Joel Greenblatt's position in Builders Firstsource is currently worth $13.4 Million. That's 0.14% of their equity portfolio (188th largest holding). The first Builders Firstsource trade was made in Q1 2014. Since then Joel Greenblatt bought shares eighteen more times and sold shares on eighteen occasions. The stake costed the investor $6.59 Million, netting the investor a gain of 104% so far.