The main objective of this study is to examine the impact of ownership structure on the corporate performance of the Malaysian public listed companies (PLC). Empirical evidence suggests that insider and institutional shareholding do not influence the corporate performance of the Malaysian PLC. The results seem to suggest that institutional shareholders have failed in their monitoring role and principal agent problem will not be solved by increasing the director’s shareholding in the company. Despite segmenting the company according to market capitalization, results do not differ significantly. The relationship between corporate performance and insider and institutional shareholding is only significant in big market capitalization companies.