shares of zions bancorp na zion slid 470 to 6617 wednesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 097 to 453276 and dow jones industrial average djia falling 096 to 3502865 this was the stocks second consecutive day of losses zions bancorp na closed 504 short of its 52week high 7121 which the company reached on january 10th the stock demonstrated a mixed performance when compared to some of its competitors wednesday as us bancorp usb fell 775 to 5737 and western alliance bancorp wal fell 466 to 11340 trading volume 19 m eclipsed its 50day average volume of 12 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