Ken Griffin's position in Builders Firstsource is currently worth $16.9 Million. That's 0.02% of their equity portfolio (910th largest holding). The first Builders Firstsource trade was made in Q2 2013. Since then Ken Griffin bought shares 47 more times and sold shares on 34 occasions. The stake costed the investor $6.53 Million, netting the investor a gain of 159% so far.