Aluminum Surges to Four-Year High as LME Stocks Drain Below 340,000 Tonnes

Aluminum prices punched through a fresh four-year ceiling this week as the LME three-month contract settled near $3,680 per tonne on May 26, with an intraday spike to $3,707.50/t. The rally brings the red metal within striking distance of the 2022 post-Ukraine invasion peak of $4,073.50/t, a threshold that now looks increasingly vulnerable as supply-side headwinds pile up and visible inventories drain at an accelerating clip. (FACT: INN, S&P Global, May 26, 2026)

The proximate driver is the relentless drawdown in LME registered stockpiles, which have fallen below 340,000 tonnes for the first time since mid-2022. Exchange inventory at these levels has historically been a reliable leading indicator of acute backwardation and further price acceleration. The current cash-to-three-month spread of approximately $60/t — cash commanding a premium above deferred contracts — confirms that physical consumers are paying up aggressively for prompt metal. (FACT: TradingEconomics, May 27, 2026; S&P Global, May 2026)

The backwardation structure has been building since April, when a cascade of supply disruptions — including the closure of South32's Mozal smelter in Mozambique and Century Aluminum's production cuts in Iceland — began to pinch ex-China availability. ING had already flagged a deepening 2026 deficit in March, but the magnitude of recent smelter outages has supercharged the market. The Gulf crisis in late March destroyed an estimated 3.0-3.2 million tonnes of annual capacity across Emirates Global Aluminium's Al Taweelah plant and Aluminium Bahrain, compounding losses that were already tightening balances. (FACT: CNBC TV18, May 2026; AL Circle, May 2026)

On the demand side, the structural drivers remain firmly in place. Electric vehicle production, solar installations, and grid infrastructure spending continue to absorb growing volumes of the metal. Global aluminum demand is expanding at roughly 2.5% annually, while ex-China supply is shrinking. The resulting imbalance is being priced into the forward curve, where the premium for spot metal over deferred delivery has widened to levels not seen since the worst of the 2022 energy crisis. (FACT: S&P Global, May 20, 2026; INN, May 26, 2026)

The next psychological barrier at $4,000/t is within reach. If LME stocks continue to decline at the current pace of roughly 10,000-15,000 tonnes per week — heading toward 300,000 tonnes — the backwardation is likely to widen further, pulling spot prices higher. The key risk to the upside is that restarts for idled smelters take 6-12 months and cost hundreds of millions of dollars, meaning supply relief is not imminent. (FACT: TradingEconomics, May 27, 2026; AL Circle, May 2026)