News Release

NYMEX Energy Futures Successfully Launch on CME Globex® Platform

Mon Jun 12 2006

NEW YORK and CHICAGO, June 12 /PRNewswire-FirstCall/ -- NYMEX Holdings, Inc., the parent company of the preeminent physical futures exchange, and CME, the world's largest and most diverse financial exchange, today reported solid volume on the first day that NYMEX energy products traded on the CME Globex® electronic trading platform.

NYMEX energy futures reached an estimated 62,695 contracts traded today on CME Globex, with full-sized crude oil futures trading an estimated 11,000 contracts.

NYMEX standard-sized and NYMEX miNY™ futures contracts for crude oil, natural gas, heating oil and gasoline traded on CME Globex during open outcry trading hours as well as before and after the NYMEX trading floor was closed. Also available on CME Globex are NYMEX Europe Brent crude oil standard-sized and miNY futures contracts and the Northwest Europe gasoil futures.

CME is the exclusive electronic trading services provider for NYMEX's energy futures contracts. Access to electronic trading of NYMEX products is available virtually 24 hours a day on CME Globex, the world's leading derivatives electronic trading platform and the only electronic market place to offer every major asset class -- interest rate, stock index, foreign exchange, agricultural, and, now energy.

NYMEX Holdings, Inc. (NYMEX) is the parent company of the New York Mercantile Exchange, Inc., the preeminent physical futures exchange, offering futures and options trading in energy and metals contracts and clearing services for off-exchange energy transactions. Through a combination of open outcry electronic trading, a wide range of crude oil, petroleum products, natural gas, coal, electricity, gold, silver, copper, aluminum, and platinum group metals markets are available virtually 24 hours each day. More information about NYMEX is available at http://www.nymex.com/ .

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.

NYMEX Forward-Looking and Cautionary Statements

This press release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act, with respect to our future performance, operating results, strategy, and other future events. Such statements generally include words such as could, can, anticipate, believe, expect, seek, pursue, proposed, potential and similar words and terms, in connection with any discussion of future results, including our exploration of and ability to consummate, including as a result of market conditions, a potential initial public offering or other strategic alternative. Forward- looking statements involve a number of assumptions, risks, and uncertainties, any of which may cause actual results to differ materially from the anticipated, estimated, or projected results referenced in the forward-looking statements. In particular, the forward-looking statements of NYMEX Holdings, Inc., and its subsidiaries are subject to the following risks and uncertainties: our determination not, or difficulties, delays or unanticipated costs in our ability, including as a result of market conditions, to consummate a potential initial public offering or other strategic alternative; the success and timing of new futures contracts and products; changes in political, economic, or industry conditions; the unfavorable resolution of material legal proceedings; the impact and timing of technological changes and the adequacy of intellectual property protection; the impact of legislative and regulatory actions, including without limitation, actions by the Commodity Futures Trading Commission; and terrorist activities, international hostilities or natural disasters, which may affect the general economy as well as oil and other commodity markets. The Company assumes no obligation to update or supplement our forward-looking statements.

CME Forward-Looking Statements

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 Annual Report on Form 10-K, 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. S&P and S&P 500 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: Press inquires, Anu Ahluwalia for NYMEX, +1-212-299-2439; or
Press inquiries, Anita Liskey, +1-312-466-4613, or Mary Haffenberg,
+1-312-930-3435, news@cme.com , or Investor Contact, John Peschier,
+1-312-930-8491, all of Chicago Mercantile Exchange Inc.

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

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