shares of union pacific corp unp slid 309 to 22168 wednesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 108 to 411577 and dow jones industrial average djia falling 081 to 3291090 the stocks fall snapped a twoday winning streak union pacific corp closed 5726 below its 52week high 27894 which the company achieved on march 31st the stock underperformed when compared to some of its competitors wednesday as canadian national railway co cni fell 102 to 11487 csx corp csx fell 230 to 3181 and norfolk southern corp nsc fell 264 to 24281 trading volume 24 m remained 952855 below its 50day average volume of 34 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