News Release

CME Announces Certified Options Partner Program

Thu May 19 2005

Twelve Firms to Provide Front-End Solutions for Options Trading CHICAGO, May 19, 2005 - As part of its initiative for increasing the volume of electronic trading for options on foreign exchange, equity indexes and interest rates, CME, the largest futures exchange in the U.S., today announced the new CME-Certified Options Partner Program listed below. This program fosters collaboration between CME and the CME Options Program Partners so that enhanced CME Options products and functionality are available to the marketplace upon CME launch. CME also plans to integrate the CME Enhanced Options System for CME Eurodollar options into the CME® Globex® electronic trading platform, which operates virtually 24 hours every trading day, later this year. This enhanced options functionality for CME Eurodollars facilitates trading of complex combination and spread trades typically used with short-term interest rate options on futures within a fully transparent and competitive execution environment. “We work closely with key technology partners around the world to provide our global customers with access to software that supports new CME options products and functionality,” said Rick Redding, managing director, Products and Services for CME. “We developed the CME-Certified Options Partner Program to ensure that all required functionality is available for roll-out, to our mutual customers, starting in the third quarter of this year. CME has partnered with the following firms who have committed to supporting the upcoming CME electronic options enhancements: Actant* Credit Suisse First Boston Catus Technologies FFastFill GL TRADE* NYFIX Orc Software* Prime Analytics* RTS Realtime Systems* Photon Trader Random Walk Consulting TradingScreen *The following firms will provide the software to support mass quoting and enhanced market maker protection functionality: Actant, based in Zug, Switzerland; GL TRADE, based in Paris, France; Orc Software, based in Stockholm, Sweden; Prime Analytics, based in Chicago; and, RTS Real Time Systems, based in Frankfurt, Germany. For more information, please visit www.cme.com/optionspartners. Chicago Mercantile Exchange Inc. (www.cme.com) is the largest futures exchange in the United States. 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 moved about $1.5 billion per day in settlement payments in first quarter 2005 and managed $44.4 billion in collateral deposits as of March 31, 2005, including $4.3 billion in deposits for non-CME products. CME is a wholly owned subsidiary of Chicago Mercantile Exchange Holdings Inc. (NYSE: 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 annualreport on Form 10-K, 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. Chicago Mercantile Exchange, CME, the globe logo and CME Globex are registered trademarks of Chicago Mercantile Exchange Inc.

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