The present study arises in a framework where companies traded on the stock market adhere to the differentiated levels of corporative governança and the Novo Mercado established by the São Paulo Stock Exchange, with the intention of increasing the company`s value, to improve its performance, to obtain reduced costs of capital and to guarantee its sustentabilidade. The research evaluates whether Brazilian companies which adopt corporative governance practices, such as, adhesion to the Novo Mercado (maximum level of corporative governance officially established by the Brazilian stock market), create economic value for their shareholders. The Novo Mercado includes a series of principles considered best corporate governance practices. However these practices seem to be more centered in issues such as information disclosure and protection of minority shareholders, instead of issues concerning economic value creation. The metric enables a deeper analysis of the companies` capital structure, invested resources and economic results, and finally, allows an evaluation of whether the administrators` actions are, in fact, creating shareholders` value. The results suggest that the adhesion to the Novo Mercado is an important, but not a determinant factor for economic value creation in the companies of the sample.