shares of omnicom group inc omc advanced 189 to 8614 tuesday on what proved to be an allaround mixed trading session for the stock market with the dow jones industrial average djia rising 031 to 3373396 and the sp 500 index spx falling 007 to 401695 this was the stocks third consecutive day of gains omnicom group inc closed 547 below its 52week high 9161 which the company reached on february 10th the stock outperformed some of its competitors tuesday as trade desk inc cl a ttd rose 091 to