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 powerhouse through decades of acquisitions, WPP today encompasses some of the most iconic agency brands in the world, including Ogilvy, GroupM, VMLY&R, Wunderman Thompson, Grey, and Hogarth. The company serves clients across more than 100 countries, offering an integrated suite of services spanning creative, media planning and buying, public relations, data analytics, and marketing technology. WPP's significance in the AdTech ecosystem is profound. Its media investment arm, GroupM, is the world's largest media buying organization, controlling an estimated 30%+ of global media spend. The company has made substantial investments in data and technology capabilities, including its proprietary marketing intelligence platform WPP Open, which leverages AI and first-party data to help clients navigate a cookieless future. WPP has also forged deep partnerships with major technology platforms including Google, Meta, Amazon, and Salesforce, positioning itself as a critical intermediary between global advertisers and the digital media landscape. In recent years, WPP has undergone significant restructuring under CEO Mark Read, consolidating agency brands (merging JWT with Wunderman to form Wunderman Thompson, and VMLY&R with Wunderman Thompson to form VML), divesting non-core assets, and doubling down on AI-driven creativity and marketing technology. With annual revenues exceeding £14 billion, WPP remains the dominant force in global advertising, competing directly with Publicis Groupe, Omnicom, Interpublic Group, and Dentsu.