Joel Greenblatt's position in Martin Marietta Materials is currently worth $2.98 Million. That's 0.05% of their equity portfolio (509th largest holding). The first Martin Marietta Materials trade was made in Q4 2015. Since then Joel Greenblatt bought shares fourteen more times and sold shares on fourteen occasions. The stake costed the investor $1.93 Million, netting the investor a gain of 54% so far.