Smaller companies are determining factors in the Chilean economy. The objective of this research is to identify and analyze key variables in the generation of competitiveness of the smallest companies in the Coquimbo Region - Chile, represented by micro, small and medium-sized companies (Mipyme). This is based on the perceptions of 384 members of the operating personnel of this type of companies and a multivariate analysis, using a structural equation model (based on covariance - MBC). It is confirmed with statistical reliability that competitiveness in smaller companies is a consequence of the influence of five constructs, which must be considered critical variables, since they positively, directly and indirectly influence the competitiveness of these companies, which are; transformational leadership, transactional leadership, performance effectiveness, extra effort, and job satisfaction. Variables that explain the variance of competitiveness by 69%.