Joel Greenblatt acquired 29.9 Thousand Clean Harbors shares worth $6.78 Million. That's 0.07% of their equity portfolio (398th largest holding). The first Clean Harbors trade was made in Q1 2014. Since then Joel Greenblatt bought shares twenty more times and sold shares on fifteen occasions. The stake costed the investor $2.64 Million, netting the investor a gain of 157% so far.