News Release

CME and the Korean Ministry of Finance and Economy Collaborate to Launch New Korean Won Futures

Thu May 18 2006

SEOUL, Korea and CHICAGO, May 18 /PRNewswire-FirstCall/ -- In cooperation with the Korean Ministry of Finance and Economy (MOFE), CME, the world's largest and most diverse financial exchange and the largest regulated marketplace for foreign exchange (FX) trading, today announced its plan to list futures and options on futures on the Korean Won. The contracts are scheduled to launch later this year and will trade exclusively on the CME Globex® electronic trading platform.

"We are extremely pleased to receive the support of the Korean Ministry of Finance and Economy for CME Won futures," said CME Chairman Terry Duffy. "The Republic of Korea represents one of the world's most important economies and CME Korean Won futures will provide global financial institutions, corporations and investors with a valuable tool to hedge fluctuations in the valuation of the Korean Won as they seek to manage the inherent risks in international currency markets."

"It is expected that listing of Korean Won futures contracts in CME will facilitate the Won's internationalization," said Tae-Kyun Kwon, Director- General of International Finance Bureau, MOFE. "We expect that boosted risk management on the Won through CME would encourage foreign investments in the Won-based financial products."

"The introduction of CME Korean Won futures and options contracts represents an important facet of our comprehensive and long-term Asian growth strategy," said Craig Donohue, CME Chief Executive Officer. "During the past two years, CME has launched a number of initiatives targeted to Asian-based investors, including our historic agreement with the China Foreign Exchange Trading System to provide Chinese banks with access to CME's foreign exchange and interest rate products, new products such as our CME E-mini® S&P Asia 50® and CME E-mini MSCI EAFE® futures contracts, the opening of our first Asian telecommunications hub in Singapore, the introduction of our Asia and Emerging Markets Incentive Plans, and the extension of the CME FX on Reuters service to Hong Kong."

CME offers the world's largest regulated FX trading complex, providing users with liquid, transparent markets, guaranteed execution and central counterparty clearing risk management on 37 individual FX futures and 24 options on futures products. CME received FX Week's 2005 eFX award for the best electronic futures platform. Last year, over 51 million FX contracts with a notional value of over $6.2 trillion traded at CME.

The Ministry of Finance and Economy (MOFE) of Republic of Korea is responsible for wide range of economic and financial policies towards the nation's medium and long term economic and social developments.

Chicago Mercantile Exchange Inc. ( http://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: CME)(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 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 and CME Globex are registered trademarks of Chicago Mercantile Exchange Inc. E-mini is a trademark of CME. 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 Inc.

CONTACT: Media Contacts, Anita Liskey, +1-312-466-4613, or Pamela Plehn,
+1-312-930-3446, or news@cme.com , or Investor Contact, John Peschier,
+1-312-930-8491, all of CME; or Kyungjin Song, +1-822-2110. 2348, or Kun-Il
Hwang, +1-822-2110. 2493, or fppr@mofe.go.kr , or english.mofe.go.kr , both
for Korean MOFE

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