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In this paper, the relationship between ownership concentration and financial performance of companies in Singapore and Vietnam is investigated in a dynamic framework. By focusing on two different types of national governance systems (well-developed vs. under-developed), we observe how the relationship is moderated by the national governance quality. We find that the performance effect of concentrated ownership persists in these markets even after the dynamic nature of the ownership concentration–performance relationship is taken into consideration. Our finding supports the prediction of agency theory about the efficient monitoring effect of large shareholders in markets with highly concentrated ownership. In addition, we find that national governance quality does matter when explaining the ownership concentration–performance relationship. The positive effect of concentrated ownership on performance …