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Chasing ESG performance: How methodologies shape outcomes
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DOI：10.1016/j.irfa.2025.104239.png)
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Abstract
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ESG metrics play a crucial role in sustainable finance but face growing criticism for their inability to accurately capture actual sustainability improvements. This study investigates how methodological choices can introduce distortions in ESG scores, with a primary focus on Refinitiv ESG data, while offering insights applicable to other providers as well. We show that data aggregation and score normalization through percentile ranking significantly impact the ability to reflect genuine sustainability progress. Specifically, the inclusion of new, smaller in size entrants with more missing data can artificially inflate the scores of top-ranked companies, obscuring actual sustainability improvements in the underlying metrics by relying on peer comparisons. Moreover, our analysis reveals that once companies achieve an A-rating category, they are unlikely to be downgraded, further highlighting the impact of these methodological decisions on the dynamics of ESG scoring. Overall, our analysis of three key sectors from 2012 to 2021 reveals that less than 45% of total absolute score variation is attributable to company disclosures, emphasizing the influence of score construction methodologies. We show that replacing percentile ranking with a simpler Performance Ratio methodology could mitigate these issues, offering more representative scores.
Keywords:
ESG score
ESG rating methodology
Refinitiv
Normalization
Missingness
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