Glencore-specific constraint, Form 10‑K FY2024)

  • Relationship maturity: While Glencore sales are significant and agreements exist into 2025, most other customer contracts are short-term, which signals limited long-duration revenue guarantees outside the Glencore arrangements. (Company filing signal)

  • Product focus: Century sells core primary aluminum as a commoditized product priced to LME and regional premiums, limiting pass-through of rising production costs to customers and making margins sensitive to input cost swings. (Company filing signal)

Investment implications and a tactical checklist

Century is a leveraged play on aluminum pricing and counterparty concentration. Key investor takeaways:

  • Concentration risk is the dominant single commercial risk—stress scenarios should model alternative buyers or lower Glencore volume.
  • Price exposure is structural: short-term contracting plus LME-based pricing produces volatile operating leverage; use forward curves and premium assumptions when stress-testing EBITDA.
  • Operational dependencies matter: alumina supply (Gramercy, Jamalco) and legacy power arrangements (Big Rivers / Kenergy contingent items) can generate outsized shocks to production and costs.
  • The Hawesville sale to TeraWulf improves liquidity and reduces asset exposure, but does not eliminate upstream commercial concentration on Glencore. (See 2025 Q4 commentary and press coverage, Feb–Mar 2026.)

For a detailed counterparty exposure report and scenario analysis tools, visit https://nullexposure.com/.

Bottom line

Century Aluminum’s revenue is highly concentrated, LME-price exposed, and tied to operationally sensitive feedstock and power relationships. The Glencore relationship is the single most material commercial factor; short-term contracting elsewhere keeps earnings volatile and dependent on both commodity and counterparty dynamics. The Hawesville divestiture reduces some asset and operational risk and strengthens the balance sheet, but it does not alter the fundamental counterparty concentration. For investors and operators, the focus should be on monitoring Glencore volumes/pricing, alumina logistics, and any evolution from short-term toward longer, margin-stable contracts.

If you want granular counterparty analytics and concentration dashboards for CENX and peer comparisons, go to https://nullexposure.com/.