shares of union pacific corp unp slid 166 to 24212 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 002 to 439169 and dow jones industrial average djia falling 011 to 3441169 union pacific corp closed 3682 below its 52week high 27894 which the company achieved on march 31st the stock underperformed when compared to some of its competitors monday as canadian national railway co cni fell 069 to 12631 csx corp csx fell 088 to 3475 and norfolk southern corp nsc fell 021 to 26251 trading volume 32 m remained 713507 below its 50day average volume of 39 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