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CBOT $5 Mini-sized Dow Futures Open Interest Surges Past 100,000 Mark

Date 09/12/2005

The Chicago Board of Trade (CBOT®) announced today that open interest for the Exchange’s $5 mini-sized DowSM futures soared past the 100,000 mark to 101,662 contracts on December 8, 2005 and surpassed the old record of 98,734 contracts set on December 7, 2005. Open Interest in the contract grew 38.2 percent between November 2004 and November 2005.

CBOT mini-sized Dow Futures Contract Average Daily Volume through December 7, 2005

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In addition, average daily volume for the CBOT’s mini-sized Dow futures contract increased 22 percent YTD through November 2004 and surpassed the 100,000 mark three times in 2005.

CBOT Senior Vice President of Business Development Robert Ray said, “We couldn’t be more pleased with the tremendous growth our mini-sized Dow has experienced. We believe that increased awareness, driven by the CBOT’s outreach and education efforts, as well as the contract’s appeal to a broad base of market participants have contributed to the mini-sized Dow’s resounding success.”

The CBOT Dow complex, which includes full-sized ($10) and mini-sized ($5) Dow options, and full-sized ($10) and mini-sized ($5) Dow futures, is based on the Dow Jones Industrial AverageSM – one of the world's most readily recognized and followed stock indexes. It provides large and small investors a way to take a position based on the performance of the DJIASM, to diversify and protect their portfolios against potential adverse price changes in the stock market, and to preserve investment value.

About the CBOT

As one of the leading global derivative exchanges, the Chicago Board of Trade provides a diverse mix of financial, equity, and commodity futures and options-on-futures products. Building on its 157-year history, the CBOT continues to advance into the future using the strength of deep liquidity, market integrity and member-trader expertise. Using superior trading technology in both electronic and open-auction trading platforms, the CBOT provides premier customer service to risk managers and investors worldwide. For more information visit our web site at www.cbot.com.

Forward Looking Statements

In this release, our use of the words “may,” “will,” “should,” “could,” “expects,” “plans,” “anticipates,” “believes,” “estimates,”“predicts,” “potential” or “continue” or other comparable terminology is intended to identify 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 filings made by CBOT Holdings, Inc. with the Securities and Exchange Commission, which can be obtained at its website at www.sec.gov. Except for any obligation to disclose material information under Federal securities laws, we undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise

"Dow Jones," "The Dow," "Dow Jones Industrial Average," "DJIA" are service marks of Dow Jones & Company, Inc. and have been licensed for use for certain purposes by the Board of Trade of the City of Chicago, Inc. (CBOT). The CBOT futures and futures options contracts based on the Dow Jones Averages are not sponsored, endorsed, sold, or promoted by Dow Jones, and Dow Jones makes no representation regarding the advisability of trading in such contracts.