نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
Reducing information asymmetry among investors and securities market participants is always a policy objective of regulators. Reducing the information asymmetry between investors through the creation of equal opportunities helps to increase the level of market efficiency. In this study, to verify the existence of information asymmetry in Tehran Stock Exchange, the shares with the highest market value was chosen between the years 1393-1388 and the stock returns in two, five and ten days before the public announcement of increasing profitability (more than 30%), evaluated and compared with dividend & price index (TEDPIX). Positive abnormal stock returns in this period confirmed the positive adjustment from the perspective of information asymmetry in Tehran Stock Exchange. In case of decreasing profitability the same result could not be verified. To deepen the results the P/E filter was used. The P/E filter improved the results but the improvement is not significant in the level of 95%
کلیدواژهها English
Chiang H., 2005, "An Empirical Study of Corporate Governance and Corporate Performance", Journal of American Academy of Business, No. 6(1).
O’Hara, M., 2003, "Presidental Address: Liquidity and Price Discovery", Journal of Finance, No. 58.