X0306 4 2012-07-24 0 0001381197 Interactive Brokers Group, Inc. IBKR 0001554132 Gates Richard J. 121 N. WALNUT ST. SUITE 320 WEST CHESTER PA 19380 1 0 0 0 Class A Common Stock 2012-07-24 4 P 0 5000 13.48 A 5000 D This represents the average price paid for the securities, ranging from 13.47 to 13.49, in open market transactions. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. /s/ Raymond Bussiere as authorized signatory for Richard J. Gates 2012-07-25