Ken Griffin acquired 74.5 Thousand W.R. Berkley shares worth $5.5 Million. That's 0.01% of their equity portfolio (1563rd largest holding). The first W.R. Berkley trade was made in Q2 2013. Since then Ken Griffin bought shares 54 more times and sold shares on 51 occasions. The stake costed the investor $4.46 Million, netting the investor a gain of 23% so far.