ESA follows the European Commission’s definition of an SME. Please refer to the definition in the recommendation 2003/361/EC of the European Commission (http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32003H0361&from=EN) and the EC summary page (https://ec.europa.eu/growth/smes/sme-definition_en).
Please note that some conditions apply for holdings.