Joel Greenblatt acquired 172k Packaging Corp Of America shares worth $37.2M. That's 0.21% of their equity portfolio (43rd largest holding). The first Packaging Corp Of America trade was made in Q3 2012. Since then Joel Greenblatt bought shares 25 more times and sold shares on 25 occasions. The stake costed the investor $29.5M, netting the investor a gain of 26% so far.