WPP plc is a British multinational communications, advertising, public relations, technology, and commerce holding company headquartered in London, England. It is the world's largest advertising company, as of 2023. WPP plc owns many companies, which include advertising, public relations, media, and market research networks such as AKQA, Burson, Hogarth, Landor, Ogilvy, VML, and WPP Media. It is one of the "Big Three" agency companies, alongside Publicis and Omnicom. WPP has a primary listing on the London Stock Exchange, and is a constituent of the FTSE 250 Index. Wikipedia