Standard Industrial Classification Law and Legal Definition

Standard Industrial Classification (SIC) is a U.S. federally designed system, which identifies companies by industry with a standard numbering system. It provides other information and is used by securities analysts, market researchers, and others.

The Standard Industrial Classification has been replaced by the new North American Industry Classification System (NAICS), but several data sets are still available with SIC-based data. Both SIC and NAICS classify establishments by their primary type of activity.