The role of leverage on a portfolio of stocks due to the Financial health of companies

The aim of this study is to analyze the effect of leverage changes on stock return considering the different levels of the companies listed in Tehran Stock Exchange. The method of this research¡ regarding nature and content¡ is correlational¡ and purpose¡ application. This study is done using multiple regression and time series data for the period 2005-2012 for operating and listed companies in Tehran Stock Exchange. The results indicate that the expected return of sorted portfolios based on financial leverage has a significant difference with the actual return of these portfolios. Also¡ the leverage changes have a negative impact on portfolio returns. The intensity of the impact of leverage changes in higher levels of leverage is higher than the low levels of leverage changes. The intensity of the negative effects of leverage changes in high levels of leverage and lower health is more than low levels of leverage changes and higher financial health.