OMD Remains No. 1, But Carat Had Best Billings Gains Of 2019, Moving To No. 2

Editor's Note: This story and the accompanying chart have been updated from an earlier version due to revisions made by Comvergence. A correction has also been published here.

Omnicom's OMD remained the top U.S. media agency in terms of media billings volume, but Dentsu Aegis Network's ...

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