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Chicago Mercantile Exchange Holdings Inc. Completes Secondary Offering

Date 19/11/2003

Chicago Mercantile Exchange Holdings Inc. (NYSE: CME) today announced the successful completion of the offering of 2,366,069 shares of Class A common stock by certain of its shareholders, including the over-allotment option. The company did not sell any shares or receive any proceeds from the sale of stock by its shareholders in the offering. The offering was priced on Nov. 13 at $67.00 per share and closed on Wednesday, Nov. 19.

Immediately following the offering, there were 32,898,561 shares of CME's Class A Common Stock outstanding, of which 9,050,434 were available for trading on the New York Stock Exchange.

The offering was conducted in accordance with the company's charter in connection with the termination of the transfer restrictions on the company's Class A-2 common stock. Morgan Stanley was the book-running manager for the offering with Goldman, Sachs & Co. and UBS Securities LLC as senior co-managing underwriters. Citigroup, J.P. Morgan Securities and William Blair & Company were co-managing underwriters.

This news release 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. Chicago Mercantile Exchange Holdings Inc. became the first publicly traded U.S. financial exchange on Dec. 6, 2002. The company was added to the Russell 1000® Index on July 1, 2003. It is the parent company of Chicago Mercantile Exchange Inc., the largest futures exchange in the United States. As an international marketplace, CME brings together buyers and sellers on its trading floors and its GLOBEX electronic trading platform. CME offers futures contracts and options on futures contracts primarily in four areas: interest rates, stock indexes, foreign exchange and commodities. The exchange moved about $1.5 billion per day in settlement payments in the first nine months of 2003 and managed $29.6 billion in collateral deposits at Sept. 30, 2003. Chicago Mercantile Exchange, CME and GLOBEX are registered trademarks of Chicago Mercantile Exchange Inc.