News Release

CBOT Exchange-Wide Open Interest Tops 15.6 Million Contracts

Tue Apr 18 2006

For Immediate Release
Contact:
Craig Grabiner 
(312) 341-5758 
news@cbot.com

CBOT EXCHANGE-WIDE OPEN INTEREST TOPS 15.6 MILLION CONTRACTS, SETTING A RECORD FOR THIRD CONSECUTIVE TRADING SESSION

Precious Metals complex sets fifth open interest record in April

CHICAGO, IL, April 18, 2006 – The Chicago Board of Trade (CBOT®) announced today that on Monday, April 17, Exchange-wide open interest reached record levels for the third consecutive trading session, climbing to 15,636,208 contracts.  The prior record of 15,508,436 contracts was reached on Thursday, April 13.  Open interest represents the number of trading positions that have not yet been offset and closed at the end of a trading day.

Additionally, the CBOT Metals complex rose to a new open interest record for the fifth time during the month of April, climbing to 34,167 contracts.  Within the product group, Full-

(5,000 oz.) and mini-sized (1,000 oz.) Silver futures, as well as Full-sized (100 oz.) Gold options, reached new open interest highs.  Month-to-date, the CBOT Precious Metals complex accounts for 25 percent of listed metals futures traded in North America.

During yesterday’s session, CBOT 10-Year Treasury Note futures, 30-Day Federal Fund options and the $25 Big DowSM contract also reached new open interest records.

For more information on CBOT products, please visit the Exchange’s website at www.cbot.com.

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 158-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 website at www.cbot.com.

Forward Looking Statements

In this release, our use of the words “may,” “should,” “could,” “expects,” “plans,” “anticipates,” “believes,” “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, Securities and Exchange Commission, which can be obtained at its website at www.sec.gov. We undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

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