The ESG Spectrum: Differentiated Market Reactions to Environmental, Social, and Governance Performance in the Critical Raw Materials Sector

This study investigates the financial impact of Environmental, Social, and Governance (ESG) performance in the global Critical Raw Materials (CRM) sector. Using a sample of 25 publicly listed CRM firms from 2018 to 2024, companies were segmented into "Laggard," "Improver," and "Leader" portfolios based on ESG risk ratings. A multi-method framework was applied, combining multivariate panel regressions, time-series models (GARCH, VAR), and machine learning (LASSO) to disentangle the financial effects of the E, S, and G dimensions. The research challenges the monolithic view of ESG performance by testing for non-linear, portfolio-dependent relationships between sustainability indicators and stock returns in a strategically vital industry. Results reveal a significant “ESG tug-of-war” among Improver firms: while markets reward social performance, they appear to penalize environmental and governance initiatives, likely due to transition-related costs. In contrast, ESG impacts for Laggard and Leader firms are statistically insignificant, suggesting either market indifference or fully priced-in performance. These findings offer a nuanced framework for understanding the conditional financial materiality of ESG. They have direct implications for investment strategies, sustainability reporting, and policy formulation in resource-intensive sectors navigating the energy transition.