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This study aims to investigate the relationship between chief executive officer (CEO) narcissism and internal control weaknesses in the Iranian listed companies.

The study’s statistical population consists of 1,309 firm-year observations from 2012 to 2018. Multivariate regression and the least squares regression are used in this study to examine the hypothesis.

The hypothesis confirms a positive and significant relationship between the CEOs’ narcissism and the internal control weaknesses (ICWs). In other words, managers with narcissistic personality traits prioritize their position, interests and goals. Therefore, there is more possibility of information distortion and denying the existing internal controls, leading to an increase in misreporting.

In this paper, two variables, including the manager’s signature and the managers’ cash compensation index, are used to assess the CEO’s narcissism, leading to more accurate results. This is also the first study examining CEO narcissism and internal control weaknesses, especially in the emerging market.

This paper aims to determine whether there is a relationship between intellectual capital and social capital and internal control weaknesses and assess the relationship between the variables of intellectual capital and social capital and internal control weaknesses.

The statistical population consists of 1,309 firm-year observations from 2014 to 2020. The research hypothesis is tested using statistical methods, including multivariate, least-squares and fixed-effects regression.

The results demonstrate a negative and significant relationship between intellectual capital, social capital and internal control weaknesses. The study also finds that increased intellectual and social capital quality improves human resource utilization, control mechanism, creativity and firm performance. The results also show that intellectual capital and social capital enhancement will reduce internal control weaknesses in the upcoming years.

This paper is the pioneer study on the relationship between intellectual capital and social capital and internal control weaknesses in Iran, carried out separately and in exploratory factor analysis. This paper considers intellectual capital components for theoretical factor analysis, including human capital, structural capital and customer capital. Internal control weakness is assessed based on financial, non-financial and information technology (IT) weaknesses.