Joel Greenblatt acquired 135k Clean Harbors shares worth $38.6M. That's 0.11% of their equity portfolio (214th largest holding). The first Clean Harbors trade was made in Q1 2014. Since then Joel Greenblatt bought shares 24 more times and sold shares on sixteen occasions. The stake costed the investor $19.6M, netting the investor a gain of 97% so far.