Joel Greenblatt's position in Marathon Petroleum is currently worth $15.8 Million. That's 0.27% of their equity portfolio (44th largest holding). The first Marathon Petroleum trade was made in Q1 2012. Since then Joel Greenblatt bought shares 21 more times and sold shares on 22 occasions. The stake costed the investor $4.43 Million, netting the investor a gain of 256% so far.