System1 Group PLC, together with its subsidiaries, provides marketing and market research consultancy services in the United Kingdom. The company offers a range of tools, such as predictive marketing tool that uses the wisdom of the crowd to identify winning concepts; and ad-testing tool that identifies the emotional impact of advertising. It operates in the United States, Switzerland, Germany, the Netherlands, France, Brazil, Singapore, Australia, and China. System1 Group PLC was founded in 1999 and is headquartered in London, the United Kingdom.