Mediacom

Was one of the top five global media agencies by billings, operating within WPP's GroupM network before merging into EssenceMediacom in 2023.

MediaCom was one of the world's largest media agencies, operating as a core subsidiary of GroupM (WPP's media investment division). Founded in 1986 and headquartered in London, MediaCom built a global footprint spanning over 100 countries, offering clients comprehensive media planning, buying, and performance optimization services across television, digital, out-of-home, print, and emerging channels. The agency was renowned for its 'Systems Thinking' philosophy, which emphasized understanding the interconnected nature of media touchpoints to drive holistic campaign outcomes for major global advertisers. At its peak, MediaCom served some of the world's most recognizable brands across automotive, FMCG, technology, and entertainment sectors, consistently ranking among the top media agencies by billings globally. Its data-driven approach, combined with deep channel expertise and GroupM's significant media buying scale, made it a formidable competitor to rivals such as Mindshare, Wavemaker, Publicis Media, and Dentsu. On January 31, 2023, WPP and GroupM merged MediaCom with Essence — a digitally-led, data-focused agency — to create EssenceMediacom. The merger was designed to combine MediaCom's traditional media strength and global scale with Essence's digital and analytics capabilities, forming a more competitive, future-facing agency. With the merger, the MediaCom brand was officially retired, and EssenceMediacom became one of the largest media agencies in the world by billings.