CME Reports Average Daily Volume Of 4.1 Million Contracts In November 2005, Up 27 Percent From Year-Ago Period, With Record Open Interest - CME(R) Globex(R) Volume Represents 71 Percent Of Total Exchange Volume, Up 32 Percent From November 2004

CME, the world’s largest and most diverse financial exchange, today said average daily volume in November was 4.1 million contracts, up 27 percent from the same period a year ago. Total monthly volume was more than 86 million contracts. Average daily volume on the CME Globex electronic trading platform averaged 2.9 million contracts, a 32 percent increase from November 2004. Electronic trading represented 71 percent of total CME volume in November, compared with 68 percent in the prior-year period. Electronic options trading volume at CME represented 8 percent of total options in November, compared with 3 percent in the same period a year ago.

Average daily volume of CME foreign exchange products was 369,000 contracts, a 65 percent increase compared with November 2004. November 2005 was the second consecutive record non-roll month for these products, up 12 percent compared to October 2005. During the month, trading of electronic foreign exchange products at CME increased 87 percent from the same period a year ago to 322,000 contracts per day.

CME total interest rate volume was 2.4 million contracts per day in November, up 30 percent from the same period a year ago. This increase was driven by continued growth in CME Eurodollar options, up 45 percent to 722,000 contracts per day in November from the same period a year ago. CME Eurodollar futures grew 24 percent to 1.7 million contracts per day. Electronic CME Eurodollar futures averaged 1.3 million contracts per day in November, up 37 percent from the same period a year ago.

Trading in CME E-mini^® equity index products averaged 1.2 million contracts per day in November, an increase of 17 percent compared with the same period last year. The company posted records of 1,200 CME E-mini NASDAQ-100^® options contracts per day and 1,500 CME E-mini Russell 2000^® options contracts per day, up from 200 and 800 contracts per day, respectively, in the third quarter.

CME also achieved record agricultural commodity trading volume of 59,000 contracts per day in November, up 11 percent from the same period a year ago.

Open interest for all CME products at the end of November was a record 36 million contracts, with an additional 39 million Total Return Asset Contracts^® (Trakrs). Also, the Chicago Board of Trade (CBOT) had approximately 11 million open positions at CME Clearing at the end of November. Open interest represents the number of contract positions that are not closed out at the end of a trading session.

All statistics in this news release exclude data on CME’s non-traditional TRAKRS^®products and CME Economic Derivatives unless otherwise noted.

CME MONTHLY AVERAGE DAILY VOLUME (In Thousands)

*Includes launch of Rogers International Commodity Index TRAKRS on Nov. 3, 2005, which traded more than 28 million contracts on that day.

CME RATE PER CONTRACT AND ADV THROUGH OCTOBER 2005 (excluding TRAKRS)

Average Daily Volume (In Thousands)
Rolling 3 Month Average

Monthly Volume Reports

Chicago Mercantile Exchange Inc. (www.cme.com) is 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 floors. CME offers futures and options on futures primarily in four product areas: interest rates, stock indexes, foreign exchange and commodities. The exchange moved about $1.4 billion per day in settlement payments in the first three quarters of 2005 and managed $43.8 billion in collateral deposits at September 30, 2005, including $3.8 billion in deposits for non-CME products. CME is a wholly owned subsidiary of Chicago Mercantile Exchange Holdings Inc. (NYSE, NASDAQ: 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 quarterly report on Form 10-Q, 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.

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