LME Aluminum Inventory Depletion Increases Physical Spot Premium Risks
Dwindling exchange inventories will increase physical sourcing premiums despite fluctuations in base futures prices.
On Warrant Metals
Registered Inventory
Refined commodities stored in exchange-approved warehouses are backed by legal documents of title that permit their physical delivery against futures contracts. These specific holdings, referred to as on warrant metals, are available for immediate withdrawal or delivery to settle outstanding paper positions. This category of stock contrasts with cancelled warrants, which have been earmarked for physical removal from the warehouse system.
Market Liquidity
The volume of available exchange inventory plays an important role in determining the prompt premium of physical commodities. Low levels of on warrant metals signal to the market that prompt supply is tight, which can trigger backwardation and price spikes on the exchange. Conversely, a large influx of warranted stock indicates ample supply and often leads to a contango curve structure.
Warehouse Mechanics
Metal producers and traders deliver refined ingots to certified facilities to gain the liquidity and financing benefits of exchange warrants. While these on warrant metals remain in the registered warehouse system, they incur daily storage and insurance fees that are paid by the warrant holder. This continuous flow of material in and out of certified facilities ensures that exchange prices reflect actual physical supply and demand balances.
When financing rates are low, banks and trade houses may lock these warrants in long-term cash-and-carry trades, removing them from prompt market availability and further tightening the active exchange inventory.