Henry Efe Onomakpo Onomakpo
Faculty of Economics and Business, Universitas Gadjah Mada, Indonesia
Publications
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Research Article
The ESG Spectrum: Differentiated Market Reactions to Environmental, Social, and Governance Performance in the Critical Raw Materials Sector
Author(s): Henry Efe Onomakpo Onomakpo*
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, .. Read More»

