O impacto de notícias públicas no retorno de empresas pertencentes ao índice de sustentabilidade empresarial

Abstract

The subject of this survey is to verify whether the positive and negative news in regards of sustainability, released by Valor Economico vehicle of communication in the period of January 1st, 2010 to June 30th, 2016, had greater negative or positive impact to the companies pertaining to the “Índice de Sustentabilidade Empresarial (ISE)”, Business Sustaining Rate, or not belonging to the “Índice de Sustentabilidade (Não ISE)” sustaining rate (non ISE).In total, 66 companies were analyzed, taking as a basis the market model. Afterwards, the average of accumulated abnormal returns were tested to verify if it is significantly different to zero. The focal point was the event date (0,0) and, from this date on, it was evaluated the windows (-22,0), (-15,0), (-10,0),(-5,0), (-4,0), (-3,0), (-2,0), (-1,0), (0,0), (0,+1), (0,+2), (0,+3), (0,+4), (0,+5), (0,+10), (0,+15) and (0,+22). Supposing the connection between the companies members to ISE, a more expressive impact due to the own guidelines and requirements to the rate’s insertion, an event survey was made aiming to verify the presence of statistically significant abnormal returns around and in the news’ announcement date. The results of the analysis indicate the existence of an expressive negative abnormal return before the event, and non-significant abnormal return after the event and absence of abnormal returns around the event, proposing effect previous to the dated of announcement, which suggests privileged or considered information.