Mario Gabelli's position in Interactive Brokers Group is currently worth $937 Thousand. That's 0.01% of their equity portfolio (545th largest holding). The first Interactive Brokers Group trade was made in Q2 2007. Since then Mario Gabelli bought shares eighteen more times and sold shares on 22 occasions. The stake costed the investor $514 Thousand, netting the investor a gain of 82% so far.