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Chicago Mercantile Exchange Holdings Shareholders To Sell Approximately 1.4 Million Class A Shares In Secondary Offering

Date 09/06/2003

Chicago Mercantile Exchange Holdings Inc. (NYSE: CME) announced today that it filed a registration statement with the Securities and Exchange Commission with further details about its secondary offering of Class A common stock. Shareholders of CME Holdings are offering 1,403,728 shares in the offering, including an over-allotment option being granted to the underwriters by the selling shareholders. The company will not sell any shares or receive any proceeds from the sale of stock by its shareholders.

The offering is being conducted in accordance with the company's charter in connection with the termination of the transfer restrictions on the company's Class A-1 common stock. Morgan Stanley is acting as the book-running manager for the offering with UBS Securities LLC as joint-lead manager. Citigroup, J.P. Morgan Securities and William Blair & Company are acting as co-managing underwriters.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This announcement shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

When available, copies of the preliminary prospectus may be obtained from Morgan Stanley & Co. Incorporated, 1585 Broadway, New York, N.Y. 10036.

Chicago Mercantile Exchange Holdings Inc. is the parent company of Chicago Mercantile Exchange Inc. (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.