Founded in , William Hill is one of the best-known names in the UK gambling Mr William Hill, the company's original founder, dies, having retired from the. William Hill Organization Limited retails betting and gaming machines. The company was founded in and is based in London, United Kingdom. William Hill. William Hill plc is a bookmaker based in the United Kingdom. It is listed on the London Stock The company was founded by William Hill in at a time when gambling was illegal in Britain. It changed hands many times, being acquired by History · Operations · Outside the United Kingdom · Sponsorship.