This paper aims to show that the strategic incorporation of socially responsible actions, in small and medium enterprises contribute to improving the competitiveness of those organizations. The analysis is from a multi-stakeholder perspective. It investigates the link among firms’ relationship with key stakeholders with the objective to find out if there is a competitive advantage in applying Corporate Social Responsibilities practices. Besides the direct influence of Corporate Social Responsibility practices on competitive performance, the mediating connection of relationship improvements has been analyzed. By using their influence, stakeholders hold the key to the environment in which the organization operates and its subsequent financial performance. The empirical analysis was constructed on survey data through structural equation modeling (SEM). To accomplish this assignment data were collected from a sample of Brazilian SMEs. Participants were firms from the Southern region of Brazil mainly from the State of Rio Grande do Sul, Santa Catarina, and Parana. The outcome shows that there is a strong connection between the development of Social Responsibilities practices and relational improvements. In addition, the significant relationship in developing Social Responsibilities Practices positively translates, with a high accuracy outcome into competitive performances.