Joel Greenblatt acquired 162k F5 shares worth $65.8M. That's 0.18% of their equity portfolio (68th largest holding). The first F5 trade was made in Q3 2011. Since then Joel Greenblatt bought shares 32 more times and sold shares on 25 occasions. The stake costed the investor $21.7M, netting the investor a gain of 204% so far.