shares of western union co wu inched 045 higher to 1105 wednesday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 142 to 402781 and the dow jones industrial average djia rising 100 to 3271760 this was the stocks second consecutive day of gains western union co closed 892 short of its 52week high 1997 which the company achieved on april 21st trading volume 57 m remained 39 million below its 50day average volume of 96 m