Amphastar Pharmaceuticals (NASDAQ:AMPH – Get Free Report) and PTC Therapeutics (NASDAQ:PTCT – Get Free Report) are both mid-cap medical companies, but which is the superior stock? We will compare the two businesses based on the strength of their institutional ownership, analyst recommendations, profitability, risk, earnings, dividends and valuation. Volatility and Risk Amphastar Pharmaceuticals has a […]