News Release

CME Executive Chairman and Chief Executive Officer to Present at William Blair Conference June 20

Tue Jun 19 2007

CHICAGO, June 19 /PRNewswire-FirstCall/ -- Chicago Mercantile Exchange Holdings Inc. (NYSE: CME)(NASDAQ: CME) announced today that Executive Chairman Terry Duffy and Chief Executive Officer Craig Donohue will present at the William Blair & Company 27th Annual Growth Stock Conference, to be held at the Four Seasons Hotel in Chicago, on June 20 at 1:00 p.m. (Central Time).

The presentation will be broadcast live over the Internet and can be accessed via the exchange's web site at http://investor.cme.com/. Please allow extra time prior to the presentation to visit the site and download the streaming media software required to listen to the Internet broadcast. Accompanying slides will also be available at the same location. An audio Webcast will be available for replay at the same address approximately 24 hours following the conclusion of the conference.

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® Index on August 10, 2006, and the Russell 1000® 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®, CME®, E-mini®, Globex®, Swapstream® and CME Auction Markets™ 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

SOURCE: Chicago Mercantile Exchange Holdings Inc.

CONTACT: media, Anita Liskey, +1-312-466-4613, news@cme.com, or William
Parke, +1-312-930-3467, news@cme.com, or investors, John Peschier,
+1-312-930-8491, all of Chicago Mercantile Exchange Holdings Inc.

Web site: http://www.cme.com/

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