From USD 86 to USD 350: how 6 months reshaped Japan’s aluminium premium to become Asia’s new risk benchmark

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Japan’s aluminium premium has climbed from USD 86 per tonne in Q4 2025 to an average USD 351.5 per tonne (ranging between USD 350-353 per tonne) for Q2 2026 shipments, being the steepest quarterly escalation in more than a decade and the highest level since the USD 380-per-tonne settlements recorded in 2015. The recently agreed premium has added more than USD 260 per tonne to Japanese buyers’ physical procurement costs within 6 months, pushing delivered aluminium prices above USD 3,800 per tonne.

The scale and speed of the escalation have fundamentally altered the role of the Japan Main Port (MJP) premium, long regarded as Asia’s benchmark for physical aluminium shipments. Historically, the premium largely reflected freight economics, regional demand and availability. In 2026, it has evolved into a pricing mechanism for geopolitical risk, supply-chain resilience, energy scarcity and carbon-linked procurement.

During Q4 2025 negotiations, Japanese buyers settled premiums around USD 86 per tonne despite producer offers ranging between USD 95 and USD 110 per tonne. By Q1 2026, settlements had surged to USD 195 per tonne after producers opened negotiations between USD 190 and USD 225 per tonne, representing a 127 per cent quarter-on-quarter jump.

The market tightened even further as negotiations for April-June shipments began in February. Initial producer offers ranged between USD 220 and USD 250 per tonne, already beckoning mounting concern over physical supply.

But within weeks, the market structure shifted dramatically. Rio Tinto revised its offer upward to USD 350 per tonne by mid-March, effectively resetting price expectations across Asia. Final settlements averaged USD 351.5 per tonne, with four deals concluded at USD 350 per tonne for a combined 10,000 tonnes per month and five deals settled at USD 353 per tonne covering another 5,000 tonnes monthly.

The 79 per cent jump in negotiated premiums during the final weeks of March tells the tale of how a market is reacting in real time to geopolitical disruption rather than traditional industrial demand cycles.

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