GREENWICH, CONN, October 21, 2010 — Interactive Brokers Group, Inc. (NASDAQ GS: IBKR) an automated global electronic market maker and broker, today reported diluted earnings per share of $0.26 for the quarter ended September 30, 2010, compared to diluted earnings per share of $0.20 for the same period in 2009.

Net revenues were $299 million and income before income taxes was $162 million for this quarter, compared to net revenues of $272 million and income before income taxes of $133 million for the same period in 2009.

Business Highlights

    * 54% pre-tax profit margin for this quarter.
    * $5.1 billion in equity, up from $4.8 billion in the prior quarter.
    * 18% increase in customer accounts and 41% increase in customer equity
       from the year-ago quarter.
    * Cleared DARTs were 320,000 for this quarter, 4% increase from the      
       year-ago quarter.
    * 49% Electronic Brokerage pre-tax profit margin for this quarter.
    * 61% Market Making pre-tax profit margin for this quarter.

"Our results for the quarter stem from the combination of favorable currency movements when looked upon in U.S. dollar terms, continuing headwinds generated by HFTs, declining volumes in the market making area, and superb performance in our brokerage segment relative to our peers," said Thomas Peterffy, our CEO.

Segment Overview

Electronic Brokerage
Electronic Brokerage segment income before income taxes grew 2% in the quarter ended September 30, 2010 compared to the same period in 2009. Pre-tax profit margin was 49% for this quarter. Commissions were up 1% from the prior year period. Commodities contracts volume was 26% higher and securities volume was slightly lower than in the prior year period. In general, profit margins are lower on commodities, compared to securities, due to higher execution and clearing costs at the futures exchanges. In addition, earlier this year we lowered our commissions for U.S. futures by roughly 10%, on an average order. Net interest income increased 71% from the same quarter last year. Customer accounts grew 18% to 151 thousand and customer equity grew 41% to $18.9 billion. Cleared DARTs* grew by 4% from the year-ago quarter to 320 thousand.

Market Making
Market Making segment income before income taxes was $103.9 million in the quarter ended September 30, 2010, an increase of 39% from the same period last year. Pre-tax profit margin was 61% in this quarter, up from 50% in the same period last year. Foreign exchange effects of keeping Group equity in a basket of major currencies we call the GLOBAL are reflected in the market making segment and had a positive impact on trading gains in this quarter. The market making environment was challenging in the third quarter, with lower volatility and continued tight bid/offer spreads. Actual volatility declined relative to implied volatility, increasing the cost of hedging. Market Making options contract volume increased 7% compared to the same period last year and decreased 12% sequentially, which decrease was less than the general decline in industry volumes in North America and Europe.