Amgen (AMGN) closed at $270.90 in the latest trading session, marking a +0.76% move from the prior day. This move outpaced the S&P 500's daily gain of 0.63%. Meanwhile, the Dow gained 0.2%, and the Nasdaq, a tech-heavy index, added 0.82%.Heading into today, shares of the world's largest biotech drugmaker had lost 5.23% over the past month, lagging the Medical sector's gain of 0.91% and the S&P 500's gain of 1.76% in that time.The investment community will be closely monitoring the performance of Amgen in it ...