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Resumo: Neste artigo teve-se como objetivo analisar a influencia das noticias relacionadas ao mercado de capitais na determinacao da janela do evento para adesoes e migracoes aos Niveis Diferenciados de Governanca Corporativa (NDGCs) da B3 (Brasil, Bolsa, Balcao). A metodologia emprega quatro etapas: determinacao do melhor tamanho da janela para 104 empresas; analise do tamanho das janelas consideradas outliers; analise qualitativa das noticias referentes a janela do evento para os outliers, com base no Bloomberg®; e aplicacao do Estudo de Eventos para os casos considerados outliers. Os resultados encontrados indicaram uma tendencia de pequenas janelas, limitadas a 5-5 dias para cerca de 59,6% dos casos. Para os 42 casos considerados outliers, isto e, janela maior que 5-5 dias, foram encontradas noticias para 61,9%, dos quais apenas 6 casos apresentaram dummies significativas no Estudo de Eventos. A metodologia utilizada conseguiu explicar 68 casos em que houve adesao, migracao ou noticia.Palavras-chave: Governanca Corporativa. Estudo de eventos. Janelas de eventos. Noticias. Capital market news and windows of events for accessions and migrations to NDGCs Abstract: This article aims to analyze the influence of news related to the capital market in determining the window of the event for accessions and migrations to the BMF analysing the size of the Windows which are considered outliers; qualitative analysis of the news related to the window of events for outliers, based on Bloomberg®; and application of the Event Studies for the cases considered outliers. The results of the study indicated a tendency of small windows, limited to 5-5 days for about 59.6% of the cases. For the 42 cases considered outliers, i.e, window bigger than 5-5 days, news was found for 61.9%, from which just 6 ones got meaningful dummies in the Event Study. Even though, the applied methodology succeded explaining 68 of the cases in which there was accession, migration or news.Keywords: Corporate Governance. Windows of Events. Janelas de eventos. News.

Notícias do mercado de capitais e janelas de eventos para adesões e migrações aos NDGCs