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Impact of Sustainability (ESG) Reporting on Firm Value of Listed Companies in Nigeria

Abstract

Sustainability reporting has become an integral component of contemporary corporate reporting as organizations increasingly recognize the importance of integrating environmental, social, and governance (ESG) considerations into their business strategies and disclosure practices. ESG reporting provides stakeholders with comprehensive information regarding a company's environmental stewardship, social responsibility, governance structures, risk management practices, and long-term sustainability initiatives. Unlike traditional financial reporting, sustainability reporting offers investors and other stakeholders valuable insights into non-financial factors that influence corporate resilience, reputation, competitiveness, and value creation. Globally, increasing concerns over climate change, environmental degradation, social inequality, and corporate governance failures have heightened the demand for transparent ESG disclosures. Consequently, international reporting frameworks such as the International Sustainability Standards Board (ISSB) Standards, the Global Reporting Initiative (GRI), and other sustainability reporting guidelines have encouraged companies to improve the quality and consistency of their ESG disclosures. In Nigeria, the Financial Reporting Council of Nigeria (FRCN), the Nigerian Exchange Group (NGX), the Securities and Exchange Commission (SEC), and other regulatory institutions have intensified efforts to promote sustainability reporting and responsible corporate governance among listed companies. Investors are increasingly incorporating ESG information into investment appraisal and portfolio allocation decisions because firms with robust sustainability practices are generally perceived as less risky, better governed, and more capable of generating sustainable long-term returns. However, despite the growing emphasis on ESG reporting, questions remain regarding its actual influence on firm value in the Nigerian capital market. While enhanced ESG disclosures may improve investor confidence, corporate reputation, and market valuation, inconsistent reporting practices and limited stakeholder awareness may constrain their effectiveness. Existing empirical evidence remains mixed due to variations in ESG measurement approaches, industrial coverage, and research methodologies. Against this background, this study investigates the impact of Sustainability (ESG) reporting on the firm value of listed companies in Nigeria. The study is anchored on Stakeholder Theory, Legitimacy Theory, and Signaling Theory. Stakeholder Theory posits that organizations enhance long-term value by addressing the interests and expectations of various stakeholder groups, including investors, employees, customers, regulators, communities, and the environment. Legitimacy Theory explains that companies disclose sustainability information to demonstrate compliance with societal expectations, strengthen corporate legitimacy, and maintain access to critical organizational resources. Signaling Theory argues that comprehensive ESG reporting serves as a credible signal of sound corporate governance, effective risk management, environmental responsibility, and sustainable business practices, thereby improving investors' perceptions and increasing firm value. Collectively, these theoretical perspectives provide a comprehensive framework for explaining the relationship between Sustainability (ESG) reporting and firm value among listed companies in Nigeria. The study adopts an ex post facto research design utilizing secondary data obtained from the audited annual reports, sustainability reports, integrated reports, and financial statements of companies listed on the Nigerian Exchange Group (NGX), together with relevant regulatory publications issued by the Financial Reporting Council of Nigeria (FRCN), the Securities and Exchange Commission (SEC), and other relevant institutions. A longitudinal panel data approach covering a ten-year period will be employed to examine the relationship between ESG reporting and firm value over time. Purposive sampling will be used to select listed companies with complete and consistent financial and sustainability reporting information throughout the study period. Sustainability (ESG) reporting will be measured using ESG disclosure scores, environmental disclosure index, social disclosure index, governance disclosure index, sustainability reporting quality, and overall ESG reporting index, while firm value will be measured using Tobin's Q, Market-to-Book Ratio (MBR), Market Capitalization, Price-to-Earnings (P/E) Ratio, Earnings per Share (EPS), and Economic Value Added (EVA). Data analysis will involve descriptive statistics to summarize the characteristics of the study variables, correlation analysis to determine the degree of association among variables, and panel regression techniques, including Fixed Effects and Random Effects models, to estimate the impact of ESG reporting on firm value. The Hausman specification test will determine the most appropriate estimation model, while diagnostic tests including multicollinearity, heteroskedasticity, autocorrelation, stationarity, normality, cross-sectional dependence, endogeneity, and model specification tests will be conducted to ensure the validity, consistency, reliability, and robustness of the empirical findings. The study anticipates that Sustainability (ESG) reporting will have a significant positive impact on the firm value of listed companies in Nigeria. Comprehensive ESG disclosures are expected to improve corporate transparency, reduce information asymmetry, strengthen investor confidence, enhance corporate reputation, and improve access to domestic and international sources of capital. Effective sustainability reporting is also anticipated to demonstrate sound environmental management, responsible social practices, ethical corporate governance, and proactive risk management, thereby reducing perceived investment risk and increasing market valuation. Furthermore, companies with high-quality ESG reporting are expected to attract socially responsible investors, improve shareholder confidence, strengthen stakeholder relationships, and enhance long-term financial sustainability. Enhanced ESG disclosure is also expected to improve regulatory compliance, support strategic decision-making, and increase organizational competitiveness in both local and international markets. Conversely, inadequate sustainability reporting may weaken investor confidence, increase uncertainty regarding corporate risks, expose firms to reputational challenges, and adversely affect market valuation. Consequently, companies that integrate sustainability reporting into their corporate reporting and strategic management processes are expected to achieve higher firm value, stronger market performance, enhanced corporate reputation, and sustainable long-term growth. This study is expected to make significant theoretical and empirical contributions to the literature on accounting, corporate finance, sustainability reporting, and corporate governance by providing robust evidence on the relationship between Sustainability (ESG) reporting and firm value among listed companies in Nigeria. Unlike previous studies that focused primarily on corporate social responsibility or isolated environmental disclosures, this research provides a comprehensive evaluation of ESG reporting using multiple sustainability dimensions and firm-level longitudinal panel data. The findings will provide valuable insights for the Financial Reporting Council of Nigeria (FRCN), the Nigerian Exchange Group (NGX), the Securities and Exchange Commission (SEC), listed companies, investors, financial analysts, corporate managers, sustainability professionals, policymakers, professional accounting bodies, and academic researchers regarding the strategic importance of ESG reporting in promoting corporate transparency, investor confidence, and long-term value creation. The study will also provide evidence-based recommendations for strengthening sustainability reporting frameworks, improving ESG disclosure quality, enhancing regulatory compliance, promoting responsible corporate governance, encouraging sustainable investment practices, and fostering sustainable capital market development and economic growth in Nigeria.

Keywords: Sustainability (ESG) reporting, firm value, listed companies, environmental disclosure, social disclosure, corporate governance, Tobin's Q, panel regression, Nigerian Exchange Group (NGX), Nigeria.