GREENWICH, Conn.--(BUSINESS WIRE)--Interactive Brokers Group, Inc. (NASDAQ GS: IBKR) plans to announce its second quarter financial results on Tuesday, July 21, 2015, in a release that will be issued at approximately 4:00 pm (ET). The press release will also be available on the company's web site, www.interactivebrokers.com/ir. A conference call to discuss the company's results will be held at 4:30 pm (ET) on that day, July 21. Members of the public who would like to listen to the conference ca