Joel Greenblatt acquired 15.4 Thousand Ametek shares worth $2.73 Million. That's 0.05% of their equity portfolio (478th largest holding). The first Ametek trade was made in Q2 2011. Since then Joel Greenblatt bought shares eighteen more times and sold shares on 24 occasions. The stake costed the investor $994 Thousand, netting the investor a gain of 175% so far.