The Thomson Corporation

The Thomson Corporation was one of the world's largest information companies. It merged with Reuters Group to form Thomson Reuters in 2008. The Thomson Corporation was active in financial services, healthcare sectors, law, science & technology research, and tax & accounting sectors. The company operated through five segments (2007 onwards): Thomson Financial, Thomson Healthcare, Thomson Legal, Thomson Scientific, and Thomson Tax & Accounting.

Until 2007, Thomson was also a major worldwide provider of higher education textbooks, academic information solutions and reference materials. On October 26, 2006, Thomson announced the proposed sale of its Thomson Learning assets. In May 2007, Thomson Learning was acquired by Apax Partners and subsequently renamed Cengage Learning in July. The Thomson Learning brand was used through the end of August, 2007.

Subsequently, on October 15, 2007, Educational Testing Service (ETS) finalized acquisition of Thomson's Prometric. Thomson sold its global network of testing centers in 135 countries, for a reported $435 million. Prometric now operates as a wholly owned subsidiary of ETS.

On May 15, 2007, The Thomson Corporation reached an agreement with Reuters to combine the two companies, a deal valued at $17.2 billion. On 17 April 2008 the new company was created under the name of Thomson Reuters. The new CEO of Thomson Reuters is Tom Glocer, the former head of Reuters, while the chairman is David Thomson, formerly of the Thomson Corporation.

Although it was officially a Canadian company and remained Canadian owned, Thomson was run from its operational headquarters in Stamford, Connecticut, in the United States.