MAR is Market Abuse Regulation which came into effect on 3 July 2016. It is an EU regulation on market abuse which aims to safeguard the integrity of financial markets and improve investors’ protection on and confidence in the markets.
MAR places an obligation on publicly listed companies and Financial Conduct Authority (FCA) regulated entities to maintain a list of all persons that have access to inside information. The FCA can demand firms subject to MAR provide them with a copy of their insider lists.