Exagen Inc. (XGN) shares soared 5.5% in the last trading session to close at $7.32. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 1.7% loss over the past four weeks.The sharp upsurge in XGN shares can be attributed to positive market sentiment following bullish analyst coverage and growing confidence in Exagen’s clinical testing platform. On July 23, Craig-Hallum initiated coverage with a Buy rating and a $12 price target, impl ...