Previous studies suggest that managerial beliefs such as overconfidence and optimism help to explain variation in pecking-order behavior. Nevertheless, due to a limitation on the sustainability of the measure of optimism, the difference between optimism and overconfidence, and the cross-nation variation in overconfidence, we believe an additional test for CEO overconfidence in Taiwan is necessary. This paper uses employee stock options to measure the level of CEO overconfidence in Taiwanese electronics companies and tests the relationship between overconfidence and corporate external financing decisions. We find that, conditional on accessing external funds, overconfident CEOs issue more debt than non-overconfident ones, confirming the importance of managerial beliefs in explaining hierarchical financing.