Definitions of explanatory variables.

This paper explores the impact of the CEO’s supervisory role as an independent director on firm performance, utilizing measures such as Return on Equity (ROE) and Tobin’s Q. The supervisory effect is assessed through the remuneration of directors and supervisors. Empirical findings indicate a significant supervisory role when the CEO also serves as an independent director. Whether viewed from the perspective of shareholders’ equity or company growth, the CEO’s involvement as an independent director positively influences firm performance. Furthermore, the concurrent roles of CEO and independent director contribute to enhanced firm performance, irrespective of their relationship.