The study aimed at external auditing and the financial performance of Marianum press limited, Kisubi and it was guided by the following objectives; to determine the effect of verification of accounting data and financial performance of organization in Kisubi, to determine whether or not external auditors exercise professional ethics and competences while auditing organizations in Kisubi and to ascertain the effect of internal control on the performance of organizations in Kisubi. However, upon comparing the Jarque-Bera value (0.9) with the significance level (0.05), we reject the null hypothesis and conclude that the disturbance terms are not normally distributed since 0.9 is greater than 0.05. According to the findings, the research study establishes that the effectiveness of verification of accounting data on accountability of a Marianum Press limited ensures avoidance of manipulation of accounts, ensures proper valuation of public assets, enhances proper recording and valuation of assets, ensures arithmetic accuracy of accounts, detection of frauds and errors in the transactions and it exhibits a true and fair view of the state of affairs of a Marianum Press limited. It is evident that as much as internal auditing exists in Marianum Press limited, it is inadequate and inefficient in management of accountability and improvement of performance. This therefore calls for a stronger and effective auditing genre (External auditing or statutory auditing) to help the Marianum Press limited improve on Accountability, Quality service delivery and Economic efficiency alias Performance of the Marianum Press limited appropriately.