| SC 13G | 2008-02-14 | AXA FINANCIAL INC | Interactive Brokers Group, Inc. | 2,869,267 | 7.1% | EDGAR |
| SC 13G | 2008-02-14 | ARTIS CAPITAL MANAGEMENT, L.P. | Interactive Brokers Group, Inc. | 2,648,924 | 6.6% | EDGAR |
| SC 13G/A | 2008-02-13 | PRICE T ROWE ASSOCIATES INC /MD/ | Interactive Brokers Group, Inc. | 4,406,750 | 10.9% | EDGAR |
| SC 13G/A | 2007-12-10 | PRICE T ROWE ASSOCIATES INC /MD/ | Interactive Brokers Group, Inc. | 4,062,350 | 10.1% | EDGAR |
| SC 13G | 2007-06-11 | PRICE T ROWE ASSOCIATES INC /MD/ | Interactive Brokers Group, Inc. | 6,625,100 | 16.4% | EDGAR |
| SC 13D | 2007-05-17 | IBG Holdings LLC | Interactive Brokers Group, Inc. | 360,000,000 | 90.0% | EDGAR |