Mario Gabelli acquired 58.4 Thousand W.R. Berkley shares worth $4.56 Million. That's 0.05% of their equity portfolio (331st largest holding). The first W.R. Berkley trade was made in Q1 2012. Since then Mario Gabelli bought shares thirteen more times and sold shares on 35 occasions. The stake costed the investor $1.05 Million, netting the investor a gain of 336% so far.