Base Metals & Bulks
The LME complex plus iron ore: the metals that build, wire, and galvanize the world.
How Base Metals Trade
The LME: a Victorian machine that still sets world prices
The London Metal Exchange was founded in 1877, and its origin story is literal: metal merchants at the Jerusalem Coffee House drew a circle in the sawdust on the floor and shouted prices across it. That circle survives as the Ring, the last open-outcry trading floor in Europe, where a handful of Category 1 member firms still set official lunchtime prices in five-minute bursts of face-to-face dealing. Everything else about the LME is equally unusual. Unlike energy or agricultural futures exchanges, which list one contract per calendar month, the LME lists a separate prompt date for every business day out to three months, then weekly prompts, then monthly third-Wednesday prompts stretching years ahead. The benchmark is not a front-month future but the rolling 3-month forward: a new contract every day, dated exactly three months out, which is where the bulk of screen liquidity sits.
The plumbing underneath is physical. An LME futures position held to its prompt date settles by delivery of a warrant: a document of title to a specific 25-tonne parcel of metal sitting in a named LME-licensed warehouse somewhere in the network, which spans ports from Rotterdam and Busan to New Orleans and Kaohsiung. Because cash (two-day) and 3-month prices both trade continuously, the spread between them, known as the cash-to-3s, is the market's tightness gauge. When nearby metal is scarce, cash trades above 3-month and the curve is backwardated; holders of metal get paid to lend it to the market. When metal is abundant, the curve sits in contango, and the carry (contango minus financing and rent) funds the warehouse financing trades that can lock millions of tonnes away for years.
The warehouse queue scandal
The 2010s exposed how that plumbing could be gamed. After 2009, banks and trading houses bought the warehouse operators themselves: Goldman Sachs bought Metro International in Detroit, Glencore bought Pacorini in Vlissingen. Millions of tonnes of financed aluminium piled up, and because LME rules then required warehouses to load out only a small daily minimum, the queue to get metal out of Detroit stretched past 600 days at its worst. Owners of warrants kept paying rent for every day in the queue, physical premiums (the surcharge for actual deliverable metal over the LME price) blew out to records, and consumers revolted. MillerCoors told a US Senate hearing in July 2013 that the queues were costing aluminium users billions of dollars a year.
The LME responded between 2013 and 2016 with linked load-in load-out rules, queue-based rent caps, and load-out rate increases that eventually killed the long-queue business model. The episode permanently changed how the market reads LME inventory data: headline stock figures are now understood to be a residue of financing economics and warehouse incentives, not a clean measure of world surplus or deficit, and large single-day inflows or cancellations are routinely the footprint of one trading house repositioning rather than a demand signal.
March 2022: the nickel crisis that nearly killed the exchange
On March 7, 2022, in the second week of Russia's invasion of Ukraine, LME nickel rose 66 percent in a day to close above $50,000 a tonne. The next morning it doubled again, trading through $100,000 before 6 am London time. On the other side of the move sat Tsingshan Holding Group, the world's largest stainless steel producer, whose founder Xiang Guangda had built a short position of well over 150,000 tonnes across the LME and over-the-counter bank positions, much of it invisible to the exchange. Facing margin calls its members could not meet, the LME suspended nickel trading at 8:15 am on March 8 and then did something no major exchange had done in decades: it cancelled every trade executed that morning, thousands of transactions worth roughly $12 billion, resetting the market to the prior day's close.
Funds that had been profitably long, led by Elliott Management and Jane Street, sued for more than $470 million combined. The English High Court dismissed the claims in November 2023 and the Court of Appeal upheld that ruling in 2024, but the regulatory verdict was harsher: in March 2025 the Financial Conduct Authority fined the LME 9.2 million pounds, the first time the UK regulator had ever fined an exchange. The aftermath rebuilt the market's architecture. The LME imposed daily price limits of 15 percent across all metals, forced weekly reporting of OTC positions so a hidden Tsingshan cannot happen again, suspended and later restored Asian-hours nickel trading, and accelerated the shift of price discovery onto its electronic platform, leaving the Ring a ceremonial remnant. Nickel volumes took two years to recover.
COMEX, SHFE, and the 2025 copper arbitrage blowout
The LME no longer trades alone. CME Group's COMEX copper contract (25,000 pounds, cents per pound, physically delivered into US warehouses) is the US leg of the market, and Shanghai Futures Exchange copper, aluminium, zinc, nickel, lead, and tin contracts mean the marginal price in Asian hours is frequently set in China. Hong Kong Exchanges and Clearing bought the LME itself for $2.2 billion in 2012, a bet on exactly that eastward shift. Normally the three venues are pinned together by physical arbitrage within a few dollars per tonne of freight and financing costs.
In 2024 and 2025 that arbitrage broke twice, spectacularly. In May 2024 a crowded short position in COMEX copper was squeezed against thin US inventories, pushing the COMEX price more than $1,000 a tonne over the LME and sending traders scrambling to book metal onto ships. Then in February 2025 the Trump administration ordered a Section 232 national security investigation into copper imports, and the market began pricing a tariff into every COMEX contract. By July 2025, after a 50 percent tariff was announced, COMEX traded at a premium of roughly 28 percent over the LME and hundreds of thousands of tonnes of cathode were redirected into US warehouses to capture it. On July 30, 2025 the final proclamation exempted refined cathode, applying the tariff only to semi-finished products, and the COMEX price fell by roughly a fifth in a single session, the largest one-day drop in the contract's history, while the premium over the LME all but vanished. The episode is now the standard case study in policy basis risk: two contracts on the same metal are only the same trade until a government decides otherwise.
Iron ore: the giant that left the benchmark behind
Iron ore is not an LME metal and dwarfs the entire LME complex by tonnage: roughly 1.6 billion tonnes move by sea every year, more than ten times the combined weight of the six exchange-traded base metals. For four decades it priced through annual closed-door negotiations between the big three miners (Vale, Rio Tinto, BHP) and the steel mills of Japan and later China, with the first settlement of each year setting the benchmark for everyone. That system collapsed in 2010 when spot prices ran far above stale annual contracts and the miners walked away, moving first to quarterly and then effectively to spot pricing against published indices, above all the Platts IODEX assessment of 62 percent iron content fines delivered CFR China.
A derivatives complex grew on top almost instantly. SGX in Singapore launched cleared iron ore swaps in April 2009 and remains the venue where international miners, mills, and funds hedge; the Dalian Commodity Exchange launched yuan-denominated futures in 2013 that trade enormous volumes driven by Chinese speculative flow. Paper iron ore now turns over multiples of the physical seaborne market each year, a complete inversion of the pre-2010 world in which the price was set once a year over dinner.
Fact Sheets
The metal of electrification: every grid upgrade, EV, and data center is a copper order.
Congealed electricity: every tonne of aluminium is roughly 14 megawatt hours of power in solid form.
The metal that broke its own exchange in 2022, then drowned in Indonesian supply.
The rust-proofing metal whose price is really a story about smelter economics.
The quietest LME metal: a closed battery loop where roughly four of every five tonnes are recycled.
The smallest LME market, soldered into every circuit board on earth.
The biggest dry bulk trade on earth, priced one shipload at a time since the 2010 benchmark collapse.