shares of zions bancorp na zion inched 046 higher to 5062 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 030 to 397015 and dow jones industrial average djia falling 071 to 3265670 this was the stocks fourth consecutive day of gains zions bancorp na closed 2063 short of its 52week high 7125 which the company reached on march 29th the stock outperformed some of its competitors tuesday as wells fargo  co wfc fell 002