| Summary: | 碩士 === 大葉大學 === 管理學院碩士在職專班 === 106 === Taiwan Stock Exchange（TWSE）, as a sample in this study, has launched trading operations since 1962 and investors expect to accelerate trading profits by positive and negative spreads. Whether shareholders determine to participate in rights offerings is on the basis of the potential of investment targets involving the rate of return.
The study makes use of event studies to classify the characteristics of listed companies and over-the-counterstocks in TWSE from 2000 to 2016 and identifies, through the BCG matrix analysis defining companies in TWSE, four attributes which considerably refer to stock returns:
1.With ex-rights and ex-dividend, there are significant positive effects on stock prices presented in TWSE.
2.On ex-rightsor ex-dividend dates, positive abnormal returns are significantly achieved for four quadrants designated in the BCG matrix.
3.The cumulative abnormal returns in the categories of stars and question marks are superior than dogs and cash cows.
4.The variation in stock returns is associated with operation policy, market share, and market growth ratelocated in each company in TWSE.
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