There is a growing trend of seeking to move toward sustainable development and because of this, together with the increasingly watchful eye of society, companies are increasingly taking note of this new niche in the stock market. Thus, fund managers and investors see a need to align profits with environmental, social and economic variables in business management as well as corporate governance. The Brazilian Corporate Sustainability Index (Índice de Sustentabilidade Empresarial—ISE) was created in 2005 by the São Paulo Stock Exchange, currently known as B3, which is the result of the merger between the BM&FBovespa and CETIP, and has this nomenclature in reference to the initial letters of Brasil, Bolsa, Balcão. The ISE aims to identify a company's commitment to sustainability and thereby guide the capital and credit market, highlighting companies that incorporate social and environmental risks into the organization, seeking to positively influence the image of the companies involved. The aim of this research was to verify the superior economic and financial performance of the Brazilian companies that are included in the ISE portfolio in relation to the other companies that constitute the Ibovespa, between the years of 2014 and 2018. As a result, a neutral relationship between financial performance and sustainable development was identified, which is consistent with the results of previous studies referenced and addressed in this research. The findings of this study provide an important contribution to the existing research on sustainability in financial markets, since few scientific articles that investigate, using indicators and statistical treatment, the Brazilian sustainability market, are available.