shares of zions bancorp na zion dropped 050 to 6313 thursday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 030 to 477873 and dow jones industrial average djia falling 025 to 3639808 the stocks fall snapped a sixday winning streak zions bancorp na closed 512 short of its 52week high 6825 which the company reached on november 24th the stock underperformed when compared to some of its competitors thursday as us bancorp usb rose 002 to 5615 and western alliance bancorp wal fell 023 to 10779 trading volume 413137 remained 843187 below its 50day average volume of 13 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