George Soros acquired 240 Thousand Interactive Brokers Group shares worth $18.8 Million. That's 0.85% of their equity portfolio (33rd largest holding). The first Interactive Brokers Group trade was made in Q3 2011. Since then George Soros bought shares four more times and sold shares on one occasions. The stake costed the investor $18.2 Million, netting the investor a gain of 3.7% so far.