O impacto das normas IFRS no valor de mercado das empresas do setor de energia elétrica negociadas na BM&FBovespa: um estudo de evento

• Autor(a) principal: Martins, Andressa Iovine
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_SP
• Texto Completo: https://tede2.pucsp.br/handle/handle/1515
• topic: (IFRS); Energia elétrica; Estudo de evento; Demonstrações financeiras; International Financial Reporting Standards (IFRS); Electric energy; Event study; Financial statements; CNPQ::CIENCIAS SOCIAIS APLICADAS::ADMINISTRACAO::CIENCIAS CONTABEIS

This study has two main objectives: to determine whether the disclosure of annual financial and accounting statements of companies in the electric energy sector, in the period under review, caused abnormal returns in relation to stocks included in the sample in question, as well as to assess whether the disclosure in the International Financial Reporting Standards (IFRS-GAAP), from 2009 on, caused more meaningful and more statistically relevant returns than the earning announcements carried out in the Brazilian standards (BR-GAAP). In order to accomplish that, an event study based on the methodology of Mackinlay (1997) was conducted, in which the studied event was the publication of the accounting and financial statements of 13 companies in the electrical energy sector throughout the period from 2007 to 2011, amounting to 65 events which were part of the initial sample. The final studied sample, after deleting events not eligible for analysis, resulted in 62 events, which were also segregated by year 2007-2008 (BR-GAAP); 2009-2011 (IFRS-GAAP) and, later, by portfolio of "Good News" and "Bad News" within the periods considered in relation to BR-GAAP and IFRS-GAAP. The results indicated that the earning announcements of the companies in the electric energy sector, throughout the period from 2007 to 2011, generated abnormal returns around the date of the event in relation to stocks of the sample. With regard to the segregation by portfolios of "Good News" and "Bad News", only the first led to an early reaction of the market and with statistical significance. Finally, unlike what was expected, it was not possible to affirm that the abnormal returns of the IFRS-GAAP sample were greater than the BRGAAP sample, but on the contrary, the BR GAAP sample returns, around the date of the event, were higher and with greater statistical relevance than the IFRS-GAAP samples