Shares of Interactive Brokers Group (NASDAQ:IBKR) remain up today, after the company delivered a phenomenal earnings report for the quarter. Both revenue and earnings per share were up in a big way, and the company's pre-tax profit margin was up to an astonishing 61%.

The company saw multiple segments of its business jump upward, which drove the powerful growth. The company saw strong performance of its brokerage business this quarter, with customer accounts, trading activity and net pre-tax income all up. Finally, the company's market-making business is also performing particularly strongly, reporting a $67 million pre-tax profit, which was a $32 million loss year over year.

So after this quarter's incredible performance, is Interactive Brokers a buy today? On Thursday's edition of Stock of the Day, Motley Fool analyst Sara Hov says she really likes this stock as a buy today. Not only is she a fan of the high profitability of the company, Sara also likes this stock's high insider ownership and its growth prospects, particularly for the company's brokerage business.

Interactive Brokers Group is a service provider for the Motley Fool.