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Recent studies have indicated that the alerted securities had announcement effects. The investors who take the alerted announcement of the abnormal trading as investment strategy, earn significantly abnormal return in a short period. This paper examines weather the alerted announcement of the abnormal trading has announcement effect, and tries to identify the determinates of the abnormal return using event study methodology and multiple regression, this paper exams the alerted securities of Taiwan during January 1996 to 2001 and test weather the abnormal return may be effected by stock capital, market value, earnings per share (EPS), ME/BE, land and house revaluation increments, industry categories and the day-of-the-week. The empirical results are: 1、For whole sample, the period betwwn five days before and the day of the announcement exhibit significantly and positive abnormal return. 2、After announcement,whole sample of the alerted securities have been reevaluated by the market and reflect the content of the information instantly. This causes abnormal return reforms and stock prices adjust back to the rational condition. 3、Except for the variable of land revaluation increments, all factors show significant explanation power.
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