Interactive Brokers Group, Inc. — Director's Dealing 2010

May 18, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Interactive Brokers Group, Inc. (IBKR)
CIK: 0001381197
Period of Report: 2010-05-14

Reporting Person: Nemser Earl H (Director, Vice Chariman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-14	Class A Comon Stock	F	1847	$16.74	Disposed	41660	Direct

Footnotes

F1: The price represents the closing price of the issuer's Class A common stock as of May 7, 2010, the last business day prior to the vesting date of May 9, 2010.

F2: These shares represent the aggregate number of shares of restricted stock from awards granted on May 9, 2007, December 31, 2007, December 31, 2008 and December 31, 2009, less vested shares that were sold for withholding tax purposes.