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| Title: | 公司治理差異與內部人出脫持股方式對股價影響之實證分析
An Empirical Analysis of Stock Price’s Response to the Disclosures of Insider’s Stock Sales under Different Types of Corporate Governance |
| Authors: | 龍楷文
Lung, Kai-Wen |
| Contributors: | 張元晨
Chang, Yuan-Chen
龍楷文
Lung, Kai-Wen |
| Keywords: | 事件研究法
內部人交易
申報轉讓
延遲揭露交易
Event study
Insider trading
Declaration of transfer
Delayed disclosure |
| Date: | 2018 |
| Issue Date: | 2018-07-12 13:36:57 (UTC+8) |
| Abstract: | 本研究以事件研究法檢定台灣股市中內部人出脫持股行為對股價累積異常報酬（以下簡稱CAR）之影響，將內部人出脫持股方式分為事前申報轉讓以及事前未申報而出脫持股兩類，樣本期間為1991年1月至2017年5月。實證結果發現，在事前申報轉讓事件中，轉讓方式對CAR之影響有顯著差別，若將事前申報分為贈與類與非贈與類，可以發現贈與類的事前CAR皆不顯著異於0；非贈與類的事前CAR為顯著正值。且投資人對不同類型的申報轉讓事件有不同反應，其對於贈與類多解讀為未來股價正面的訊號；但非贈與類則抱持未來股價負面的看法。另一方面，事前未申報而出脫持股事件前後的CAR皆為顯著負值且事件日前後之CAR短時間內未有顯著差異，顯示此類型的事件隱含股價表現較差的訊號以及投資人並未因為事前未申報出脫持股事件而調整對於股價的預期。若再進一步依減少股數的多寡分類檢定後，可以發現即使是少量的未申報出脫持股，其CAR表現仍為顯著負值，顯示投資人不能因為減少股數少而忽視其對股價的影響性。最後，透過不同公司治理類型，將樣本公司依照股權控制型態分類，可以發現單一家族主導及專業經理人治理類型的公司內部人，在有事前未申報而出脫持股的行為時，其隱含股價負面的訊號比起其他類型公司更為強烈，因此投資人應特別關注這兩類控制型態公司是否有事前未申報而出脫持股的行為。
This study investigates the effects of insider trading on stock returns in Taiwan’s stock market. We separated our insider trading sample into disclosure and non-disclosure groups. Using data from Taiwan’s stock market between 1991/01/01 and 2017/05/31, our empirical results are as follows: We find different reasons of insider reported trading lead to different stock market reactions. We separate insider trading into dona-tion-between-individual versus non-donation-between-individual types and find that there are significant positive pre-CAR for donation-related trading and insignificant pre-CAR for non-donation-related trading. Furthermore, investors also take different reactions between donation-related trading and non-donation-related trading. They believe donation-related trading implied stock price will increase in the future, but will decrease if insider makes non-donation-related trading. We classify unreported trading under large or small shares decreased group by the number of shares changes. In both groups, we find there are significant negative pre-CAR and post-CAR and in-significant different between pre and post-CARs. Therefore, investors should be on alert of the impact on stock price even if the number of shares sold is small. Finally, we divide insider trading events into four categories with respect to different control types. The results show that the impact on stock price is most negative when fami-ly-own or professional manager governance enterprises’ insiders make unreported trading. Hence, investors should pay more attention to unreported tradings by fami-ly-own or professional manager governance enterprises. |
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| Description: | 碩士
國立政治大學
財務管理學系
105357023 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0105357023 |
| Data Type: | thesis |
| DOI: | 10.6814/THE.NCCU.Finance.016.2018.F07 |
| Appears in Collections: | [財務管理學系] 學位論文
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