The present study investigates the relationship between diversification strategy, capital structure and profitability in companies listed in the stock exchange through a combination of data panel and VAR methods. The present research was conducted for companies admitted to the Tehran Stock Exchange from 1387 to 1395 and 78 companies were selected as case study. Stationary and static tests were used to check the rationality of the behavior of variables. After assuring the rational behavior of variables over time and carrying out the correlation test, Chow (Flemmer) and Hausman tests were performed to determine the probability of collinearity in the regression model, and finally these tests were examined in the regression model using panel data with fixed effects. To ensure that the data panel model is evaluated, the residual was normalized and waste graph survey was performed. The research findings showed that the diversification strategy, capital structure and profitability in the companies accepted in the stock exchange has have a significant relationship. Also, the results of this study showed that diversification strategy has a significant effect on profitability.
