Joel Greenblatt acquired 35.8 Thousand Ametek shares worth $6.15 Million. That's 0.06% of their equity portfolio (423rd largest holding). The first Ametek trade was made in Q2 2011. Since then Joel Greenblatt bought shares twenty more times and sold shares on 26 occasions. The stake costed the investor $2.5 Million, netting the investor a gain of 146% so far.