ABOGUN SegunKARGBO, Sankay IsaacOrilonise MubarakOsemene F. Olubunmi2026-04-272026-04-272023Abogun et al.2536-6416https://uilspace.unilorin.edu.ng/handle/123456789/17721This study investigate the impact of Corporate Governance Code implementation and performance of listed firms in the Nigeria's financial services sector for the study period of 2018 to 2021, a period spanning the introduction of Nigerian Corporate Governance Code 2018.Corporate governance variables employed are board characteristics, assurance and firm size. The objective is to measure the degree of compliance of the firms with the NCCG 2018 and its principles and also evaluate the effect of the code on corporate performance. The study incorporates both qualitative and quantitative research methods, drawing data from 43 listed firms from 2018-2021. Using fixed effects regressions to analyze the governance-performance relationships, data is sourced from annual reports available on firm's websites and the Nigerian Stock Exchange website. The regression analyses reveal that the NCCG significantly impacts listed firms' financial performance by establishing effective board characteristics that drive strategic leadership and ethical culture. Findings also shows introduction of the code has led to improved firm performance and if all components are adhered agency problems will be reduced. However not all element of corporate governance has a significant effect on performance. From these findings it is recommended that Companies must cultivate efficient boards that foster ethical cultures, diverse skills, and strategic leadership to serve shareholders and stakeholders for sustainable success.enArticle