Thomson Reuters

Thomson Reuters provides professional information, software, and AI for legal, tax, accounting, compliance, government, and media work. CoCounsel Legal connects research, drafting, document analysis, and verification for law firms and corporate legal departments, drawing on Westlaw and Practical Law content. Its tools help lawyers produce first-draft briefs and review agreements within Microsoft Word. ONESOURCE supports tax workflows for multinational corporations and large accounting firms, while Reuters supplies journalism and news.

The company formed in 2008 when Thomson Corporation and Reuters Group combined. Its predecessor businesses trace to Roy Thomson’s Canadian newspaper operations and Paul Julius Reuter’s London news service, established in 1851. Steve Hasker has served as president and CEO since 2020. Its legal AI builds on editorial infrastructure: Deep Research agents use legal classifications, KeyCite, and annotated statutes to plan and revise research. The proprietary Thomson language model extends this approach through specialized training on professional content with subject-matter experts.

CoCounsel Legal uses multiple models rather than relying exclusively on Thomson. In August 2026, the company reported that one million professionals across 107 countries and territories relied on CoCounsel. The business remains majority-owned by Woodbridge and its affiliates, which held approximately 71% of common shares as of June 2026.