High investor sentiment has been linked with opportunistic managerial behavior in the face of more optimistic investors and analysts. In this study, this line of work is developed by documenting the increased likelihood of misstatements and the consequent increase in audit risk in the face of high investor sentiment. The main objective of this study is to investigate the effect investor sentiment on misstatements, and auditor behavior of listed companies in Tehran Stock Exchange. The sample consists of 94 firms listed in Tehran Stock Exchange in the period from 2017 to 2021. The research hypotheses are tested using multivariate regression model with panel data method. The results show that investor sentiment has significant positive effect on the misstatements within 95% confidence level. In addition, other findings indicat existence of a significant positive effect investor sentiment on audit fees and going concern opinion. As a result, the findings enhance the understanding of how investor sentiment affects misstatements, and auditor behavior, and enrich the literature on corporate auditor pricing and reporting decisions.

Behavioral finance perspectives state that investor sentiment affects stock price. Managers being aware of behavioral finance effects on stock price are expected to be more careful in their decision for earnings management. The sample consists of 475 observation (firmyear) in the period from 2010 to 2015 and the aim is to examine the relation between investor sentiment and accounting earnings management. To measure the investor sentiment and accounting earnings management, Shamsoddini (2015) and kaznic (1991) models are used respectively. The results show a significant positive relation of the momentum effect and value premium (price/earnings) variables to accounting earnings management. As a result, investors' short-term attitudes affect the extent of accruals manipulation. However, there is no significant relation between the investor sentiment and real earnings management.

The purpose of this study is to investigate the relation between investor’, s sentiment and bias in management earnings forecast. To do this, three hypotheses are formulated. The sample consists of 165 firms listed in Tehran Stock Exchange during 2010-2010. The research method is the multivariate regression model using the panel data method. The results of research hypotheses show that investor sentiment has a negative and significant relationship with bias in the management earnings forecasts,In addition, according to the research results, managers' annual earnings forecasts are not more optimistic when investors are optimistic, nevertheless, it is optimistic when investors are pessimistic. However, there is no significant difference between investor sentiment and managers' predictions in firms with higher uncertainty.

In previous studies, the informational content of accounting variables was examined under conditions of the classic assumptions of economics and finance, that such a framework does not provide an insight on the effects of irrational behaviors of investors. However, theoretical literature and the results of recent empirical studies suggest that feelings of investors can affect their response to accounting information and evaluation of companies' stock. Given the evidence of previous studies on the difference between the reactions to the accounting earnings news, the effect of investors' tendencies on the estimation of the coefficient of reaction to the accounting earnings and each of its components are examined empirically in this study. Based on the data of 100 listed companies in Tehran Stock Exchange between the years 2010 and 2017, the results show that current and future earnings have a positive and significant effect on stock returns, but investors' tendencies can decrease the coefficients of response to current earnings. Further investigations suggest the negative effect of investors' tendencies on the coefficient of cash and accrual components of future earnings reflected in current stock returns.

The study of business cycles is important because economic planning does not make sense without understanding how GDP fluctuates and the root of these fluctuations. Therefore, making attempts to recognize the structure of business cycles fluctuations created in the economy can help us improve the decision making process. The greater the economic fluctuations or business cycles, the more instability in the economy, and investors can't predict a clear image of the future. The purpose of the current study was to investigate the effects of Iran crude oil business cycles on the 266 companies in Iran stock exchange during the period from 2005 to 2015. Thus, the crude oil business cycle was calculated using Hedrick Prescott filter and then the effects of crude oil business cycle was on the investors' sentiments was estimated using Generalized Method of Moments (GMM) approach. The results of the study indicated that when the crude oil business cycle shows a boom, investors' sentiments is greater than the time when the crude oil business cycle shows a period of recession; meaning that the crude oil boom leads to an increase in investor sentiments.

Purpose: The purpose of this study is to investigate the effect of investors' sentiments on the social responsibility performance of companies listed on the Tehran Stock Exchange. Therefore, it tries to examine and evaluate how companies react to these sentiments and decide on the level of social responsibility resulting from companies' private information. Methodology: For this purpose, data related to 120 companies listed on the Tehran Stock Exchange during the period 2009 to 2020 were extracted and the combined data regression model was used to test the research hypotheses. Results: The results show that investors' sentiments based on stock turnover and stock spending have a significant effect on the company's social responsibility activities. According to the research results, it can be stated that the impact of social responsibility activities on the company's performance has been confirmed. Also, the results show that corporate valuation constraints do not have a significant effect on the relationship between investor sentiment and corporate social responsibility activities. Finally, the interactive effect of investors' horizons and investors' sentiments on the company's social responsibility activities is confirmed in terms of stock turnover, but is rejected in terms of stock spending. Conclusion: The results of this study indicate that social responsibility activities lead to an impact on stock markets. In other words, after high emotional periods, socially responsible companies get lower returns. Therefore, as an important corporate strategy, disclosure of social responsibility is affected by the investor’, s sentiments. Contribution: Changes in investors’,sentiment led to the identification of risks and opportunities associated with changes in corporate behavioral factors and provide the conditions for improving social responsibility activities.