News Release

IDG's Computerworld Names CME to Annual List of Best Places to Work in Information Technology for Second Consecutive Year

Mon Jun 19 2006

CHICAGO, June 19 /PRNewswire-FirstCall/ -- CME, the world's largest and most diverse financial exchange, today announced that it has been selected by IDG's Computerworld, the "Voice of IT Management," as one of the top workplaces for information technology (IT) professionals for the second consecutive year. This honor is part of the weekly IT publication's 13th annual Best Places to Work in IT survey, which was published in the June 19 issue and online at http://www.computerworld.com/ . CME is the only financial exchange to receive this honor, and was also acknowledged for career development and the diversity of its IT workforce.

Since 1994, Computerworld's annual "Best Places to Work in IT" feature has ranked the top 100 work environments for technology professionals, based on a comprehensive questionnaire regarding company offerings in categories such as benefits, diversity, career development, training and retention. In addition, this year Computerworld surveyed more than 27,000 IT workers for the list, and their responses factored heavily in determining the rankings.

"We are honored to receive this award and the recognition it brings to our team and our CME Globex® electronic trading platform, the only electronic trading system to offer global access to every major asset class," said CME CEO Craig Donohue. "Our continued investments in technology allow us to set the pace of innovation in our industry and deliver superior access, functionality and reliability to our customers around the world."

"CME is extremely proud of our dedicated and talented technology team and the significant contributions they have made in positioning our firm as a leading applied technology company," said Phupinder Gill, CME President and Chief Operating Officer.

Some of the factors that contributed to CME's recognition by Computerworld include the following:

   -- CME employs over 550 people in its Technology Division; approximately
      40 percent of all employees;

   -- CME is the only financial exchange in the world that operates
      virtually 24 hours every trading day, which means every aspect of the
      exchange is driven or supported by technology and,

   -- Electronic trading represents more than 70 percent of CME's total
      volume in 2006, versus only 15 percent in 2000.  In that same
      timeframe, average daily volume has nearly sextupled from 917,000 to
      5.9 million contracts traded.

"The recipients of this year's Best Places to Work represent a diversity of industries from technology to finance to pharmaceuticals," said Don Tennant, editor in chief of Computerworld. "However, each organization is united by a common theme -- they embrace the value of IT talent within the workplace and the impressive contributions that these professionals make on a daily basis."

Other companies that Computerworld ranked among the Best Places to Work include Fed Ex, General Mills and The Vanguard Group. To view the complete list of the Best Places to Work in IT please visit, http://www.computerworld.com/action/article.do?command=viewArticleBasic&articl eId=111558 .

About Computerworld

Computerworld, the "Voice of IT Management," is the most trusted source for the critical information needs of senior IT management. Computerworld's integrated offerings form the U.S.-based hub of the world's largest (58-edition) global IT media network through its weekly publication, Computerworld.com Web site, focused conference series and custom research. In the past five years alone, Computerworld has won more than 100 print and online awards for editorial and design excellence, surpassing its direct competition by an order of magnitude. Recognition includes the 2004 Magazine of the Year Award from the American Society of Business Publication Editors and a Jesse H. Neal Award for "Best News Coverage." In print since 1967, Computerworld is the source for information technology management, with a guaranteed rate base of 180,050, a total print audience of 1,138,000 (IntelliQuest CIMS 2004 Business Influencer Study) and an online audience of over 1.1 million unique monthly visitors (DoubleClick).

Computerworld is a business unit of International Data Group (IDG), the world's leading technology media, research and events company. A privately held company, IDG publishes more than 300 magazines and newspapers, including Bio-IT World, CIO, CSO, Computerworld, GamePro, InfoWorld, Network World and PC World. The company features the largest network of technology-specific Web sites, with more than 400 around the world. IDG is also a leading producer of more than 170 computer-related events worldwide, including LinuxWorld Conference & Expo®, Macworld Conference & Expo®, DEMO® and IDC Directions. IDC provides global market research and advice through offices in 50 countries. Company information is available at http://www.idg.com/ .

About CME

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. 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: CME

CONTACT: Media Contacts, Allan Schoenberg, +1-312-930-8189, or Laurie
Bischel, +1-312-648-8698, news@cme.com , or Investor Contact, John Peschier,
+1-312-930-8491, all of CME

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

Corporate Communications

+1 312 930 3434
Email