shares of amgen inc amgn slid 116 to 21144 monday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 130 to 430046 and dow jones industrial average djia falling 094 to 3400292 amgen inc closed 6525 below its 52week high 27669 which the company achieved on january 28th the stock demonstrated a mixed performance when compared to some of its competitors monday as johnson  johnson jnj fell 078 to 15922 roche holding ag part cert rhhvf rose 088 to 37577 and pfizer inc pfe fell 119 to 4242 trading volume 29 m eclipsed its 50day average volume of 25 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use