Interactive Brokers Group, Inc. Files Registration Statement for Proposed Initial Public Offering

Greenwich, Connecticut- November 27, 2006 - Interactive Brokers Group, Inc. (proposed NASDAQ Global Select Market Symbol: IBKR) today announced that it has filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission relating to the proposed initial public offering of shares of its Class A common stock. 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.

WR Hambrecht + Co and E*TRADE FINANCIAL are acting as the placement agents for the offering which will be made through WR Hambrecht + Co's OpenIPO® auction-based process on a best efforts basis. The number of shares to be offered and the price range for the offering have not yet been determined. The public offering will be made only by means of a prospectus which, when available, may be obtained by going to WR Hambrecht’s Web site, 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 AccountSM. 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 has been filed with the U.S. Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. 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.