本文研究主要在探討以銀行團聯貸宣告下，對台灣地區上市的參貸銀行和借款公司之股東財富有何影響？本研究以事件研究法（Event Study）對標準化異常報酬做檢定，同時由於過去對殘差項估計多是以古典最小平方法來估計，但是實際股票報酬率通常具有尖峰態的胖尾分配，因此本文同時採Bollerslev(1986)的GARCH估計法及傳統古典最小平方法估計，並對結果做一比較；實証結果如下：

本研究得到下列結論：

1、在股價報酬時間數列特性上：對放款銀行之股價報酬而言，呈現異質變異性質者佔近四成，而對借款公司之股價報酬而言，呈現異質變異性質者佔四成，因此在考慮報酬率的特性時需將此考慮各國模型中，但就事件觀察期的顯著性而言，以古典最小平方法估計以異質條件變異數分析法估計的結論上，無論在放款銀行或在借款公司上皆無顯著之差異，可能因為時間數列的時間較短所致。

2、就放款銀行而言，銀行團聯貸之宣告日前一天，即有整個事件期中最強烈的正向反應，但未達顯著水準，而在宣告日前一天至宣告日當天的事件窗口有顯著水準的正向反應，顯示銀行團聯貸宣告所傳達給放款銀行之股東是正面資訊內涵。

3、就借款公司而言，銀行團聯貸之宣告前二天即有強烈的正向反應（但未達顯著水準），但隔天（宣告日前一天）即以整個事件期中最強烈的負向反應（但未達顯著水準）逆轉，而在宣告日前一天至宣告日當天的事件窗口卻有顯著水準的負向反應，顯示銀行團聯貸宣告所傳達給借款公司之股東是負面的資訊內涵。

4、放款銀行在累積異常報酬方面，在宣告日前十八天左右即有資訊揭露的現象，但持續4天之後，隨即有下跌趨勢，至宣告日前二天更跌至谷底，最後在宣告日後二天才轉回來，此現象可能代表投資人對銀行團聯貸之推動，時間拖愈久，對聯貸之成功與否持較悲觀的市場反應，乃至聯貸宣告後二天，才明確的正向反應出來。

5、借款公司在累積異常報酬方面，在宣告日之前即有上漲的趨勢，此現象顯示借款公司之股東對借款公司持較樂觀的市場反應，然宣告日前一天負面反應最強烈，可能顯示聯貸案成功與否會響到借款公司聲譽及資金的調度等方面，但聯貸案成功宣告後，則以更大幅度的正向股價反價，因此聯貸宣告整體而言，對借款公司之股東應為正面的資訊內涵。

6、以橫斷面分析法複迴歸的方式分別探討對放款銀行與對借款公司之異常報酬影響原因，實証結果顯示在放款銀行而言有99..........9%以上的顯著性，表示異常報酬與新銀行是否加入競爭有負向的關係，此現象表示81年新銀行的成立，使得舊有銀行聯貸的利潤受到很大衝擊。而在借款公司而言，銀行團參貸家數，與借款公司之異常報酬無顯著相關性，無法証實「契約彈性假說」，而借款公司之資產規模與舉債能力與異常報酬無顯著水準相關。

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