LME Copper vs. COMEX Copper

What is LME copper?

LME copper refers to copper traded in London on the London Metal Exchange, on which options and futures contracts for industrial metals are traded. The term LME copper may refer to spot LME copper prices or prices for futures contracts on the London exchange.

LME copper futures contracts may be set at up to three months with daily expiration dates, or between three and six months with weekly expiration dates. There are also longer contracts of up to 123 months.

The exchange also publishes daily reference prices for LME copper and other metals that are used by market participants. Overall, the exchange is predominantly used to either hedge or take on price risk.

LME copper contract prices are quoted in US dollars and are sold in lots of 25 metric tons. They can be settled via physical delivery between a network of LME-approved warehouses around the world. For this reason, LME copper may also refer to inventories of copper cathode in LME warehouses.

In addition to acting as a futures trading exchange and providing reference prices, the LME acts as a physical market of last resort for producers and consumers of a number of metals, including copper.

In other words, those in the copper industry may sell LME copper during oversupplied markets and draw on LME copper inventories in the event of a copper shortage.

Some market watchers look to rising and falling inventory levels on the LME as an indicator of global supply and demand conditions. However, it’s important to note that physical delivery is the exception, rather than the norm.

What is COMEX copper?

COMEX copper is copper traded on the CME Group's (NASDAQ:CME) Commodity Exchange, abbreviated as the COMEX. The term COMEX copper can refer to both spot copper prices on the COMEX and copper contracts traded on the exchange.

Headquartered in New York, US, with offices all over the world, the COMEX is a commodities futures and options exchange similar to the LME. Both the NYMEX and the COMEX, which merged in 1994, are owned by CME Group.

As mentioned above, copper contracts are priced per pound on the COMEX. Listed contracts are available during the current calendar month, the next 23 calendar months and any March, May, July, September or December within a 60 month period of the current month.

Contracts are also block-trade eligible if the amounts are above minimum thresholds. These types of trades are privately negotiated and executed apart from the public market. They are only open to eligible contract participants as defined by the Commodity Exchange Act.

Copper cathode must meet specific chemical and physical requirements in order to trade on the COMEX. COMEX copper futures are settled via physical delivery upon expiration, but COMEX E-Mini copper futures are cash settled.

As with the LME, many banks, trading firms and commercial hedgers use COMEX copper for risk management purposes, and CME Group prides the COMEX on being a “global benchmark for copper prices” used by respected indexes such as the Bloomberg Commodity Index.