One of the ways to try to regulate the work of audit firms auditing the financial statements of public-interest entities is also to publish a Transparency Report. Audit firms that audit entities of public interest are required by the Audit Act and Regulation (EU) No 537/2014 to compile and make public the Transparency Report. The aim of the paper is to analyze the Transparency Report for year 2017 of 5 large and 5 small audit firms, ie, whether the Transparency Reports have all the elements in accordance with the Regulation and it is necessary to determine the quality of the published information within the Report. Also, Reports are very often used for marketing purposes, which is certainly not a measure of the quality of the audit carried out and may contribute to a false impression of the audit firms themselves. The empirical part of the paper analyzes the Transparency Reports of 10 audit firms auditing public interest entities. Of the 10 companies, 5 are larger and 5 are smaller. It is evident that a small number of companies are transparent, since the Reports of most companies do not contain all the essential elements, but significant differences can be observed when it comes to the quality of the published Reports. Larger companies have substantially more extensive reports, but this is by no means a measure of the quality of the reports, since no data on the names of the members of the management of the companies, data on employee benefits, benefits to partners and others have been published. There are certainly many improvements to be made when it comes to the quality of the Transparency Report, and although some of the Reports contain all the elements and are extensive in number of pages, some of the information that may be desirable has been ignored.