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Key definition
Market abuse definition

What does Market abuse mean? Market abuse describes conduct that undermines market integrity by using inside information or manipulating prices, orders or disclosures. In the UK, the civil market abuse regime is in the retained Market Abuse Regulation (UK MAR: Regulation (EU) 596/2014 as onshored), supported by the Financial Services and Markets Act 2000 and FCA rules and guidance. In Ireland, EU MAR applies and is enforced by the Central Bank of Ireland. Usage is consistent across England & Wales, Scotland and Northern Ireland (UK MAR) and Ireland (EU MAR). The regime covers behaviour relating to financial instruments admitted to trading, or for which admission...

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UK MAR and employee share incentives: implementation, amendments, PDMR notifications, closed-period dealing restrictions, insider lists, and practical guidance (CGI dealing code, AIM guidance, CLLS/ESMA Q&As)

Practice notes
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Implementation of MAR in the UK

Regulation (EU) No 596/2014, the market abuse regulation (MAR), took effect on 3 July 2016 and applied directly in the UK. MAR set out the framework governing insider dealing, unlawful disclosure of inside information, market manipulation, and measures designed to prevent market abuse. As a consequence, the Financial Conduct Authority (FCA) deleted the Model Code from the Listing Rules, and updated the FCA’s Disclosure Rules regarding the reporting of transactions by persons discharging managerial responsibilities (PDMRs) and persons closely associated with them (PCAs).

The European Union (Withdrawal) Act 2018 (EU(W)A 2018), as amended by the European Union (Withdrawal Agreement) Act 2020, created the structure and process for onshoring and preserving most EU and EU‑derived law to secure legal continuity following the UK’s exit from the EU. This included statutory instruments (SIs) which modify EU legislation so that it continued to operate effectively once the UK ceased to be subject to EU law—and those SIs also make amendments, mainly consequential in nature, to UK legislation. The SIs made under EU(W)A 2018 include...

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Ian Brown
Ian Brown chambers

Ian Brown is Senior Counsel at Slaughter and May in London, specialising in the implementation of executive and all-employee incentive plans. Since qualifying as a solicitor at a major City law firm in 2006, Ian has advised a wide range of UK and international companies on the adoption and operation of their bonus and share plans. Ian's practice incorporates drafting the formal rules for these arrangements, as well as ensuring their global legal and regulatory compliance....

Web page updated on 22/05/2026

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