Interactive Brokers Group Reports Brokerage Metrics for September 2011 and New "GLOBAL" Composition

GREENWICH, CT, October 3, 2011 — Interactive Brokers Group, Inc. (NASDAQ GS: IBKR) an automated global electronic broker and market maker, today reported its Electronic Brokerage monthly performance metrics for September and changes in the composition of its currency exposure management unit.

Brokerage Metrics for September

More information, including historical results for each of the above metrics, can be found on the investor relations page of the Company’s corporate web site,

Changes in the composition of the “GLOBAL” currency exposure management unit

The Company actively manages its global currency exposure by maintaining its equity in proportion to a defined basket of currencies, which it refers to as the "GLOBAL". Approximately half of the firm’s equity is denominated in currencies other than U.S. dollars. The composition of the GLOBAL is based on the relative importance of the constituent currencies in the world economy and the Company’s businesses. As a result of a periodic assessment, the Company has determined to expand the number of currencies in the GLOBAL and realign the relative weights of each component to better reflect the global diversification of its businesses.

The new composition contains 16 currencies, up from 6 in the prior composition. The Company currently transacts business and is required to manage balances in each of these 16 currencies. The new composition is in effect as of the close of business on September 30, 2011 and the conversion to the new targeted currency holdings is taking place over a short time period.

The changes will not affect financial statement reporting, which, pursuant to GAAP guidelines, allows the reporting of all currency translation effects in the Statement of Comprehensive Income.

The table below displays the component changes in detail.

GLOBAL currency exposure management unit

About Interactive Brokers Group, Inc.:
Interactive Brokers Group, Inc., together with its subsidiaries, is an automated global electronic broker that specializes in catering to financial professionals by offering state-of-the-art trading technology, superior execution capabilities, worldwide electronic access, and sophisticated risk management tools at exceptionally low costs. The brokerage trading platform utilizes the same innovative technology as the Company’s market making business, which executes and processes trades in securities, futures and foreign exchange instruments on more than 90 electronic exchanges and trading venues around the world. As a market maker, we provide liquidity at these marketplaces and, as a broker, we provide professional traders and investors with electronic access to stocks, options, futures, forex, bonds and mutual funds from a single IB Universal AccountSM. Employing proprietary software on a global communications network, Interactive Brokers Group continuously integrates its software with a growing number of exchanges and trading venues into one automatically functioning, computerized platform that requires minimal human intervention.

Cautionary Note Regarding Forward-Looking Statements:
The foregoing information contains certain forward-looking statements that reflect the company's current views with respect to certain current and future events and financial performance. These forward-looking statements are and will be, as the case may be, subject to many risks, uncertainties and factors relating to the company's operations and business environment which may cause the company's actual results to be materially different from any future results, expressed or implied, in these forward-looking statements. Any forward-looking statements in this release are based upon information available to the company on the date of this release. The company does not undertake to publicly update or revise its forward-looking statements even if experience or future changes make it clear that any statements expressed or implied therein will not be realized. Additional information on risk factors that could potentially affect the company's financial results may be found in the company's filings with the Securities and Exchange Commission.

For Interactive Brokers Group, Inc. Media: Caitlin Duffy, 203-913-1369 or Investors: Deborah Liston, 203-618-4070.