X0306 4 2014-09-17 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 2014-09-17 4 S 0 900 25.27 D 720317 D Class A Common Stock 2014-09-18 4 S 0 900 26.15 D 719417 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person which went into effect February 1, 2014. These shares represent the aggregate number of shares of restricted stock from awards granted under the 2007 Stock Incentive Plan since its inception, 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 authorized signatory for Milan Galik 2014-09-19