Mediacom

Was one of the top 3 global media agency networks by billings 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 specialized in media planning, buying, and performance optimization across all channels — including TV, digital, out-of-home, and emerging media. The agency was known for its 'Systems Thinking' philosophy, which emphasized understanding the interconnected nature of media touchpoints to drive holistic campaign performance for major global advertisers. At its peak, MediaCom operated in over 100 countries and managed billions of dollars in media billings annually, serving some of the world's most recognizable brands across sectors including automotive, FMCG, technology, and entertainment. The agency consistently ranked among the top global media networks by billings and was recognized by industry bodies for its strategic planning capabilities and data-driven approach to media investment. On January 31, 2023, MediaCom merged with Essence — another GroupM agency known for its digital and data expertise — to form EssenceMediacom. The merger was designed to combine MediaCom's scale and traditional media strength with Essence's digital-first, analytics-driven capabilities. Following the merger, the MediaCom brand was retired, and EssenceMediacom now operates as one of the largest media agencies in the world under the GroupM umbrella.

• 1986Founded
• 2023Rebranded to EssenceMediacom