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., TCV VI, L.P. and TCV Member Fund, L.P. ("Filers"), have

authorized and designated Robert C. Bensky and Carla S. Newell 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 MarketAxess Holdings, Inc.  The

authority of Robert C. Bensky and Carla S. Newell 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 MarketAxess Holdings, Inc., unless revoked in

writing.  The Filers acknowledges that Robert C. Bensky and Carla S. Newell are not

assuming any of the Filers' responsibilities to comply with Section 16 of the Securities

Exchange Act of 1934.



Date:  July 17, 2008





                                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.



    s/  TCV Member Fund, L.P.

         TCV Member Fund, L.P.