shares of omnicom group inc omc slid 054 to 9280 monday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 002 to 419263 and the dow jones industrial average djia falling 042 to 3328658 this was the stocks second consecutive day of losses omnicom group inc closed 398 short of its 52week high 9678 which the company achieved on april 18th the stock underperformed when compared to some of its competitors monday as trade desk inc cl a ttd rose 254 to 6852 and gartner inc it rose 019 to 33140 trading volume 934471 remained 10 million below its 50day average volume of 20 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