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CME Appoints Richard H. Lamm As Managing Director, Regulatory Counsel

Date 31/05/2006

CME, the world’s largest and most diverse financial exchange, today announced the appointment of Richard H. Lamm as Managing Director, Regulatory Counsel.

Lamm, 53, will be responsible for developing and overseeing the company’s legal regulatory agenda, including coordinating the activities of the attorneys primarily responsible for regulatory activities domestically and internationally. Lamm will also oversee CME’s Market Regulation Department. He reports to Kathleen Cronin, Managing Director, General Counsel and Corporate Secretary.

“Dick’s deep knowledge of financial markets, market supervision practices and regulatory policy making, will be a tremendous asset to CME as we continue to promote our model of centralized, competitive and transparent markets,” said CME CEO Craig Donohue. “Market integrity has been a hallmark of our success and Dick’s knowledge and expertise will ensure that CME remains an industry leader in effective regulatory programs.”

“We are excited to have Dick join our team and leverage his leadership and expertise to enhance our corporate reputation,” said Kathleen Cronin, Managing Director, General Counsel and Corporate Secretary.

Lamm has over 20 years of experience in the global financial services industry. He most recently led a financial markets public policy unit of the Federal Reserve Bank of Chicago. He worked for the Federal Reserve since 1998, holding a variety of roles responsible for shaping public policy and addressing financial markets issues. He worked as an Independent Futures Trader at CME from 1994 – 1998. He also held positions of increasing responsibility in CME’s Legal Department from 1981 – 1994, including serving as Associate General Counsel. He began his career as an attorney with the firm of Schulman, Silverman & Kreiter.

Lamm earned a bachelor’s degree in political science, magna cum laude, from Union College, a J.D. from Northwestern University School of Law, and completed a post-doctoral fellowship at the Northwestern University Center for Interdisciplinary Study of Science and Technology. He has published articles and contributed to comment letters relevant to financial markets.

Chicago Mercantile Exchange Inc. (www.cme.com) is the world’s largest and most diverse financial exchange. 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 managed $47.0 billion in collateral deposits at March 31, 2006, 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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