"This study aims to provide additional insights into the relationship between governance mechanisms and firm financial performance in Nigeria. The article focuses on the five dimensions of corporate governance,abstracting from other dimensions such as incentive schemes. The evidence would serve as important quantitative information into the cauldron of policy as well as add to the existing body of empirical literature from a developing stock exchange such as that of Nigeria. The need for a study of this kind is even more important in an environment like Nigeria’s, which is characterized by growing calls for effective corporate governance, particularly for public limited liability companies. This call is understandable in view of the importance of effective governance at both microeconomic and economy-wide levels."