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研究生： 牟慧倢
Huei-Chieh Mou
論文名稱： S&P 500指數成分股調整之股價與經營績效
Stock and Operating Perofrmance of Additions in S&P 500 Index
指導教授： 徐政義
Cheng-Yi Shiu
口試委員:
學位類別： 碩士
Master
系所名稱： 管理學院 - 財務金融學系
Department of Finance
畢業學年度： 99
語文別： 英文
論文頁數： 24
中文關鍵詞： S&P 500指數 、成份股 、價格壓力 、訊息內涵
外文關鍵詞： S&P 500 Index, Additions, Price pressure, Information content
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    • 本文主要研究標準普爾500指數(S&P 500 Index)新增股的股價反應及經營績效的變化，以探討指數調整是否為一蘊含資訊事件。研究發現指數的新增股在短期有正的異常報酬但在執行日後迅速反轉，長期並沒有顯著的異常報酬。新增股的經營績效在被納入的前一年顯著高於同業，但加入成分股後之績效區卻低於同產業公司。實證結果符合價格壓力假說，且經營績效並未因此改善，從而驗證指數調整並非為一蘊含資訊事件。

    This study investigates the price reaction and operating performance of the added stocks in the S&P 500 index from January 2000 to October 2009 in S&P 500 index. Empirical results show that short-run abnormal return is significantly positive but reverse soon after the effective day. Long-run abnormal return does not exist. The operating performance of additions significantly outperforms their benchmarks one year before the adjustment but becomes worse afterwards. The positive price reaction is not permanent and the operating performance is not significantly improved. It infers that the index inclusion is an information-free event.

    List of Tables vi List of Fugures vi 1.Introduction 1 2.Literature Review 2 2.1 Downward sloping hypothesis 2 2.2 Price pressure hypothesis 4 2.3 Investor awareness hypothesis 5 2.4 Information hypothesis 5 3.Introduction of S&P 500 Index 6 4.Sample and Methodology 8 4.1Sample 8 4.2Methodology 9 5.Results 12 5.1 Stock performance 12 5.2 Operating Performance 14 6.Summary and Conclusions 15 Reference 16

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