shares of amgen inc amgn slumped 053 to 23938 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 067 to 403061 and dow jones industrial average djia falling 057 to 3209899 this was the stocks second consecutive day of losses amgen inc closed 1907 below its 52week high 25845 which the company reached on april 11th despite its losses the stock outperformed some of its competitors monday as johnson  johnson jnj fell 077 to 16300 roche holding ag part cert rhhvf fell 109 to 32108 and pfizer inc pfe fell 126 to 4623true trading volume 21 m remained 832876 below its 50day average volume of 29 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