The European Securities and Markets Authority (ESMA) has published its fifth Report on the Quality and Use of Data, which highlights how regulatory data is used by EU authorities and efforts to ensure data quality. The report presents concrete cases of data use in market monitoring, supervision, enforcement, and policy making. One example is ESMA's reuse of existing data to reduce reporting burdens, such as using MIFIR transaction data for transparency and volume cap calculations. The report also showcases ESMA's Data Platform and improvements to data quality frameworks as key advancements in tools and technology. Additionally, it highlights data quality developments for EMIR REFIT, a new data quality framework for short-selling data, and improved accessibility of ESEF data. The report also provides an overview of sanctions imposed by national competent authorities (NCAs) on reporting obligations. A webinar will be held on May 15 to present the report in detail. The report aims to provide insight into the use of regulatory data and efforts to ensure its quality. ESMA's data quality initiatives are crucial for effective market supervision and regulation. The report is a valuable resource for stakeholders interested in EU financial markets regulation.