The present study investigates to what extent CEO overconfidence could moderate the CSR and financial performance binding relationship, concerning a sample of American and European banks, regarding the period spanning from 2013 to 2021. Using simultaneous quantile regression analysis, the empirical results indicate that engaging in socially responsible activities might negatively impact banking financial performance at high financial performance levels. Moreover, CEO overconfidence appeared to positively affect financial performance at all quantile levels. Additionally, CEO overconfidence was liable to exert a rather significant influence on the CSR of banks displaying FP scores approaching the highest performance levels. The findings also highlighted that overconfidence positively moderates the CSR effect on banking financial performance at all quantile levels. This research provides practical implications and insights for managers and policymakers seeking to improve banks' financial performance through highlighting the joint effect of strong commitment to CSR practices and CEO overconfidence.