X0304 4 2012-02-01 0 0001381197 Interactive Brokers Group, Inc. IBKR 0001391404 Galik Milan ONE PICKWICK PLAZA GREENWICH CT 06830 1 1 0 0 SVP Software Development Class A Common Stock 2012-02-01 4 S 0 800 15.13 D 880584 D Class A Common Stock 2012-02-02 4 S 0 800 15.12 D 879784 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on January 23, 2012. These shares represent the aggregate number of shares of restricted stock from awards granted on May 9, 2007 and annually thereafter, starting December 31, 2007 through December 31, 2011, including a special one-time grant on January 6, 2012, less vested shares that were sold for withholding tax purposes and vested shares sold pursuant to a Rule 10b5-1 trading plan. /s/ Raymond Bussiere as Authroized Signatory for Milan Galik 2012-02-03