The regulation concerns individuals or firms that are trading in or issuing financial instruments that are on a stock exchange or an MTF platform as well as transactions that take place outside the trading venues.
Individuals and firms disseminating information about financial instruments or issuers of these instruments are also covered by the regulations.
Here you will find information about how to to report to FI's PDMR transaction register: PDMR Transaction Register (MAR)
The European Securities and Markets Authority (ESMA) has published instructions on how to access the reference data that is covered by the MAR and MiFID II/MiFIR regulations. The EU authority has also published current reference data that is available for download.