In the world and in our country, Iran, many researches have been done in the field of financing, but due to the importance of this issue, it needs more thought and contemplation. Therefore, this study assessed “the impact of investments on financing of companies listed on the Tehran Stock Exchange”. The statistical sample is consisted of companies listed on the Tehran Stock Exchange during a five-year period (2010-2014). Ultimately, regarding the limitation of the study and using systematic elimination method, data of 155 companies has been collected. This study in terms of the purpose is a practical research. In terms of type of research design because of relying on historical data, is post-event and its inference method is inductive and in correlation type. This study includes four major hypotheses. In this study to assess the hypotheses, the linear regression has been used. To analyse the data and test hypotheses, EVIEWS software is used. After design and test the study hypotheses that have been done by the separation of each hypothesis, we founded that the current and long-term investments have impact on financing methods through the sale of stocks and debt.
