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This article examines the association between the equity concentration and agency costs as well as the impact of agency costs on performance of non-financial firms listed on the Saudi Stock Exchange (Tadawul). These relations are examined by using dynamic panel data and a two-step robust system estimation for the period 2010–2013. The study uses three proxy variables to measure agency costs. The results show that the equity concentration has no significant impact on agency costs, and the agency costs have no significant impact on firms’ performance. In addition, the study shows no evidence to support the agency theory in non-financial firms listed on the Saudi Stock Exchange (Tadawul). This study provides a better understanding of the association between equity concentration, agency costs and a firm’s performance.

This paper examines how free cash flow and equity concentration are associated with agency costs, and how they influence the profitability of insurance firms listed on the Saudi Stock Market. The results indicate that equity concentration has no significant impact on agency costs, free cash flow has no significant impact on agency costs and agency costs have no significant impact on firm's profitability. The findings of this study do not show any evidence to support the agency theory among insurance firms listed on the Saudi Stock Market.