گرایش وضعیت بازار ، تعیین اطلاعات شرکت ، و اثر اطلاعیه بازار M & A

The paper investigates the market announcement reaction of M&A and its hidden information contents, the corresponding empirical accounting analyses are executed completely based on the M&A capital market data covering 4 year's event from 2006 to 2009 and the hidden information contents are disclosed with some logically integrations from the view of behavior finance. Some valued conclusions can be achieved listed as follows: The loss corporations are inclined to launch M&A activities significantly during bull market period whereas there is not any significant market bull or bear mark; There are significant positive market reactions especially at the first day before M&A declared, After the declared day, the market reactions are negative at once during bear market whereas they are slow to become negative during the bull market, and there isn’t any significant difference between bull market and bear market, but the significant difference is shown after M&A declared; The more perceptual features are shown in the M&A announcement effect in the pre-declared days than that of post-declared days, and the more perceptual features are also shown in the bull market than that of bear market during M&A activities. Thus some suggestions are pointed out including disclosing the corporations’ information thoroughly, enhancing the supervisors’ power strongly and cultivating the investors’ competence,etc.