In the current market session, Amgen Inc. (NASDAQ: AMGN) share price is at $295. 58, after a 0. 08% drop. Over the past month, the stock increased by 3. 56%, but over the past year, it actually fell by 6. 68%. With good short-term performance like this, and questionable long-term performance, long-term shareholders might want to start looking into the company’s price-to-earnings ratio. Comparing Amgen P/E Against Its Peers The P/E ratio measures the current share price to the company’s EPS. It is used by long-term investors to analyze the company’s current performance against it’s past earnings, historical data and aggregate market .