shares of union pacific corp unp shed 122 to 21978 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 063 to 413215 and dow jones industrial average djia falling 067 to 3299012 the stocks fall snapped a fiveday winning streak union pacific corp closed 5916 short of its 52week high 27894 which the company reached on march 31st the stock underperformed when compared to some of its competitors tuesday as canadian national railway co cni fell 025 to 11378 csx corp csx fell 081 to 3179 and norfolk southern corp nsc fell 057 to 23966 trading volume 44 m eclipsed its 50day average volume of 35 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