CONFIRMING STATEMENT



 This statement confirms that Jay C. Hoag, Richard H. Kimball, John L. Drew, Jon

Q. Reynolds, Jr., William J.G. Griffith IV, Robert W. Trudeau, Technology Crossover

Management VI, L.L.C. and TCV VI, L.P.("Filers"), have authorized and designated Robert C. Bensky,

Carla S. Newell, Patrick D. Reilly and Frederic D. Fenton to execute and file on

the Filers' behalf all Forms 3, 4 and 5 (including any amendments thereto) that the Filers

may be required to file with the U.S. Securities and Exchange Commission as a result of

the Filers' ownership of or transactions in securities of Interactive Brokers Group, Inc.  The

authority of Robert C. Bensky, Carla S. Newell, Patrick D. Reilly and Frederic D. Fenton under

this statement shall continue until the Filers are no longer required to file Forms 3, 4 and 5 with regard to their

ownership of or transactions in securities of Interactive Brokers Group, Inc., unless revoked in

writing.  The Filers acknowledge that Robert C. Bensky, Carla S. Newell, Patrick D. Reilly and Frederic D. Fenton

are not assuming any of the Filers' responsibilities to comply with Section 16 of the Securities

Exchange Act of 1934.



Date:  July 30, 2009





                                s/  Jay C. Hoag

         Jay C. Hoag



    s/  Richard H. Kimball

         Richard H. Kimball



    s/  John L. Drew

         John L. Drew



    s/  Jon Q. Reynolds, Jr.

         Jon Q. Reynolds, Jr.



                                s/  William J. G. Griffith IV

         William J.G. Griffith IV



    s/  Robert W. Trudeau

         Robert W. Trudeau



     s/  Technology Crossover Management VI, L.L.C.

         Technology Crossover Management VI, L.L.C.



    s/  TCV VI, L.P.

         TCV VI, L.P.