News Release

Chicago Mercantile Exchange to Dual List on The NASDAQ Stock Market

Wed Apr 27 2005

CHICAGO and New York - April 27, 2005 - Chicago Mercantile Exchange Holdings Inc. (NYSE: CME) today announced that it intends to dual list its common stock on The Nasdaq Stock Market, Inc. (NASDAQ: NDAQ). Chicago Mercantile Exchange Holdings, parent of CME, the largest futures exchange in the United States, will have its listing become effective on NASDAQ under the “CME” symbol within the next several weeks. CME Chairman Terry Duffy said, “CME, which was the first U.S. exchange to demutualize and become publicly-traded in 2002, has decided to dual list its stock on The Nasdaq Stock Market, one of the world’s leading marketplaces. Since completing our successful IPO, we have focused on building and diversifying our shareholder base, while ensuring the orderly development of liquidity in our stock. Today’s decision reflects our commitment to providing our shareholders with the additional benefits that listing on NASDAQ provides.” ”CME is now the largest derivatives exchange in the world, and we welcome them to our family of industry leading companies,” said Bob Greifeld, president and chief executive officer of The Nasdaq Stock Market. “Clearly CME is uniquely qualified to evaluate listing venues and we are pleased that they have chosen to dual list with NASDAQ.” CME Chief Executive Officer Craig Donohue said, “Given CME’s position as one of the world’s leading financial technology companies, we believe that listing our stock on NASDAQ - which is already home to many of the world’s most successful technology companies -- will further enhance our already strong corporate brand and raise additional investor awareness of our stock.” With approximately 3,400 companies, NASDAQ lists more companies and, on average, trades more shares per day than any other U.S. market. It is home to category-defining companies that are leaders across all areas of business including technology, retail, communications, financial services, media and biotechnology. For more information about NASDAQ, visit the NASDAQ Web site at www.NASDAQ.comor the NASDAQ NewsroomSM at www.NASDAQnews.com. 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. (www.cme.com), the largest futures exchange in the United States. As an international marketplace, CME brings together buyers and sellers on CME Globex® electronic trading platform and on its trading floor. CME offers futures 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 first-quarter 2005 and managed $44.4 billion in collateral deposits at March 31, 2005, including $4.3 billion in deposits for non-CME products. Statements in this news release that are not historical facts are forward-looking statements. These statements are not guarantees of future performance and involve risks, uncertainties and assumptions that are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed or implied in any forward-looking statements. More detailed information about factors that may affect our performance may be found in our filings with the Securities and Exchange Commission, including our most recent annual report on Form 10-K, which can be obtained at its Web site at www.sec.gov. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise. Chicago Mercantile Exchange, CME, the globe logo and CME Globex are registered trademarks of Chicago Mercantile Exchange Inc. E-mini is a trademark of CME. CLEARING 21 is a registered trademark of CME and New York Mercantile Exchange, Inc. S&P, S&P 500, NASDAQ-100, Nikkei 225, Russell 1000, Russell 2000, TRAKRS, Total Return Asset Contracts and 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.

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