Kantar is a privately held marketing data and analytics company headquartered in the UK. It was founded in 1992 and is a subsidiary of WPP plc. Kantar provides a wide range of services to its clients, including market research, consumer insights, and advertising effectiveness measurement. The company has a global presence with over 30,000 employees in more than 100 countries. Kantar's clients include some of the world's largest brands, such as Coca-Cola, Nike, and Unilever.