This study aims to examine the effect of ESG on firm value and the moderating role of audit quality in the ASEAN context. Using a sample of public listed companies from 2016 to 2024, data were analyzed using panel data regression. The results indicate that ESG disclosure has a significant positive effect on firm value, suggesting that sustainability transparency serves as a credible signal to investors. Furthermore, audit quality is found to positively moderate this relationship, acting as a signal enhancer and mitigates greenwashing concerns. This research contributes to signalling theory by demonstrating how audit effort reinforces the credibility in emerging markets.
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