本研究以35家國內銀行為對象，期間自2005年到2013年非平衡的追蹤資料(panel data)進行回歸分析。迴歸結果顯示，銀行規模、自有資本比率及經濟狀況與銀行的經營績效有顯著的正向關係；而與逾期放款比率(NPLR)有顯著的負向相關，顯示銀行的資產規模愈大、自有資產比率(淨值比率)愈高、總體的經濟情況愈好，則銀行的經營績效就愈好，逾期放款比率就愈低。其次，證據也顯示，銀行大股東持股比例、董監事持股比例及董監事持股質押比例，均與經營績效呈現顯著負相關，代表當大股東持股比例、董監事持股比例及董監事持股質押比例增加，則銀行經營績效顯著愈差，此實證結果支持利益掠奪假說(Entrenchment Hypothesis)，即董監事持股比例愈高，代理問題愈嚴重。最後，本研究亦發現，公營銀行的逾放比率顯著較高，顯示公營銀行的管理階層可能有較高的代理問題。

This study used 35 domestic banks unbalanced panel data of 2005-2013 to investigate the relevance of ownership structure and performance. The regression results show the size of the bank, equity ratio and economic conditions toward operating performance have a significant positive correlation and toward non-performing loan ratio (NPLR) have a significant negative relationship. Furthermore, this evidence also verified that the proportion of the largest shareholder, directors and supervisors holding ratio and equity pledge ratio of directors and supervisors toward operating performance are significant negative correlation. This representative the higher of directors and supervisors shareholding ratio and the directors and supervisors shareholding pledge ratio, the bank's operating performance is worse. The empirical results support entrenchment hypothesis. That is, the higher the proportion of shareholding of directors and supervisors, the more serious the agency problem. However, this study has not found statistically significant relation between ownership structure and NPLR. Finally, the results also indicate that the government-owned banks have a significant higher non-performing loan ratio (NPLR). It implies that public bank's management may have a higher agency problem.

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