X0306 4 2014-12-29 0 0001381197 Interactive Brokers Group, Inc. IBKR 0001391403 Brody Paul Jonathan ONE PICKWICK PLAZA GREENWICH CT 06830 1 1 0 0 Chief Financial Officer Class A Common Stock 2014-12-29 4 S 0 2698 29.5 D 19456 I By IBG Holdings LLC Class A Common Stock 2014-12-30 4 S 0 2762 29.3 D 16694 I By IBG Holdings LLC Class A Common Stock 546223 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC, that went into effect October 29, 2014. Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC. 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.36 to $29.61, inclusive. The reporting person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (4) and (5) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.11 to $29.44, inclusive. /s/ Xiaoyan (Clare) Zheng as authorized signatory for Paul J. Brody 2014-12-31