Financial literacy is the ability of people to process economic information to make better financial decisions. Therefore, the financial literacy of entrepreneurs could affect the management of their companies and their results. The aim of this research is to determine if there is a significant relationship between companies’ performance and financial knowledge, financial behavior, and financial attitude of micro, small, and medium-sized entrepreneurs. The incidence of the variables age, size, and sector of the companies, as well as the entrepreneur’s age, gender, and educational level on companies’ performance, is also analyzed. Data from 206 entrepreneurs from Veracruz, Mexico, were analyzed using a logistic regression model. The results show that the financial behavior of the entrepreneurs has a positive and highly significant effect on companies’ performance, although the entrepreneur´s knowledge and attitude don´t have a significant relationship with companies´ performance. The results also show that companies in the industrial sector led by men are less likely to obtain high performance compared to those in the commerce sector. No incidence was found of the variables age, size of the company, and entrepreneur´s educational level on the performance of their companies.