Omnicom named world's most effective holding group

New york , june 5, 2024 /prnewswire/ -- omnicom (nyse: omc) has been named the most effective holding group in the 2023 effie index®, the 13th annual ranking of the companies behind the world's most effective marketing initiatives. this is the second time within the past three years that omnicom has received the coveted global title.

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