Ken Griffin's position in Builders Firstsource is currently worth $15.4 Million. That's 0.02% of their equity portfolio (870th largest holding). The first Builders Firstsource trade was made in Q2 2013. Since then Ken Griffin bought shares 55 more times and sold shares on 38 occasions. The stake costed the investor $4.05 Million, netting the investor a gain of 280% so far.