X0306 4 2015-12-31 0 0001381197 Interactive Brokers Group, Inc. IBKR 0001391400 Nemser Earl H ONE PICKWICK PLAZA GREENWICH CT 06830 1 1 0 0 Vice Chairman Class A Common Stock 2015-12-31 4 A 0 6632 0 A 102803 D This represents a grant of restricted stock that will vest 10% on 5/9/2016 and 15% on each of the first six anniversaries of 5/9/2016. These shares of Class A Common Stock are owned directly by the reporting person and 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 withheld for tax purposes, or sold previously. /s/ Raymond Bussiere as authorized signatory for Earl H. Nemser 2016-01-05