One of the key objectives of ESMA is to foster and increase supervisory convergence across NCAs. Thematic studies have been identified as a means of achieving this objective. Their aim is to review supervisory practice in the Member States, identifying good or best practices where possible. In 2016, ESMA conducted a thematic study on the operation of home and host responsibilities under AIFMD and UCITS with a view to promoting smooth operation of the EU passports for marketing and management, looking at the notification frameworks contained in the UCITS Directive and AIFMD. The findings of the thematic study form the core of this report. They are supplemented, where possible, by a number of recommendations on good supervisory practices.