Amphastar Pharmaceuticals (AMPH) closed the most recent trading day at $51.91, moving +1.29% from the previous trading session. This change lagged the S&P 500's 2.11% gain on the day. Meanwhile, the Dow gained 1.18%, and the Nasdaq, a tech-heavy index, added 2.96%. Shares of the specialty pharmaceutical company witnessed a loss of 7.19% over the previous month, trailing the performance of the Medical sector with its gain of 3.98% and the S&P 500's gain of 3.08%. Market participants will be closely following ...