Joel Greenblatt acquired 23.2 Thousand Clean Harbors shares worth $4.94 Million. That's 0.08% of their equity portfolio (361st largest holding). The first Clean Harbors trade was made in Q1 2014. Since then Joel Greenblatt bought shares seventeen more times and sold shares on fifteen occasions. The stake costed the investor $1.89 Million, netting the investor a gain of 161% so far.