Aluminum Hedges and Basis Risk: The Hedge Did Not Cover What Happened
Quote from chief_editor on May 24, 2026, 3:30 pmPhysical aluminum traders hedge with LME futures. The basis risk — the spread between physical and LME — can be larger than the hedge was designed to absorb.
$1,200 per tonne. That is a rough upper bound for the aluminum Midwest premium above LME that U.S. physical aluminum buyers experienced during the 2022 supply tightness period. For a trader who had hedged their price exposure by selling LME aluminum futures, this premium movement was entirely outside the hedge. The hedge covered LME price movement. The Midwest premium, driven by regional supply-demand dynamics and logistical constraints, moved independently of the LME price and was not captured by the futures position.
A trader who had purchased 1,000 tonnes of aluminum for U.S. delivery, hedged with LME futures, and budgeted for a Midwest premium of $300 per tonne found a $900-per-tonne gap between their hedged position and the actual cost. On 1,000 tonnes, that is a $900,000 unhedged exposure that was invisible from the LME position.
LME Covers LME. Physical Markets Have Their Own Dynamics.
The LME aluminum contract is priced for metal of specific grade delivered at LME-approved warehouses at approved locations globally. Physical aluminum traded for specific delivery locations, specific alloy specifications, or specific delivery timing frequently trades at a premium or discount to the LME price that reflects local supply-demand conditions, logistics costs, and market structure.
These location and specification premia — the Midwest premium for U.S. delivery, the Rotterdam premium for European spot, the Tokyo premium for Japanese imports — are published and tradeable, but they are not perfectly correlated with LME price movements. During periods of regional supply tightness, these premia can move dramatically in ways that a pure LME hedge does not capture.
The basis risk — the risk that the physical premium moves against the hedger's position — is the residual exposure that remains after the LME hedge is in place. For a trader who is long physical aluminum and short LME futures, the P&L is: physical price change minus LME futures price change minus change in basis. If the basis widens in the wrong direction, the hedge underperforms regardless of whether the LME price moved favorably.
Industry estimates suggest that during periods of significant supply disruption — which in the aluminum market have been driven by power cost increases, sanctions on Russian producers, and logistical bottlenecks — Midwest and regional premiums have moved by $300 to $800 per tonne within single calendar years, representing basis risk of that magnitude per tonne for unhedged physical exposure.
Timing Mismatches Add to Basis Complexity
Beyond location and specification basis, physical commodity hedges face timing basis risk. The LME contract is a prompt delivery contract — the cash price settles on the next business day, and the three-month contract settles three months forward. Physical commodity sales often involve specific delivery windows that do not align neatly with LME prompt dates.
A trader who buys physical aluminum for delivery in six weeks and sells LME futures for the three-month date is carrying timing basis risk — if the LME forward curve shape changes (the spread between spot and three-month prices), the hedge will not perfectly offset the physical price risk even if the overall LME price level remains constant.
In a commodity like aluminum, where the forward curve can shift between contango and backwardation based on warehouse inventory levels and financing conditions, this timing basis risk is a real source of hedging slippage. Traders who model their hedges as directional price hedges only — without accounting for basis and timing — discover the model's limitations when a premium move or curve shape change produces a loss that the hedge was supposed to prevent.
Physical aluminum traders hedge with LME futures. The basis risk — the spread between physical and LME — can be larger than the hedge was designed to absorb.
$1,200 per tonne. That is a rough upper bound for the aluminum Midwest premium above LME that U.S. physical aluminum buyers experienced during the 2022 supply tightness period. For a trader who had hedged their price exposure by selling LME aluminum futures, this premium movement was entirely outside the hedge. The hedge covered LME price movement. The Midwest premium, driven by regional supply-demand dynamics and logistical constraints, moved independently of the LME price and was not captured by the futures position.
A trader who had purchased 1,000 tonnes of aluminum for U.S. delivery, hedged with LME futures, and budgeted for a Midwest premium of $300 per tonne found a $900-per-tonne gap between their hedged position and the actual cost. On 1,000 tonnes, that is a $900,000 unhedged exposure that was invisible from the LME position.
LME Covers LME. Physical Markets Have Their Own Dynamics.
The LME aluminum contract is priced for metal of specific grade delivered at LME-approved warehouses at approved locations globally. Physical aluminum traded for specific delivery locations, specific alloy specifications, or specific delivery timing frequently trades at a premium or discount to the LME price that reflects local supply-demand conditions, logistics costs, and market structure.
These location and specification premia — the Midwest premium for U.S. delivery, the Rotterdam premium for European spot, the Tokyo premium for Japanese imports — are published and tradeable, but they are not perfectly correlated with LME price movements. During periods of regional supply tightness, these premia can move dramatically in ways that a pure LME hedge does not capture.
The basis risk — the risk that the physical premium moves against the hedger's position — is the residual exposure that remains after the LME hedge is in place. For a trader who is long physical aluminum and short LME futures, the P&L is: physical price change minus LME futures price change minus change in basis. If the basis widens in the wrong direction, the hedge underperforms regardless of whether the LME price moved favorably.
Industry estimates suggest that during periods of significant supply disruption — which in the aluminum market have been driven by power cost increases, sanctions on Russian producers, and logistical bottlenecks — Midwest and regional premiums have moved by $300 to $800 per tonne within single calendar years, representing basis risk of that magnitude per tonne for unhedged physical exposure.
Timing Mismatches Add to Basis Complexity
Beyond location and specification basis, physical commodity hedges face timing basis risk. The LME contract is a prompt delivery contract — the cash price settles on the next business day, and the three-month contract settles three months forward. Physical commodity sales often involve specific delivery windows that do not align neatly with LME prompt dates.
A trader who buys physical aluminum for delivery in six weeks and sells LME futures for the three-month date is carrying timing basis risk — if the LME forward curve shape changes (the spread between spot and three-month prices), the hedge will not perfectly offset the physical price risk even if the overall LME price level remains constant.
In a commodity like aluminum, where the forward curve can shift between contango and backwardation based on warehouse inventory levels and financing conditions, this timing basis risk is a real source of hedging slippage. Traders who model their hedges as directional price hedges only — without accounting for basis and timing — discover the model's limitations when a premium move or curve shape change produces a loss that the hedge was supposed to prevent.