衍生性商品的到期日效應一直以來受到主管機關及學界的重視，隨著金融商品不斷創新，對於台灣新掛牌的牛熊證(callable bull/bear contracts, CBBCs)到期時是否會產生到期日效應較少人探討。因此本研究利用比較期間法探討2011年7月4日至2014年12月31日在台灣證券交易所掛牌的牛熊證，研究到期時是否會產生到期日效應，亦即異常成交量、異常波動及價格反轉。本研究發現整體而言牛熊證市場異常成交量及異常波動並不顯著，僅正常到期的牛熊證價格反轉顯著。其可能原因是券商發行的牛熊證到期時，避險張數可沖銷，使得到期日與標的相同的牛熊證，價格反轉不顯著。
The expiration day effect of derivatives has been well studies by the authorities and academia. However, as far as I knew, the expiration day effect of the callable bull/bear contracts (callable bull/bear contracts, CBBCs) in Taiwan still need to be investigated. Therefore, this research employ Comparison Period Approach to examine the expiration day effect, i.e. the abnormal volume, the abnormal volatility and price reversal, of CBBCs in Taiwan. The sample period was from July 2011 to December 2014. The em-pirical results show that there are no abnormal volume or volatility in Taiwan CBBCs. Nevertheless, after the contracts with the same expiration are excluded, there is evi-dence of price reversal for both of the bull and bear contracts.
