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Andy Home: LME's position rules are a reflection of a changing metals market

London Metal Exchange (LME) has tightened the regulatory screws against holders of long positions at a time when both copper and aluminium contracts are in turmoil.

The unique date structure of the LME exchange has been under severe stress as traders have increased their bets despite the inventory in LME's warehouses being depleted.

It's not a coincidence that these two contracts have been the most affected. Tariffs and sanctions have caused massive distortions in the physical markets for copper and aluminum.

The LME, having just recovered from the 2022 nickel crisis, is keen to avoid another one. Since it cannot do much about tariffs or sanctions either, managing the effects is the best option.

As with any 148-year-old market, there is always the danger that tinkering with such a complex eco system can have unintended consequences.

CORNERING the Future

The copper market's turmoil this week is a classic example of a massive clash of positions ahead of the cash date.

On Monday, the "tom-next spread", which is a position roll for overnight, blew out to $69 per metric tonne. This helped to inflate backwardation over the cash-to-3-months period The price of a ton has increased to $397, the highest since 2021.

The week began with one entity having a cash position of 80-90% or more of the available stocks.

They are designed to stop anyone from cornering the market and distorting prices with a position so dominant.

The LME Special Committee introduced new rules on Friday that extend the lending cap beyond the cash date to the next monthly prompt. These are temporary, at least for the moment.

The recent pressure on the aluminium markets was not focused on the LME rolling cash date, but rather on the monthly prompt date for June.

It's clear that this is not the only position with a mega-long term contract which has caused concern to LME senior management.

The LME stated that there have been "a few occasions" where significant positions were held in the near-by prompt dates, and the special committee "at times" has directed holders to reduce their holdings "relatively to the prevailing stock level," it said.

The rub. Copper and aluminium are in short supply.

TARIFF DISTORTION

Since the beginning of 2025, LME copper stock has shrunk 65% to 94 675 tons. The amount of tonnage available is at a 2-year low of 54 525 tons.

This isn't due to a diminished global availability, but rather reflects an enormous redistribution in global inventory.

Since February, when U.S. president Donald Trump began a Section 232 investigation into U.S. imports of copper, physical metals have been flowing to the United States in order to take advantage of the premium commanded by CME's U.S. Customs-cleared Copper Contract over the LME’s international product.

The U.S. imported refined copper in April jumped above 200,000 tonnes, marking the highest arrival rate of this decade.

LME warehouses were emptied to fuel this physical tariff trading. CME stocks have nearly doubled to 184 464 tons this year, their highest level since August 2018.

SANCTIONS IMPACT

The prospect of U.S. Tariffs has disrupted global copper flows. However, sanctions against Russian metal have disrupted those for aluminium.

The LME stopped all deliveries of Russian aluminum produced after April 2024 when the United States and Britain announced sanctions against Rusal, a Russian aluminium producer.

The Russian metal that was already part of the LME could be traded, but it wasn't as popular as other brands. Since then, there have been several dogfights over the available non-Russian stock. Each involved large positions and spread volatility.

The LME's aluminium stock is now at its lowest level since October 2022. The majority of the physical stock that was awaiting loading has been removed, and what is left is mostly Russian metal.

No sign of a replenishment is imminent. LME off warrant stocks, which usually rise when visible inventories fall as metal is redirected to cheaper warehouse agreements, are also lower than at the beginning of the year.

Since March, there haven't been any significant new deliveries to the LME warrant. Since last year, the Russian liquidity has dried up and other brands may be reluctant to give them up in LME clearing.

The LME's global supply function is dependent on a fluid, globally distributed physical supply chain. This simply does not exist at this time.

Reduced Incentives

LME's lending guidelines has always been criticized for favoring holders of short positions over those with longs.

The regulatory focus is further distorted by extending the lending restrictions to dominant long positions in the first month of the curve.

Remember that the 2022 Nickel Blow-out was caused by a dominant short, not a dominating long.

The LME has stepped up its efforts to avoid another crisis, given the mismatch that is growing between the size of the position and the available inventory.

It is possible that smoothing out the distortions the LME perceives in its price-setting function could reduce the financial incentives for metals to be delivered to the supposed market of last recourse.

It's important to note that the United States is not receiving any Russian aluminum or copper.

The author is a columnist at

(source: Reuters)