George Soros acquired 223 Thousand Interactive Brokers Group shares worth $41.1 Million. That's 1.29% of their equity portfolio (18th largest holding). The first Interactive Brokers Group trade was made in Q3 2011. Since then George Soros bought shares eight more times and sold shares on three occasions. The stake costed the investor $20.6 Million, netting the investor a gain of 99% so far.