Impact of ESG Reporting on Bank Performance: An International Panel Study

Thesis Abstract

This study investigates how Environmental, Social, and Governance (ESG) reporting influences bank performance across major developed and emerging markets, addressing the persistent ambiguity about the mechanisms through which ESG transparency affects financial and risk-adjusted outcomes in the banking sector. The problem stems from inconsistent empirical findings and limited cross-country evidence on whether ESG disclosures translate into tangible performance benefits or prudent risk management, particularly in relation to capital efficiency, credit risk, and cost of capital. The aim is to quantify the impact of ESG reporting quality on bank performance and to unpack the channels through which ESG information affects stakeholder perceptions, financing costs, and risk management in an international context. Specific objectives are (i) to measure the association between ESG disclosure quality and bank profitability, risk-adjusted performance, and market valuation; (ii) to examine the moderating roles of regulatory stringency and institutional quality; (iii) to assess whether the relationship varies by bank size, ownership structure, and region; and (iv) to identify potential transmission channels, including funding costs, lending standards, and non-performing loan dynamics. The study adopts a longitudinal panel design covering 1200 bank-year observations from 60 banks in 12 countries over the period 2012–2023, ensuring representation from both advanced economies and emerging markets. Data on ESG reporting quality are drawn from standardized ESG disclosure scores compiled by multidisciplinary rating agencies and cross-validated with bank sustainability reports. Financial performance is proxied by return on assets (ROA), return on equity (ROE), and risk-adjusted performance measures such as the Sharpe ratio and the systemic risk-adjusted Merton distance-to-default. Market-based performance is captured via Tobin’s Q and stock return sensitivity to ESG announcements. Explanatory variables include ESG disclosure quality, governance practices, and environmental and social risk management disclosures. Control variables consist of bank size, leverage, liquidity, capital adequacy, operant profitability, macroeconomic indicators, and country-level regulatory indices. Methodologically, the study employs fixed-effects and system GMM panel estimators to address potential endogeneity between ESG reporting and bank performance, supplemented by instrumental variable approaches where appropriate. A mediation analysis using structural equation modeling (SEM) will test proposed channels (i) cost of debt and equity as a function of ESG quality, (ii) loan portfolio quality and provisioning behavior, and (iii) operational efficiency through enhanced information transparency. Robustness tests include alternative ESG scoring schemes, sub-sample analyses by region and income level, and dynamic specification to capture persistence. Theoretical grounding rests on the Stakeholder Theory and the Legitimacy Theory for disclosures, complemented by the Resource-Based View to interpret ESG as a strategic asset influencing competitive advantage. A partial equilibrium lens will be adopted to interpret country-level regulatory heterogeneity. Expected findings indicate a positive and statistically significant association between high-quality ESG reporting and bank profitability and market valuation, with stronger effects in markets with stringent disclosure requirements and higher institutional quality. It is anticipated that ESG disclosures reduce information asymmetry, lower the cost of capital, and improve loan performance via enhanced risk governance, particularly for large, systemically important banks. Moderating effects are expected for banks with robust internal controls and for those subject to stronger external monitoring. The study contributes to knowledge by providing globally comparative evidence on the business case for ESG reporting in banking, clarifying transmission channels, and offering nuanced insights into how regulatory and institutional contexts shape ESG–performance linkages. The main conclusion is that credible and comprehensive ESG reporting is associated with superior bank performance, particularly where governance frameworks and regulatory regimes support transparency. Policy implications include reinforcing standardized ESG reporting requirements, encouraging supervisory emphasis on ESG risk disclosures, and promoting investor education on sustainability signals. Recommendations for practice emphasize integrating ESG data into risk management systems, aligning capital planning with environmental and social risk indicators, and enhancing disclosures to improve lender confidence and stakeholder trust. Suggestions for further research include exploring the causal impact of specific ESG metrics on performance during macroeconomic shocks and extending the analysis to cooperative and microfinance institutions.