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Chicago Mercantile Exchange Holdings Inc. To Present At The William Blair & Company's 23rd Annual Growth Stock Conference On June 26, 2003 - Company's Presentation To Be Broadcast Live At 8:30 A.M. (CDT) Over The Internet

Date 26/06/2003

Chicago Mercantile Exchange Holdings Inc. will present at the William Blair & Company 23rd Annual Growth Stock Conference in Chicago. Terrence A. Duffy, Chairman, James J. McNulty, President and Chief Executive Officer and David G. Gomach, Managing Director and Chief Financial Officer, will participate in CME presentations.

In conjunction with this appearance, William Blair will provide a live broadcast of the presentation on Thursday, June 26, 2003, at 8:30 a.m. CDT on the Internet. Listeners will need to register at the following Web address: http://www.twst.com/econf/mm/blair2/cme.html.

Listeners should go to this site at least 15 minutes before the event to register, and download and install any necessary software - Microsoft Windows Media Player or RealPlayer. You can also pre-register at any time prior to the Webcast. Interested parties can also access the link via the Investor Relations link on CME's Web site, http://www.cme.com/.

Chicago Mercantile Exchange Holdings Inc. is the parent company of Chicago Mercantile Exchange Inc. ( http://www.cme.com/), the largest futures exchange in the United States based on notional value, trading volume and open interest. On Dec. 6, 2002, CME became the first publicly traded U.S. financial exchange. As an international marketplace, CME brings together buyers and sellers on its trading floors and GLOBEX around-the-clock electronic trading platform. CME offers futures contracts and options on futures primarily in four product areas: interest rates, stock indexes, foreign exchange and commodities. The exchange moved about $1.5 billion per day in settlement payments in the first quarter of 2003 and managed $28.5 billion in collateral deposits at March 31, 2003.

Further information about Chicago Mercantile Exchange Holdings Inc. and Chicago Mercantile Exchange Inc. is available on the CME Web site at http://www.cme.com/.