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Highlights

  • U.S. tariffs doubled to 50%, pushing the Midwest physical premium to ~60¢/lb (~$1,323/t).
  • LME warehouse concentration and Russian metal restrictions tightened deliverable supply.
  • China’s 45 Mt output cap limited primary growth, reinforcing global scarcity signals.

Aluminium prices spent much of 2025 climbing amid a structural supply squeeze amplified by policy shocks, inventory concentration, and constrained production. Early in the year, LME three-month futures hovered around $2,700/t, with intermittent tightness reflecting short-term stress. Meanwhile, physical premiums, particularly in the U.S. Midwest, surged as import tariffs doubled to 50% in June, driving the premium to record levels near 60¢/lb (~$1,323/t). YTD, the premium had already risen over 160% as markets priced in tariff impacts and re-routed metal flows.

Supply-side dynamics were pivotal. U.S. and U.K. sanctions on Russian aluminium, combined with LME restrictions on warranting post-April 2024 metal, reduced the pool of deliverable tonnes. One party controlled up to 90% of available LME inventory in early 2025, intensifying prompt spreads and further tightening physical availability. Time-spread swings and episodes of backwardation illustrated how concentrated inventories can amplify scarcity signals even when three-month futures appear range-bound.

China, responsible for roughly 60% of global aluminium output, remained near its 45 Mt production ceiling throughout 2025, limiting the ability to offset global supply gaps. Hydropower volatility in Yunnan introduced additional operational risk, while imports of unwrought aluminium jumped 38% YoY in July, signaling strong domestic demand.

Europe faced ongoing smelter pressure from high energy costs, curtailments, and policy uncertainty, keeping primary output fragile. The combination of tariff-induced U.S. shortages, concentrated LME stock, and limited Chinese slack created a global environment where physical premiums and spreads communicated scarcity more clearly than outright futures prices.

Scrap and alumina dynamics added further nuance. Alumina prices spiked early in the year before moderating, highlighting upstream fragility, while European scrap policy debates emphasized domestic retention and low-carbon targets, supporting regional premiums.

Looking ahead, prices and premiums remain sensitive to policy shifts, warehouse concentration, and China’s output cap. U.S. tariff rollbacks, EU sanction delays, or changes in scrap flows could ease pressure, but until then, elevated all-in costs and volatile time-spreads are likely to persist. Demand growth from lightweighting, renewables, and packaging provides a steady floor, reinforcing that 2025’s aluminium environment is driven as much by deliverability as by outright consumption.