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CME Group Inc. Announces Record Date For Vote On NYMEX Acquisition

Date 14/07/2008

CME Group Inc. (NASDAQ: CME) announced today that it has established July 18, 2008 as the record date for shareholders to vote on its proposed acquisition of NYMEX Holdings, Inc. (NYSE: NMX) at the special meeting to be held by CME Group for that purpose.

Only holders of record of CME Group Class A and Class B common stock as of the close of business on July 18, 2008, will be entitled to notice of, and to vote at the special meeting or any adjournments or postponements of the special meeting related to the transaction. The date for the special meeting has not yet been set.

CME Group and NYMEX currently expect to distribute proxy materials to shareholders and members as soon as practicable following the July 18, 2008, record date.