United Therapeutics (UTHR) shares soared 3.5% in the last trading session to close at $286.14. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 7.7% loss over the past four weeks.This rise can be attributed to a recovery in the company's share price, which had been declining over the past couple of sessions following positive results from a pulmonary arterial hypertension (PAH) study conducted by Insmed. The study evaluated a prod ...