Have you been paying attention to shares of Exagen Inc. (XGN) ? Shares have been on the move with the stock up 42.6% over the past month. The stock hit a new 52-week high of $2.78 in the previous session. Exagen Inc. has gained 38.7% since the start of the year compared to the 6.6% move for the Zacks Medical sector and the 5.9% return for the Zacks Medical - Products industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't missed our earnings conse ...