Jurisdiction(s):
United Kingdom

Related legal acts

Key definition

UK Market Abuse Regulation definition

What does UK Market Abuse Regulation mean? The term used in practice for the UK regime that governs insider dealing, unlawful disclosure of inside information and market manipulation in UK financial markets. Lawyers and regulators commonly call it UK MAR. It is the UK onshored version of Regulation (EU) 596/2014 (the market abuse regulation), forming part of domestic law under the European Union (Withdrawal) Act 2018 and amended by UK exit instruments; since 2024 it is treated as “assimilated law”. Key features include: scope over financial instruments admitted to trading on UK regulated markets, MTFs and OTFs (and related OTC conduct); issuer obligations to disclose inside information,...

UK Market Abuse Regulation (MAR) insider dealing: prohibitions, definitions, scope, legitimate behaviour, buy-back/stabilisation safe harbours, market soundings, PDMR closed periods, disclosure, insider lists, surveillance, and Brexit/EU developments

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Practice notes

This Practice Note presents an overview of the offence of insider dealing as defined by Assimilated Regulation (EU) 596/2014 (uk market abuse regulation). The insider dealing offence in Article 14 of the UK Market Abuse Regulation sits alongside the criminal insider dealing offence in section 52 of the Criminal Justice Act 1993, as well as the criminal offences of making misleading statements and misleading impressions under sections 89 to 91 of the Financial Services Act 2012.

Background and purpose

The EU market abuse regulation 596/2014 took effect throughout the EU on 3 July 2016. Its stated aim was to create a common regulatory framework addressing insider dealing, the unlawful disclosure of inside information and market manipulation (all forms of market abuse), together with measures to prevent market abuse so as to uphold the integrity of financial markets in the EU and to bolster investor protection and confidence in those markets.

Regulatory framework

At the end of the Brexit implementation period (11 pm UK time on 31 December 2020), the EU Market Abuse Regulation was onshored into UK law and amended by the Market Abuse (Amendment) (EU Exit) Regulations 2019...

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Web page updated on 27/05/2026

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