Ken Griffin's position in Interactive Brokers Group is currently worth $39.6 Million. That's 0.04% of their equity portfolio (527th largest holding). The first Interactive Brokers Group trade was made in Q2 2013. Since then Ken Griffin bought shares 55 more times and sold shares on 42 occasions. The stake costed the investor $25.3 Million, netting the investor a gain of 56% so far.