Joel Greenblatt acquired 49.3 Thousand Iron Mountain shares worth $4.03 Million. That's 0.06% of their equity portfolio (417th largest holding). The first Iron Mountain trade was made in Q4 2015. Since then Joel Greenblatt bought shares thirteen more times and sold shares on twelve occasions. The stake costed the investor $2.51 Million, netting the investor a gain of 61% so far.