Omnicom Named World's Most Effective Holding Group in 2024 Effie Index®

NEW YORK, June 5, 2025 /PRNewswire/ -- Omnicom (NYSE: OMC) has been named the Most Effective Holding Group in the 2024 Effie Index®, the leading global ranking of marketing effectiveness. This marks the second year in a row -- and third time in four years -- that Omnicom has earned this top honor.Among Omnicom's agency networks, BBDO Worldwide ranked third and DDB Worldwide ranked fourth as the Most Effective Agency Networks. AlmapBBDO was named the Most Effective Agency Office globally for the second conse ...