本研究以1989 至1999 年間,291 家初次在台灣證券交易所公開發行之普通股股票為研究樣本,利用各種衡量模式再次探討其上市後短期與長期之報酬績效。發現股票上市之初具有正的異常投資績效,且發現這短期異常報酬逐年下滑。但是,在短期異常現象結束之後,並沒有出現異常的長期績效。這些證據支持短期異常報酬是由於新上市股票承銷價格被低估所致。
This study applies various measurement models to reinvestigate the short-run and long-run performance of 291 initial public offerings (IPOs) of common stock on Taiwan Stock Exchange for the period from 1989 to 1999. I find positive abnormal stock performance subsequent to listing and find these short-run abnormal returns to drop year by year. But, after at end of this short-run abnormal phenomenon, there is not abnormal long-run performance. This evidence supports that the short-run abnormal returns are due to underpricing of IPOs.