Interpublic and Omnicom join, putting top ad buyers on same side

Variety reported Interpublic and Omnicom have joined. Its Power 25 Marketers and Advertisers list, published 2 October 2026, names IPG Mediabrands' Maureen Bosetti and Omnicom Media Group's Katie Klein, the chief investment officers who decide where client budgets go. The pair now sit on the same corporate side.