The effect of capital structure on stock futures Abnormal returns with regard to the level of concentration in the industry

The purpose of this paper is to investigation the relationship between capital structures and stock futures Abnormal returns. Also، this study is also sought to identify the contribution of concentration in the industry on the relationship between capital structure and future stock returns. The data used، has been extracted from firms is listed in the Tehran Stock Exchange in the period 1385-1391. For analyzing data and hypothesis testing has been used linear multivariable regression model base on panel data. The results from hypotheses testing show that there is a significant positive relationship between capital structures and future Abnormal Returns. On the other hand، the share of industry concentration is a significant and negative effect on the relationship between capital structure and stock futures Abnormal returns. Also، there is a positive relationship between growth opportunities and company size to stock futures Abnormal returns. There is a significant negative relationship between ratio price to earnings (P/E) and stock futures Abnormal returns.