CHICAGO, April 26 /PRNewswire-FirstCall/ -- Chicago Mercantile Exchange Holdings Inc. (NYSE:CMENASDAQ:CME) yesterday declared a second-quarter dividend of 86 cents per share, payable June 25, 2007, to shareholders of record as of June 8, 2007. Chicago Mercantile Exchange Holdings Inc. became the first publicly traded U.S. financial exchange on Dec. 6, 2002. The company was added to the S&P 500(R) Index on August 10, 2006, and the Russell 1000(R) Index on July 1, 2003. It is the parent company of Chicago Mercantile Exchange Inc. ( http://www.cme.com/ ), the largest and most diverse financial exchange in the world. As an international marketplace, CME brings together buyers and sellers on its CME Globex electronic trading platform and on its trading floors. CME offers futures and options on futures primarily in interest rates, equities, foreign exchange and commodities. The Globe Logo, Chicago Mercantile Exchange(R), CME(R), E-mini(R), Globex(R), Swapstream(R) and CME Auction Markets(TM) are trademarks of CME. Other trade names, service marks, trademarks and registered trademarks that are not proprietary to Chicago Mercantile Exchange Inc. are the property of their respective owners, and are used herein under license. Further information about CME and its products is available on the CME Web site at http://www.cme.com/ . CME-G DATASOURCE: Chicago Mercantile Exchange Holdings Inc. CONTACT: Media Contacts, Anita Liskey, +1-312-466-4613, or William Parke, +1-312-930-3467, , or Investor Contact, John Peschier, +1-312-930-8491, all of Chicago Mercantile Exchange Holdings Inc. Web site: http://www.cme.com/

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