Mecanismos de governança corporativa: estudo sobre o impacto na volatilidade dos papéis da BM&FBOVESPA

Abstract

In a professionalizing business environment, i.e. one in which there is a clear separation between administrators and investors, there is a great chance to occur the agency conflict, where there is always the risk that administrators act in their own interests and not in favor of maximizing the value of the company. One of the ways that this conflict is revealed in the stock market is through the risk inherent in the company’s activities, and this risk is called non-systematic risk. A measure of risk in the stock market is the volatility, and it is decreased through corporate governance mechanisms. The main purpose of this thesis is to check the impact of corporate governance mechanisms over the volatility of securities traded in the BM&F Bovespa over the period comprised between 2010 and 2015, and for such purpose data from 53 listed companies representing 81.15% of the Ibovespa index, and the model of pillars of corporate governance called Brazilian Corporate Governance Index (Brazilian CGI) were used. For the sake of good understanding of this thesis, volatility is the variation of returns over the period analyzed; panel data was used as statistical model, and the main internal mechanisms of corporate governance are based on IBGC’s four pillars, namely: (1) Accountability; (2) Transparency; (3) Corporate Responsibility and (4) Accountability. The statistical results indicated that variables related to accounting indicators and macroeconomic variables have an association with volatility reduction, and that factors directly linked to the pillars were not statistically significant.