The LME aluminum market is flashing its most potent physical-shortage signal in nearly two decades as the forward curve contorts into deep backwardation. With cash metal trading at a $59 per tonne premium over the three-month contract, the market is effectively paying holders a punishing premium to deliver metal today — a structure that historically precedes acute spot tightness and sharp price acceleration.
The backwardation is not occurring in isolation. Cancelled warrants — metal earmarked for physical withdrawal from LME warehouses — surged 13% week-on-week to 74,400 tonnes, representing roughly 22% of total LME stocks of 339,475 tonnes. Effectively, exchange-visible inventory available for immediate delivery has collapsed to approximately 265,000 tonnes, a level that barely covers two days of global consumption. The inventory drawdown reflects simultaneous offtake from traditional consumers, financial players rolling positions into higher spreads, and traders securing tonnage against potential supply disruptions from the Gulf and Southern Africa.
Compounding the physical squeeze, US Midwest premiums have soared to an historic $260–400 per tonne over LME, pushing all-in US costs above $4,000 per tonne for the first time. The 50% tariff on Canadian imports has locked the US market into a premium spiral, while EU duty-paid premiums sit at $340/t. These regional premiums amplify the backwardation's message: there is simply not enough metal available to satisfy prompt demand across both sides of the Atlantic.
For market participants, the combination of backwardation, collapsing LME stocks, and surging cancelled warrants paints an unambiguous picture of structural deficit.