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WPP’s GroupM agency MediaCom just lost a longstanding client — and it marks the latest casualty in the accelerating trend of brands taking media in-house

German chemical and pharmaceutical company Bayer is putting its global media business up for review, ending its longstanding relationship with GroupM agency MediaCom, part of ad holding company WPP, said a source with direct knowledge of the situation. The Aleve and Alka-Seltzer maker informed MediaCom of its decision last week […]
WPP’s GroupM agency MediaCom just lost a longstanding client — and it marks the latest casualty in the accelerating trend of brands taking media in-house