System1 Group

System1 Group plc is a market research firm specializing in advertising effectiveness. Publicly quoted on the London Stock Exchange's AIM market under the ticker SYS1, the company was founded around 1999 as BrainJuicer Group plc before rebranding to System1 in the mid-2010s.

The company focuses on emotion-based advertising and brand testing, utilizing products such as Test Your Ad to predict marketing effectiveness based on emotional responses rather than stated opinions. It is characterized as a small-cap business with a cash-rich balance sheet and a history of paying dividends.