Reuters Group plc was a British multinational media and financial information company headquartered in London, United Kingdom. It was acquired by the Thomson Corporation in 2008, forming Thomson Reuters, and moved its head office to Toronto.

The Thomson Corporation was one of the world's largest information companies. It was established in 1989 following a merger between International Thomson Organization and Thomson Newspapers. In 2008, it purchased Reuters Group to form Thomson Reuters. The Thomson Corporation was active in financial services, healthcare sectors, law, science and technology research, as well as tax and accounting sectors. The company operated through five segments : Thomson Financial, Thomson Healthcare, Thomson Legal, Thomson Scientific and Thomson Tax & Accounting.