 NEW YORK, Oct. 11, 2021 PRNewswire -- Omnicom Group Inc. NYSE: OMC will publish its third quarter and year-to-date 2021 results on Tuesday, October 19, 2021 after the New York Stock Exchange closes. The company will also host a conference call to review the financial results on Tuesday, October 19, 2021 starting at 4:30 p.m. 