The incorporation and development of small and medium-sized companies has been a constant concern in recent years in business development. The different national governments have opted for legal solutions that facilitate the creation of companies and their operation during the first years. In this book we present the Spanish and Mexican cases. In the former, a new type of company was adopted in 2003: the Sociedad Limitada Nueva Empresa. New companies were set up mainly through the use of telematic means. Various facilities were granted to new entrepreneurs. Mexico adopted a new type of company in 2016: the Simplified Joint Stock Company (Sociedad por Acciones Simplificada). It is a type of company that brings small and medium-sized entrepreneurs closer to the advantages of the corporation, but with an almost entirely electronic incorporation and operation process.