The Role of Investor Demographics in Moderating the Effect of ESG Risk Ratings on Stock Price Synchronicity Among Companies Listed on the Idx80 Index of The Indonesian Stock Exchange

ESG Risk Rating Stock Price Synchronicity Investor Demographics Green Industry Brown Industry IDX80

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August 21, 2026

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This research aims to analyze the effect of ESG Risk Rating on stock price synchronicity as a proxy for stock price informativeness among firms listed in the IDX80 Index of the Indonesia Stock Exchange during 2021–2025. The research also examines the role of stock price synchronicity as an information mechanism in stock price formation and the role of investor demographics as a moderating variable in the relationship. In addition, this study considers the differences between green industry and brown industry characteristics in market responses to ESG information. Using panel data regression, this quantitative study analyzes IDX80 companies with Morningstar Sustainalytics ESG ratings. It examines ESG Risk Ratings, stock prices, stock price synchronicity (logit-transformed adjusted R2), investor demographics, industry types, and macroeconomic controls. The findings reveal that ESG Risk Ratings do not significantly affect stock price synchronicity, suggesting that ESG information is not yet fully internalized within the price formation mechanism of the Indonesian capital market. While investor demographics moderate this relationship, the effect is not consistently significant. Instead, industry characteristics, firm size, and macroeconomic factors exert a more dominant influence on synchronicity. By highlighting how non-financial information transmits through price synchronicity, this study provides valuable insights for investors, firms, and regulators regarding market efficiency and behavioral dynamics in an emerging market.