The New York Mercantile Exchange (NYMEX) is the world's largest physical commodity futures exchange, located in New York City. Its two principal divisions are the New York Mercantile Exchange and Commodity Exchange, Inc (COMEX) which were once separate but are now merged. The parent company of the New York Mercantile Exchange, Inc., NYMEX Holdings, Inc. became listed on the New York Stock Exchange on November 17, 2006, under the ticker symbol NMX. Less than two years later, on August 22, 2008, NYMEX Holdings was formally acquired by CME Group (symbol: CME) and the NMX symbol was de-listed.

The New York Mercantile Exchange handles billions of dollars worth of energy products, metals, and other commodities being bought and sold on the trading floor and the overnight electronic trading computer systems. The prices quoted for transactions on the exchange are the basis for prices that people pay for various commodities throughout the world.

The floor of the NYMEX is regulated by the Commodity Futures Trading Commission, an independent agency of the United States government. Each individual company that trades on the exchange must send its own independent brokers. Therefore, a few employees on the floor of the exchange represent a big corporation and the exchange employees only record the transactions and have nothing to do with the actual trade. The NYMEX is one of the few exchanges in the world to maintain the open outcry system, where traders employ shouting and complex hand gestures on the physical trading floor.