Interactive Brokers Group, Inc. Increases Size of and Prices Initial Public Offering

Interactive Brokers Group, Inc. Increases Size of and Prices Initial Public Offering

May 04, 2007

   GREENWICH, Conn., May 4 /Xinhua-PRNewswire/ --
Interactive Brokers Group, Inc. (Nasdaq: IBKR) today
announced an increase in the size of the proposed initial
public offering of shares of its Class A common stock from
34,500,000 shares to 40,000,000 shares and further
announced the pricing of its initial public offering at
$30.01 per share.  As previously disclosed in the
registration statement, all net proceeds from the sale of
shares in the offering will be received by the current
members of IBG LLC, the current holding company for its
electronic market making and brokerage business.

   The Class A common stock will begin trading on May 4,
2007 on the NASDAQ Global Select Market under the symbol
"IBKR."  The offering is expected to close on or
about May 9 2007.
    
    The following is selected information about the
auction:

    --  The auction clearing price was $33.00.
    --  The offering price was $30.01.
    --  A total of 13,504 bids were received in the
auction.
    --  A total of 8,282 bids were successful.
    --  A total of 145,514,807 shares, in total, were bid
for at prices equal
        to or in excess of the offering price.
    --  The pro rata fill rate for bids was 27.5%. 

    W.R. Hambrecht + Co., LLC, HSBC Securities (USA) Inc.,
Fox-Pitt, Kelton Incorporated, Sandler O'Neill + Partners,
L.P. and E-Trade Securities LLC are acting as the placement
agents for the offering which will be made through WR
Hambrecht + Co's OpenIPO(R) auction-based process on a best
efforts basis. The offering will be made only by means of a
prospectus.  A copy of the final prospectus relating to the
offering may be obtained by going to WR Hambrecht's Web
site, http://www.wrhambrecht.com, by calling 800-673-6476,
or by writing to WR Hambrecht + Co, P.O. Box 677, Berwyn,
PA 19312.

    About Interactive Brokers Group, Inc.:

    Interactive Brokers Group, Inc., together with its
subsidiaries (the "Company"), is an automated
global electronic market maker and broker specializing in
routing orders and executing and processing trades in
securities, futures and foreign exchange instruments as a
member of more than 60 electronic exchanges and trading
venues around the world.  The Company provides professional
traders and investors with direct access to options,
futures, stocks, forex and bonds from a single IB Universal
Account(SM).  Interactive Brokers Group, Inc. is a newly
formed Delaware corporation which has been formed to hold
shares in and become the managing member of IBG LLC, the
current holding company for its business.

    A registration statement relating to these securities
was declared effective by the Securities and Exchange
Commission on May 3, 2007. This press release shall not
constitute an offer to sell or a solicitation of an offer
to buy, nor will there be any sale of these securities in
any state or jurisdiction in which such an offer,
solicitation or sale would be unlawful prior to
registration or qualification under the securities laws of
any such state or jurisdiction. 


    For more information, please contact:

     Earl Nemser
     Vice Chairman of Interactive Brokers Group, Inc.
     Tel: [phone]