Ownership concentration (OC) can affect a wide range of corporate governance (CG) mechanisms. Jordan is characterized by high OC such as family ownership and managerial ownership. The effectiveness of the audit committee (AC) as one of the major CG mechanisms is affected by OC, which in turn, affects accounting and market-based performance among Jordanian listed companies. Based on this fact, it is believed that OC can moderate the relationship between AC on accounting and market based performance in Jordan. The main purpose of this study is to examine the moderating effect of OC between audit committee effectiveness (ACE) and accounting and market based performance in Jordan. This study used data obtained from 828 firm-year observations of companies listed in Amman stock exchange (ASE) in industrial and service sectors from 2009 to 2017. The findings display that OC has a direct positive effect on ROE and ROA and a negative direct effect on TQ. The results revealed that OC positively moderated the relationship between ACE and ROE as well as ROA. However, OC did not moderate the effect of ACE on Tobin’s Q (TQ). Overall, the hypotheses are accepted in terms of ROA and ROE while it is rejected in terms of Tobin’s Q. OC only moderated the effect of ACE on ROA and ROE but not on TQ.

The Audit Committee (AC) is one of the most indispensable mechanisms of CG that impacts corporate performance. In Jordan, there exists a limited separation between the company owners and AC members, where executive managers from family owners make direct decisions and taking risks, consequently limiting the effectiveness of AC. The purpose of this study is to determine the effect of ACE on financial performance (FP) of companies listed on Amman Stock Exchange (ASE). It also aims to examine the moderating effect of enterprise risk management (ERM) between ACE and FP in Jordan. This study uses data from 2009 to 2017 with 92 selected firms cover a period of 9 years of companies listed in ASE in industrial and service sectors. Data was analyzed using STATA. The findings demonstrated that ACE has a significant relationship with ROA, ROE, and Tobin’s Q. Similarly, firm size has a positive relationship with ROA, ROE, and Tobin’s Q, while leverage and firm age have negative relationships with ROA, ROE, and Tobin’s Q. The tested model is statistically significant and can predict 46.7% of the variation in all performance variables. In terms of moderating effect, the findings showed that ERM positively moderated the effect of ACE on ROA and ROE in Jordan. However, it did not support the moderating role between ACE and Tobin’s Q. Decision makers have to enforce the implementation of ERM in Jordanian companies to improve the FP.