CME Group Definition - The CME Group is the world‘s largest futures exchange, which includes the Chicago Mercantile Exchange (CME), Chicago Board of Trade (CBOT), and New York Mercantile Exchange (NYMEX). CME Group was created July 12, 2007 from the merger between the CME and the CBOT. On March 17, 2008, it announced its acquisition of NYMEX Holdings, Inc., parent company of the New York Mercantile Exchange, which was formally completed on August 22, 2008. On February 10, 2010, CME announced its purchase to buy 90% of the Dow Jones‘s Indexes including the DJIA. CME Group owns 5 % of BM&F Bovespa, the São Paulo stock exchange and BM&F Bovespa owns 5% of CME Group.