X0303 4 2010-12-31 0 0001381197 Interactive Brokers Group, Inc. IBKR 0001391401 Frank Thomas AJ ONE PICKWICK PLAZA GREENWICH CT 06830 0 1 0 0 Chief Information Officer Class A Common Stock 2010-12-31 4 A 0 58114 0 A 186070 D This represents a grant of restricted stock that will vest 10% on 5/9/2011 and 15% on each of the first six anniversaries of 5/9/2011. These shares represent the aggregate number of shares of restricted stock from awards granted on May 9, 2007, December 31, 2007, December 31, 2008, December 31, 2009 and December 31, 2010, less vested shares that were sold for withholding tax purposes. /s/ Thomas AJ Frank 2011-01-04