Amphastar Pharmaceuticals (AMPH) closed at $54.94 in the latest trading session, marking a -0.81% move from the prior day. The stock's performance was behind the S&P 500's daily loss of 0.06%. At the same time, the Dow added 0.35%, and the tech-heavy Nasdaq lost 0.76%. Shares of the specialty pharmaceutical company witnessed a loss of 10.45% over the previous month, trailing the performance of the Medical sector with its gain of 1.65% and the S&P 500's gain of 3.36%. Analysts and investors alike will be kee ...