Abstract The research aims to test the effect of disclosure of key audit matters on information asymmetry and audit report delay, The study used a sample of non-financial Saudi firms, with (105) firms, over the period (2015 - 2018), and by using multiple linear regression analysis methods, and Paired sample (T- test), the research provides empirical evidence that there is variance of the results obtained for the relationship between the disclosure of the key audit matters and the information asymmetry according to the length or shortness of the event window, while there is a positive relationship between the disclosure of key audit matters and audit report delay. Keywords: Key Audit Matters, Information Asymmetry, Audit Report Delay