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Chicago Mercantile Exchange Inc. Sets New Single-Day Volume Records - Chicago Mercantile Exchange Inc. Sets New Single-Day, GLOBEX® And Eurodollar On GLOBEX Trading Volume Records On Friday, May 7 - Total CME Volume Surpasses 6.5 Million Contracts

Date 10/05/2004

Chicago Mercantile Exchange Inc. Sets New Single-Day Volume Records - Chicago Mercantile Exchange Inc. Sets New Single-Day, GLOBEX® And Eurodollar On GLOBEX Trading Volume Records On Friday, May 7 - Total CME Volume Surpasses 6.5 Million ContractsChicago Mercantile Exchange Inc. (CME), the largest U.S. futures exchange, today announced that it set a new total single-day trading volume record on Friday, May 7 of 6.5 million contracts, exclusive of CME’s non-traditional TRAKRSTM contracts. Friday’s volume topped the previous single-day record of 5.5 million contracts set on March 5, 2004. Total volume on GLOBEX® reached 2.85 million contracts, surpassing the previous record of 2.6 million contracts traded on March 11, 2004. The 3.67 million contracts traded on CME’s trading floors also was an all-time record.

Interest rate products reached a record 4.6 million contracts. A record 3.2 million Eurodollar futures and 1.3 million Eurodollar options were traded. Also on Friday, more than 1.1 million Eurodollar futures contracts on GLOBEX were traded, surpassing by 39 percent the previous record of 811,443 set on April 21, 2004.

The overall volume record at CME included strength in all CME product areas, with more than 1.5 million E-mini equity index contracts, more than 250,000 foreign exchange contracts, and commodity contracts approached 50,000. Additional daily individual product records worth noting included the Mexican Peso futures on GLOBEX with more than 10,000 contracts and the E-miniTM S&P® 400 Midcap which totaled approximately 24,000 contracts.

Open interest in all CME products stood at almost 38 million contracts at the end of Friday’s trading session, and interest rate product open interest exceeded the 20 million level, with Eurodollar futures and options both at record open interest levels. Open interest represents contract positions which remain open at the end of the trading day. The CME Clearing House, the largest derivatives clearing house in the world, cleared approximately 11 million matched trades, as the Chicago Board of Trade also set a daily volume record with 4.4 million contracts traded on Friday.

Chicago Mercantile Exchange Inc. (www.cme.com) is the largest futures exchange in theUnited States. As an international marketplace, CME brings together buyers and sellers on its trading floors and GLOBEX® electronic trading platform. 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 the first quarter of 2004 and managed $38.1 billion in collateral deposits at March 31, 2004. CME is a wholly owned subsidiary of Chicago Mercantile Exchange Holdings Inc. (NYSE: CME), which is part of the Russell 1000® Index.

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 atwww.sec.gov. CME undertakes 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 GLOBEX are registered trademarks of Chicago Mercantile Exchange Inc. E-mini is a trademark of CME. S&P, S&P 500, NASDAQ-100, 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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