The INSEE assigns all companies and each of their establishments, when they register with the SIRENE register, a code characterising their principal activity in reference to the French classification of activities (NAF rev. 1). More precisely, there is the APEN code for the company and the APET code for establishments.
The code (or APE) is a fundamental item of information for company statistics as it is the basis for classifying companies by sector. The quality of studies on the current and structural economic situation and the quality of the files made available to the public largely depend on the allocation of a correct APE code to each enterprise