High Quality Content by WIKIPEDIA articles! The Thomson Reuters Business Classification (TRBC) is an industry classification of global companies; it is owned and operated by Thomson Reuters and is also the basis for Thomson Reuters Indices.TRBC covers over 70,000 public companies from 130 countries and provides over 10 years of classification history. The classification consists of four levels of hierarchical structure. Each company is allocated an Industry, which falls under an Industry group, then Business Sector, which is then part of an overall Economic Sector. TRBC consists of 10 Economic Sectors, 25 Business Sectors, 52 Industry Groups and 124 Industries.