This study investigates the relationship that exists between corporate governance and firm performance of some selected companies listed on the Nigerian Stock Exchange. The intent of the study is to determine whether corporate governance mechanisms- CEO duality, board size audit committee independence, and ownership concentration have an impact on firm performance surrogated by return on assets (ROA); return on equity (ROE), profit margin (PM). It provides empirical evidence for fifty two (52) non-financial firms in Nigeria for a period of 2003 to 2008. The Generalised Least Square (GLS) regression is employed to examine the relationship existing between the variables. The results reveal that board size, audit committee independence, ownership concentration have a significant relationship with return on equity and profit margin. It is also observed that CEO duality has no impact on firm performance. The advocacy is for the Securities and Exchange Commission to take into cognisance industry specific effects before formulating codes of corporate governance that determine the characteristic of the audit committee or the board structure. Proposition is also made for the Corporate Governance Committee of companies to endeavour to do a regular appraisal of their corporate governance compliance status so as to understand its effect on performance.
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