WPP plc is a British multinational advertising and public relations company with its main management office in London, England, and its executive office in Dublin, Ireland. It is the world's largest advertising company by revenues, and employs around 162,000 people in 3,000 offices across 110 countries. It owns a number of advertising, public relations and market research networks, including Millward Brown, Grey, Burson-Marsteller, Hill & Knowlton, JWT, Ogilvy & Mather, TNS, Young & Rubicam and Cohn & Wolfe.

Official website: www.wpp.com