Mario Gabelli acquired 91.2k W.R. Berkley shares worth $6.29M. That's 0.06% of their equity portfolio (318th largest holding). The first W.R. Berkley trade was made in Q1 2012. Since then Mario Gabelli bought shares sixteen more times and sold shares on 40 occasions. The stake costed the investor $1.77M, netting the investor a gain of 256% so far.