Joel Greenblatt acquired 99.4k F5 shares worth $31.2M. That's 0.18% of their equity portfolio (75th largest holding). The first F5 trade was made in Q3 2011. Since then Joel Greenblatt bought shares 29 more times and sold shares on 25 occasions. The stake costed the investor $12.2M, netting the investor a gain of 155% so far.