This study investigated the effect of financial reporting quality, family ownership and audit quality on investment efficiency among Tehran Stock Exchange companies. In this applied, descriptive-correlational research, post-event method is used. Examining the research variables was also done using the information of the financial statements of the companies admitted to the Tehran Stock Exchange. The time period of the study includes the years 1390 to 1399 and the selected sample was selected using the accessible society method, consisting of 143 companies admitted to the Tehran Stock Exchange. Multiple regression was used in R software to classify the data collected from Excel software and to test research hypotheses. Based on the statistical analysis, the results at the five percent error level showed that there is a significant relationship between the quality of financial reporting and investment efficiency. There is no significant relationship between family-owned companies and investment efficiency. Audit quality does not moderate the relationship between financial reporting quality and investment efficiency. Audit quality does not moderate the relationship between family-owned firms and investment performance.