shares of omnicom group inc omc rallied 197 to 9048 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 third consecutive day of gains omnicom group inc closed 604 short of its 52week high 9652 which the company reached on february 8th the stock demonstrated a mixed performance when compared to some of its competitors wednesday