Mario Gabelli's position in Janus Henderson Group plc is currently worth $20.7M. That's 0.19% of their equity portfolio (147th largest holding). The first Janus Henderson Group plc trade was made in Q2 2017. Since then Mario Gabelli bought shares six more times and sold shares on 29 occasions. The stake costed the investor $13.1M, netting the investor a gain of 57% so far.