(Logo: http://www.newscom.com/cgi-bin/prnh/20020911/ONECHICAGOLOGO)    Open interest stood at 213,707 contracts in June 2009.    The top five contracts by volume in June were:       Citigroup, Inc.                     C1C                     31,246    Pfizer                              PFE1C                   30,088    Abbott Laboratories                 ABT1C                   14,043    Verizon Communications, Inc         VZ1C                    11,181    Johnson and Johnson                 JNJ1C                   10,248    About OneChicago:   

The Exchange lists 1150 futures on single stocks and 53 Exchange Traded Funds. OneChicago is a joint venture of IB Exchange Corp., the Chicago Board Options Exchange Incorporated(R) (CBOE(R)), and CME Group. All products are electronically traded on the CBOEdirect(R) match engine and accessible through the CBOEdirect(R) and CME Globex(R) platforms. Security futures can be traded out of either securities or futures accounts.

For more information about OneChicago and its products, and to view the June 2009 Volume Report, please access the OneChicago Web site at http://www.onechicago.com/

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OneChicago, LLC

CONTACT: OneChicago, LLC, +1-312-424-8500

Web Site: http://www.onechicago.com/

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