News Release

Chicago Mercantile Exchange Holdings Inc. S-4 Filing Declared Effective by SEC for Vote on Proposed Merger with CBOT Holdings, Inc.

Mon Feb 26 2007

CHICAGO, Feb. 26 /PRNewswire-FirstCall/ -- Chicago Mercantile Exchange Holdings Inc. (NYSE: CME)(NASDAQ: CME) today announced that the U.S. Securities and Exchange Commission has declared effective its Registration Statement on Form S-4 relating to the proposed merger of Chicago Mercantile Exchange Holdings Inc. (CME) and CBOT Holdings, Inc. Accordingly, Chicago Mercantile Exchange Holdings will begin mailing a definitive joint proxy statement to shareholders of record as of the close of business on February 9, 2007.

Chicago Mercantile Exchange Holdings will hold a special shareholder meeting on April 4, 2007, at the W Chicago City Center hotel to seek approval for the proposed merger and other merger related issues.

Completion of the merger requires an affirmative vote of a majority of the outstanding shares of CME's Class A and Class B common stock, and a majority of the outstanding shares of CBOT's Class A common stock. The merger also requires certain approvals from certain members of the CBOT.

CME's Board of Directors has unanimously recommended that its shareholders vote "for" the approval and adoption of the merger agreement. Pending certain regulatory approvals, the parties expect to close the transaction in mid-year 2007. The joint proxy statement/prospectus is available at: http://www.sec.gov/ , http://www.cme.com/ and http://www.cbot.com/ .

Chicago Mercantile Exchange Holdings Inc. (NYSE: CME)(NASDAQ: CME) 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, and to the S&P 500® Index on Aug. 10, 2006. It is the parent company of Chicago Mercantile Exchange Inc. ( http://www.cme.com/ ), the world's largest and most diverse financial exchange. As an international marketplace, CME brings together buyers and sellers on the CME Globex® electronic trading platform and on its trading floors. CME offers futures and options on futures in these product areas: interest rates, stock indexes, foreign exchange, agricultural commodities, energy, and alternative investment products such as weather, real estate and economic derivatives. CME is a wholly owned subsidiary of Chicago Mercantile Exchange Holdings Inc. (NYSE: CME)(NASDAQ: CME).

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, our most recent Quarterly Report on Form 10-Q, which can be obtained at its Web site at http://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, CME Globex and E-mini are trademarks of Chicago Mercantile Exchange Inc. 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. Further information about CME and its products is available on the CME Web site at http://www.cme.com/ .

CME - G

SOURCE: Chicago Mercantile Exchange Holdings Inc.

CONTACT: Media Contacts, Anita Liskey, +1-312-466-4613, or Allan
Schoenberg, +1-312-930-8189, or news@cme.com , or Investor Contact, John
Peschier, +1-312-930-8491, all of Chicago Mercantile Exchange Holdings Inc.

Web site: http://www.cme.com/

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