M.A. Thesis:

Investor sentiment٫Firm life cycle and corporate risk

One of the first concerns is the risk of investment And successful investors are those who accept the acceptable level of risk, earn high returns. Risk as a criterion in making investment decisions is important. This study aimed to investigate Investor Sentiment adjustment effect on the relationship between Firm Life Cycle and Companies Risk are companies listed on the Tehran Stock Exchange has been done. The sample consisted of 183 now and in the years (2010_2016) occurred. By analyzing companies listed on the Tehran Stock Exchange using statistical tests, trying to find answers to these questions Whether in the rise and fall of the life cycle, the company's risk is higher but less mature stage? Is also in the stage of growth and decline of the life cycle, when there is a high tendency of investment, risk is now higher than that of low affinity invest there The results of the tests can be at the level of 5 percent between stages of emergence, maturity and decline life cycle, Risk-significant relationship between maturity and growth was achieved. And other steps the company has no significant relationship with risk. The emergence, maturity and decline life cycle when there is a high tendency of investment, there is no significant relationship with the company's risk.

Keywords: Investor Sentiment- Firm life cycle - companies risk.