This study examines the role of Environmental, Social, and Governance (ESG) as a mediating variable in the relationship between CEO tenure and CEO education level on company value in companies listed on the IDX for the 2019–2024 period. This study uses a quantitative approach with an explanatory design and PLS-SEM analysis to test the direct and indirect effects. The results show that CEO tenure has a significant effect on company value, while CEO education level, the effect of CEO tenure on ESG, and the effect of ESG on company value are not statistically significant. Furthermore, ESG is not proven to mediate the relationship between CEO tenure and CEO education level on company value. These findings indicate that CEO leadership quality does not always automatically result in stable ESG practices and impact company value, so the ESG linkage mechanism needs further study. This study contributes to the literature by examining the relationship between CEO characteristics and firm value through the mediating mechanism of ESG in an emerging market, particularly Indonesia. The findings challenge conventional assumptions in upper echelons theory and stakeholder theory, revealing that CEO leadership quality does not automatically translate into consistent ESG practices, and that the mediating role of ESG is not supported.
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