shares of amgen inc amgn slumped 010 to 22743 friday on what proved to be an allaround mixed trading session for the stock market with the dow jones industrial average djia rising 033 to 3450903 and the sp 500 index spx falling 010 to 450542 amgen inc closed 6924 below its 52week high 29667 which the company achieved on november 8th the stock underperformed when compared to some of its competitors friday as johnson  johnson jnj rose 067 to 15987 and pfizer inc pfe rose 072 to 3632 trading volume 20 m remained 525836 below 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