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Stock market reactions to a sovereign wealth fund's broad-based public sustainability engagement: European evidence

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  • Habermann, Florian
  • Steindl, Tobias

Abstract

This study examines investor reactions to a broad-based public engagement by the world's largest sovereign wealth fund (SWF). We use the SWF's announcement to vote against firms with insufficient sustainability performance in an event study comprising 1,169 portfolio firms headquartered in Europe. The results show an average negative reaction of USD 39.99 million to the announcement. The negative effect is concentrated in portfolio firms with low sustainability performance measured by Refinitiv's environmental, social, and governance (ESG) score. Focusing on the SWF's voting share, we find that firms with low sustainability performance and a high voting share experience the most negative market reaction. Notably, the moderating effect of ESG score uncertainty becomes apparent, as firms with both low sustainability performance and low ESG score uncertainty experience more pronounced negative stock market reactions. In contrast, firms with low performance and high uncertainty show no statistically significant effect. Several robustness tests—including a regression discontinuity in time design—confirm our results. Overall, our findings reveal that broad-based public sustainability engagement can exert pressure on European portfolio firms, suggesting that this form of indirect engagement complements direct engagement strategies in their objective to enhance firms’ sustainability performance. Our findings have valuable implications for researchers, practitioners, and policymakers interested in understanding the evolving landscape of investor-firm interactions.

Suggested Citation

  • Habermann, Florian & Steindl, Tobias, 2025. "Stock market reactions to a sovereign wealth fund's broad-based public sustainability engagement: European evidence," Journal of Economic Behavior & Organization, Elsevier, vol. 231(C).
    • Handle: RePEc:eee:jeborg:v:231:y:2025:i:c:s0167268125000356
    DOI: 10.1016/j.jebo.2025.106915
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