نشریه نظریه های نوین حسابداری
سال چهارم شماره 2 (پیاپی 12، تابستان 1393)

The Purpose of this study is initial to investigate Public Stock Offering Abnormal Returns in Listed Companies of Tehran Stock Exchange (TSE). Then, in this study to investigate the impact company characteristics include company size, leverage and growth opportunities on Public Stock Offering Cumulative Abnormal Returns. For this purpose, data from 70 companies in Tehran Stock Exchange that have been Public Stock Offering in the years after the initial Public offering during the period 2002 to 2011, is investigated Using panel data and multiple regression analysis method. Results represents an average rate of cumulative abnormal returns are 9/8 and 12/1 percent respectively for one week and two weeks after Public Stock Offering, and the existence of information asymmetry hypothesis was confirmed in the Tehran Stock Exchange. Also the result show there is a significant and negative relationship between company sizes, Public Stock Offering size and growth opportunities to cumulative abnormal returns. Also the result show there is a significant and Positive relationship between company leverage and cumulative abnormal returns.

The purpose of this study was to investigate of the role of institutional ownership type the report of the independent auditors in listed firms in the Tehran Stock Exchange. In fact, this study seeks to answer the question whether institutional ownership (institutional investors) can play an effective role in type the report of the independent auditors, and if so, how this effect can be explained? To answer this question, the report of the independent auditors of the Auditing Standard No. 700 (revised in 2011 and in force since 20.03.2012 ), the two kind Un adjusted opinion (accebtable) and adjusted opinion (eventhal, rejected and no opinion) has been separated. The sample consisted of 111 companies listed in Tehran Stock Exchange during the period 2004 to 2013. To test the hypothesis has been used of " logistic regression analysis". The findings of this study suggest that among percent ownership investors institutional and possibility unadjusted audit report, there is a relationship positive and significant. The results also show that there is a relationship negative significant among level of institutional ownership concentration and possibility unadjusted audit report.

The purpose of this paper is examining the impact of board characteristics on the efficiency of intellectual capital of the companies listed on Tehran Stock Exchange (TSE). Therefore, from Pulik’s model has been used as a proxy for intellectual capital. The research sample consists of 74 companies listed in the TSE. Research period covers a time span between 2005 to 2010. Multivariate regression statistical analysis was used to test the hypotheses of the research. The results show that there is a significant positive relationship between CEO duality and intellectual capital. But, there is not any significant relationship between other characteristics of board and intellectual capital.

The goal of the present research is to study certain firm features including: firm size, firm growth, and financial leverage and their effect on systematic risk in firms enlisted in Tehran Stock Exchange. Regarding theoretical foundations and research literature, a regression model was devised and used to analyze data. The statistical sample for this research included 85 companies from among firms enlisted in Tehran Stock Exchange during the time period between 2001 and 2011. The research results showed that firm size has had a positive and meaningful effect on systematic risk, but firm growth and leverage did not have a meaningful effect on systematic risk; but by considering firm size as control variable, the effect of firm growth on systematic risk in small and big companies will become meaningful.

Independent auditors are one of the most important users of internal auditor's works results. Therefore, different aspects of independent audit's works are affected by acquiring adequate cognition of internal audit's competence and also by relying on their activities outcome. One of the aspects is the time of conducting audit and the time of issuing independent auditor's report. As a result of this co-operation the audited financial statements are used timely by users. Therefore, the purpose of this research is to study the effect of internal audit's competence on delay of the exact time of independent audit's report presentation. These data are gathered by questionnaires which were presented to the internal audit supervises of 74 firms which are listed in the Tehran Stock Exchange. Our findings indicate that experience and professional skills as variables which represent internal auditor's competence, have relationship with the time of audit operation and finish. In other words, the more the internal audit's competence, the less the delay on independent audit's report.