WPP plc

World's largest advertising holding company by revenue, with dominant global media buying scale through GroupM

WPP plc is the world's largest advertising holding company, headquartered in London, UK. Founded through Martin Sorrell's acquisition of Wire and Plastic Products in 1985 and transformed into a global communications empire through decades of acquisitions, WPP today encompasses some of the most recognized agency brands in the world including Ogilvy, GroupM, VMLY&R, Wunderman Thompson, Grey, and Mindshare. The company serves a majority of the Fortune Global 500 and operates across more than 100 countries with a workforce of approximately 100,000 employees following significant restructuring efforts in recent years. WPP's core offerings span creative and brand consulting, media planning and buying, public relations, data analytics, and marketing technology. Its media investment arm, GroupM, is the world's largest media buyer, commanding significant leverage in global advertising spend across digital, TV, out-of-home, and emerging channels. WPP has made substantial investments in data and technology capabilities, including its WPP Open platform — an AI-powered marketing operating system designed to connect creative, media, and commerce workflows for clients. In the AdTech ecosystem, WPP occupies a unique position as both a buyer of advertising technology and a developer of proprietary data and AI tools. The company competes with other major holding groups such as Publicis Groupe, Omnicom, and IPG while also partnering with major platforms like Google, Meta, and Amazon. WPP's scale, global reach, and integrated service model make it a dominant force in shaping how large brands plan, create, and measure their marketing investments worldwide.