Template-Type: ReDIF-Article 1.0 Author-Name: Alkhawaja, Abdallah Author-Name-First: Abdallah Author-Name-Last: Alkhawaja Author-Email: Abdallah.Al-Khawaja@aum.edu.kw Author-Workplace-Name: College of Business Administration, American University of the Middle East, Kuwait Author-Name: Dsouza, Suzan Author-Name-First: Suzan Author-Name-Last: Dsouza Author-Email: Suzan.Dsouza@aum.edu.kw Author-Workplace-Name: College of Business Administration, American University of the Middle East, Kuwait Title: Governance Moderation in ESG Impact: Market Value Shifts Pre- and Post-COP 21 in the Oil and Gas Sector Abstract: This study examines the effect of ESG performance on firm market value in the oil and gas sector, using 6,872 firm-year observations from 52 countries (2011-2022). A two-stage least squares (2SLS) regression is employed to address endogeneity, with institutional governance government effectiveness, regulatory quality, and control of corruption tested as moderators. Results show ESG positively impacts firm value only after COP21. Institutional quality enhances firm value but weakens ESG's marginal effect. The findings highlight the conditional nature of ESG's value relevance and offer implications for firms, investors, and policymakers in varying governance contexts. Keywords: ESG, Corporate Governance, Firm Market Value, COP21, Oil and Gas Sector Journal: International Journal of Energy Economics and Policy Pages: 603-616 Volume: 15 Issue: 6 Year: 2025 Month: 10 DOI: 10.32479/ijeep.20969 File-URL: https://econjournals.com/index.php/ijeep/article/download/20969/9399 File-Format: application/pdf Handle: RePEc:eco:journ2:v:15:y:2025:i:6:id:20969