Traditionally, volume has provided the link between trading activity and returns. This study attempts to not only investigate the trading behavior of all aspects of investors by daily order imbalances, the better index than dollar volume, around firm-specific news releases, but also explore the relation between order imbalances and daily returns. This study contributes to the shot-run market reactions and trading behaviours from different three or five kinds of investors around seasoned equity offerings announcement in Taiwan. We have examined 306 SEOs listed on Taiwan stock exchanges from 1995 to 1998, and test five subsequent SEO-related signaling dates, such as the shareholders’ conventions date, the formal announcement date, the ex-right date and the listed date. Our findings indicated the anomalies on returns and order imbalance did exist with the publication of SEO news in Taiwan. The negative information effect is significant on the shareholders’ convention date. Further we find a strong relation between order imbalance from individuals and daily return in the five day window. We infer that individual investors are extreme sensitivity to any news released and that the majority of traders in TSE are comprised by individual can explain the phenomenon. Finally, we also find not only correlation among different type of traders but also that returns, cash per share and the interest rate influence trading decision deeply. / Traditionally, volume has provided the link between trading activity and returns. This study attempts to not only investigate the trading behavior of all aspects of investors by daily order imbalances, the better index than dollar volume, around firm-specific news releases, but also explore the relation between order imbalances and daily returns. This study contributes to the shot-run market reactions and trading behaviours from different three or five kinds of investors around seasoned equity offerings announcement in Taiwan. We have examined 306 SEOs listed on Taiwan stock exchanges from 1995 to 1998, and test five subsequent SEO-related signaling dates, such as the shareholders’ conventions date, the formal announcement date, the ex-right date and the listed date. Our findings indicated the anomalies on returns and order imbalance did exist with the publication of SEO news in Taiwan. The negative information effect is significant on the shareholders’ convention date. Further we find a strong relation between order imbalance from individuals and daily return in the five day window. We infer that individual investors are extreme sensitivity to any news released and that the majority of traders in TSE are comprised by individual can explain the phenomenon. Finally, we also find not only correlation among different type of traders but also that returns, cash per share and the interest rate influence trading decision deeply.

公司分割制度在歐美各國已行之有年，對於企業而言分割已是進行企業重組再造的普遍管理工具，惟我國完成分割法制不過三年左右光景，因此對於我國公司分割事件與股東價值關聯性之相關研究仍付之闕如。 因此，本研究以國內上市公司為樣本，以民國91年2月企業併購法公告施行後至94年1月底為研究期間，探討上市公司分割行為、公司分割宣告對股價異常報酬率的影響及影響股價異常報酬率的關聯性。 本研究主要發現如下： 1.本研究針對公司分割進行實際案例探討，發現公司之分割活動使其財務報表之資產結構改變，資產內容重新分配，顯示分割行為對公司資產負債表會產生立即性的影響。我國上市公司從事分割行為後較分割前之每股淨值平均增加0.76元，其增加的比率約6.63%；從分割公司之淨值負債比來看，我國從事分割之上市公司因分割行為使公司之平均淨值負債比增加59.23%，其增加的比率為52.23%。 2.在公司分割宣告日，被分割公司股價具有正向的異常報酬及累積異常報酬。 3.公司分割移轉之每股土地增值稅準備金額對股價標準化異常報酬率有顯著之正向影響。 4.「業務型分割」型態相對於「不動產型分割」而言，市場給予較高的異常報酬率。