GroupM is a global advertising and marketing services company. The company was founded in 2003 and is a subsidiary of WPP plc. GroupM provides media investment management, data analytics, and digital marketing services to clients in more than 100 countries. The company operates through several brands, including Mindshare, MediaCom, Wavemaker, Essence, and m/SIX. GroupM's clients include some of the world's largest advertisers, such as Unilever, Procter & Gamble, and Nestlé.