| Summary: | 碩士 === 國立政治大學 === 財務管理研究所 === 96 === In this paper, we use event-study to estimate the stock price changes of Food and Drug Administration (FDA) decisions on new products for pharmaceutical companies. We find that FDA decisions have insignificant effects in all countries on the drug approval date. The insignificant price changes accompanying FDA announcements approval suggest that drug results have leaked to the market. It is quite possible that the results of advisory are open to public and advisory committee are held before FDA approval, advisory committee can be viewed as important news source of drug approval. After the drug approved by the FDA, the new drugs may bring additional income to the companies. Although the accounting data are insignificant at five percent significant level, we still can peek that the companies with new approval drug have their EPS increase. Besides, 41% of analyst rates the performance of next quarter better than actual EPS at that time. The reason can be the access of undisclosed information about successful approval of new drugs.
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