Jeremy Grantham's position in Owens Corning is currently worth $18.5 Million. That's 0.08% of their equity portfolio (186th largest holding). The first Owens Corning trade was made in Q3 2017. Since then Jeremy Grantham bought shares fifteen more times and sold shares on eight occasions. The stake costed the investor $10.4 Million, netting the investor a gain of 77% so far.