The investment committee is primarily a decision-making entity that aims to implement investment decisions taken by the company. In the framework of the powers conferred upon it by the board, the importance of this committee is highlighted and as such, in the present study, the primary aim is to examine the effect of investment on Saudi financial sector, an examination that is the first of its kind. The investment variable was measured by investment committee characteristic including, size, independence, meeting, commitment and allowance for session attendance. The study data was gathered from the annual reports of the financial firms spanning from 2014 to 2017. Panel data was used to conduct the hypotheses testing concerning the relationship among the variables of the investment commitment and the performance of the financial firms. Based on the findings, investment committee size and investment committee independence positively and significantly related with the performance of the firms. This study has several contributions to literature, particularly concerning information about the importance of investment committee. In addition, this study is clarified our understanding concerning best practices of corporate governance structure existing in Saudi financial listed companies.