Joel Greenblatt's position in Owens Corning is currently worth $5.45 Million. That's 0.05% of their equity portfolio (457th largest holding). The first Owens Corning trade was made in Q4 2010. Since then Joel Greenblatt bought shares 24 more times and sold shares on 21 occasions. The stake costed the investor $3.21 Million, netting the investor a gain of 70% so far.