Interactive Brokers Group, Inc. — Director's Dealing 2017

May 15, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Interactive Brokers Group, Inc. (IBKR)
CIK: 0001381197
Period of Report: 2016-11-01

Reporting Person: Galik Milan (Director, President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-11-01	Class A Common Stock	A	1	$32.63	Acquired	734953	Direct
2016-11-02	Class A Common Stock	A	1	$32.42	Acquired	734954	Direct
2017-04-25	Class A Common Stock	S	1	$34.52	Acquired	849751	Direct

Footnotes

F1: An investment advisor hired by the reporting person inadvertently purchased / sold shares of IBKR as part of a broad based investment strategy.

F2: 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 reported amount also includes the shares inadvertently purchased by an investment advisor hired by the reporting person as part of a broad based investment strategy.

F3: The reported amount also includes the shares sold by an investment advisor hired by the reporting person as part of a broad based investment strategy, as well as shares granted on December 31, 2016 under the 2007 Stock Incentive Plan, previously reported on Form 4 filed with the Securities Exchange Commission on January 4, 2017.