Joel Greenblatt acquired 28.4 Thousand Interactive Brokers Group shares worth $5.26 Million. That's 0.05% of their equity portfolio (468th largest holding). The first Interactive Brokers Group trade was made in Q2 2016. Since then Joel Greenblatt bought shares eleven more times and sold shares on ten occasions. The stake costed the investor $1.88 Million, netting the investor a gain of 181% so far.