shares of zions bancorp na zion sank 087 to 5256 wednesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 013 to 375989 and dow jones industrial average djia falling 015 to 3048313 the stocks fall snapped a twoday winning streak zions bancorp na closed 2288 short of its 52week high 7544 which the company achieved on february 10th the stock underperformed when compared to some of its competitors wednesday as us bancorp usb rose 037 to 4650 and western alliance bancorp wal rose 146 to 7099 trading volume 16 m eclipsed its 50day average volume of 16 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