Mario Gabelli acquired 59 Thousand W.R. Berkley shares worth $4.66 Million. That's 0.05% of their equity portfolio (328th 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 34 occasions. The stake costed the investor $1.06 Million, netting the investor a gain of 341% so far.