If your company operates in multiple industries, choose its primary industry (available in company profiles).
The sources listed here don't cover ALL industries. Although most of the sources are based on either SIC or NAICS, not every SIC or NAICS code is included. Information is more readily available for broader categories. Industries with little revenue might be left out, and very specific industries might not be included. If you can't find the code you are looking for, use a difference source that includes the code or choose a different (or broader) industry.