A strong stock as of late has been Janus Henderson Group plc (JHG) . Shares have been marching higher, with the stock up 3.4% over the past month. The stock hit a new 52-week high of $49.42 in the previous session. Janus Henderson Group has gained 9% since the start of the year compared to the 14.2% move for the Zacks Finance sector and the -7.6% return for the Zacks Financial - Investment Management industry.What's Driving the Outperformance?The stock has an impressive record of positive earnings surprises ...