CBOT to Present at William Blair & Company Conference

CHICAGO, June 21, 2006 - CBOT Holdings, Inc., holding company for the Chicago Board of Trade (CBOT^®) (NYSE: BOT), one of the world’s leading derivatives exchanges, today announced that Bernard Dan, President and Chief  Executive Officer, and Glen Johnson, Senior Vice President and Chief Financial Officer, will present at the following Investor Conference:

William Blair & Company 26^th Annual Growth Stock Conference

Date:         Thursday, June 29, 2006
Time:         9:10 a.m.(Central Time)
Duration:   30 minutes
Location:   Four Seasons Hotel, Chicago, IL

The presentation will be broadcast by live audio over the Internet and can be accessed via the investor relations events and presentations section of the CBOT Holdings website at http://www.cbot.com. Accompanying slides will also be available in the same location. Please allow extra time prior to the presentation to visit the site to download the software required to listen to the broadcast.   The audio webcast will be available for replay at the same address approximately 24 hours following its conclusion for 30 days.

About the CBOT

As one of the leading global derivative exchanges, the Chicago Board of Trade provides a diverse mix of financial, equity and commodity futures and options-on-futures products.  Building on its 158-year history, the CBOT continues to advance into the future using the strength of deep liquidity, market integrity and member-trader expertise.  Using superior trading technology in both electronic and open-auction trading platforms, the CBOT provides premier customer service to risk managers and investors worldwide.  For more information, visit our website at www.cbot.com.

Investor Contacts:
Deborah Koopman
312.789.8532
dkoopman1@cbot.com

Pam Washington
312.341.3439
pwashingt1@cbot.com

Media Contact:
Melissa Jarmel
312.435.7137
mjarmel1@cbot.com