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This study uses the event study methodology to investigate the abnormal returns of Apple Inc.’s suppliers in Taiwan, and it reviews the variables influence on abnormal returns. The event dates are the new product introduction of the Apple Inc. iPhone 5 from 2012. The object of this study is the Taiwanese electronics industry, and the events are the product introduction of the new iPhone 5 product in 2012. Stock return data from 2012 to 2013 was used. Sample companies were selected by analyst reports, and the suppliers were screened by public announcement. Finally a total of 119 companies were selected in this study from among the Apple Inc.’s suppliers. Empirical results support the new product introduction effect, there are early responders to the phenomenon. In addition, there are negative reactions in the tendency of over-correction after the day of introduction. The overall conclusion will suggest investors to invest in related companies with new product announcement. And investors should arrange companies with new product introduction. It will have the optimum when invest in semiconductor firms which supply electronic components are considered with Earnings Per Share.
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