The aim of this study is to analyze business growth in the Iberian Euro-region called EUROACE during the 2007-2015 period. Specifically, we analyze which type of companies are those that have the greatest growth potential and which public measures are the ones that must be taken to facilitate their development and, in this way, boost the economy of the Euro-region and create employment. To that end, we contrast a dynamic regression model using the generalized method of moments in panel data. Our results indicate that medium-sized companies are those that favor business growth and the economic development of the Euro-region regardless of the country effect.