shares of amgen inc amgn slumped 075 to 23295 tuesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 130 to 400287 and the dow jones industrial average djia rising 098 to 3256060 amgen inc closed 6372 below its 52week high 29667 which the company reached on november 8th the stock underperformed when compared to some of its competitors tuesday as johnson  johnson jnj remained unchanged and pfizer inc pfe fell 037 to 4066 trading volume 21 m remained 449013 below its 50day average volume of 26 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