Evolent Health (EVH) shares soared 12.8% in the last trading session to close at $21.72. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 11.1% loss over the past four weeks.Evolent Health's conservative approach to forecasting prior authorization data is expected to be a significant factor that could lead to second-quarter results landing at the higher end of the company's guidance range.This health care software and consulting s ...