This article scrutinizes the leader’s emotional intelligence effect on the enterprises’ performance (diversification is the main strategy). After the theoretical discussion which approaches our subject matter, we propose our research assumptions. Thus, this research attempts to answer our central question: How can emotional intelligence affect the performance of Tunisian enterprises (diversifiable companies)? Our methodology consists of two parts. The first is used to identify the data sample selection and the second is devoted to the results interpretation. The main contribution of this work is to explain how the behavioral finance (we speak about emotional intelligence) allows to present answers regarding performance of companies (which the strategy the adopted is the diversification). The results obtained from the linear regressions made on a sample of the show well the significant and positive CEO emotional intelligent on the financial, social and environmental performance.