Shares of Amphastar Pharmaceuticals, Inc. (NASDAQ:AMPH – Get Rating) were up 8.9% on Wednesday . The company traded as high as $39.87 and last traded at $39.70. Approximately 317,490 shares traded hands during mid-day trading, an increase of 3% from the average daily volume of 309,719 shares. The stock had previously closed at $36.44. Wall […]