UK Securities Law

Statutory Framework: FSMA 2000

The cornerstone of UK securities regulation is the Financial Services and Markets Act 2000 (FSMA 2000) , as amended. Part VI of FSMA governs the official listing of securities and the prospectus regime. The Act establishes a single regulator, the Financial Conduct Authority (FCA) , which acts as the UK Listing Authority (UKLA). The FCA’s statutory objectives include market integrity, consumer protection, and effective competition.

HSource for UK securities law is a layered architecture: primary legislation (FSMA), secondary legislation (statutory instruments), and the FCA’s Handbook of Rules and Guidance, comprising the Listing Rules (LR), Disclosure Guidance and Transparency Rules (DTR), Prospectus Regulation Rules (PRR), and Market Conduct Rules (MAR, distinct from EU MAR post-Brexit).

Prospectus Regime

The UK prospectus framework was substantially reformed post-Brexit. The Prospectus Regulation (UK version of Regulation 2017/1129, retained EU law under the European Union (Withdrawal) Act 2018) requires a prospectus approved by the FCA for offers of securities to the public or admission to trading on a UK regulated market. Exemptions include offers to qualified investors only, offers to fewer than 150 persons per Member State (now UK-only threshold), offers to investors acquiring securities for at least €100,000, and offers with a total consideration below €8 million over 12 months.

The Public Offers and Admissions to Trading Regulations 2024 (SI 2024/105), which came into force on 31 January 2024, introduced the most significant reforms to the UK prospectus regime in two decades. The reforms replaced the mandatory prospectus requirement for public offers with a new “public offer platform” regime and introduced a new “admission to trading” prospectus focused on investor information rather than the previous dual-purpose document.

Listing Regime

The FCA operates a Premium Listing and a Standard Listing regime. Premium listed issuers must comply with the super-equivalent Listing Rules, including the UK Corporate Governance Code (apply or explain), related-party transaction rules, and significant transaction rules (Class 1 and Class 2). Standard listed securities must comply with minimum EU-derived requirements (now UK minimum requirements) and relevant DTR provisions.

The London Stock Exchange (LSE) operates two primary markets. The Main Market includes both premium and standard listed securities and is a regulated market for the purposes of UK MAR. The Alternative Investment Market (AIM) is an exchange-regulated market (not a regulated market) operated by the LSE, governed by the AIM Rules for Companies. AIM issuers benefit from a lighter regulatory touch: no pre-vetting of admission documents by the FCA (only by LSE’s nominated adviser, or “Nomad”), no mandatory application of the Corporate Governance Code, and exemptions from certain DTR requirements.

Market Abuse Regime

The UK departed from EU MAR on 31 December 2020 but retained substantially similar provisions as UK MAR (retained EU Regulation 596/2014). UK MAR prohibits insider dealing (Article 8), unlawful disclosure of inside information (Article 10), and market manipulation (Article 12). The regime requires issuers to disclose inside information to the public as soon as possible (Article 17), maintain insider lists (Article 18), and report managers’ transactions (Article 19). The FCA has civil and criminal enforcement powers, including unlimited fines and public censure.

Insider Dealing: Criminal Justice Act 1993

In addition to UK MAR, insider dealing is a criminal offence under Part V of the Criminal Justice Act 1993 (CJA 1993) . The CJA 1993 defines an “insider” as a person who knows they have inside information from an inside source. The offence covers dealing in price-affected securities, encouraging another to deal, and disclosing information. Defences exist for market makers, those acting in the reasonable performance of their functions, and those who do not expect the dealing to result in a profit or avoidance of loss. Penalties include imprisonment of up to seven years and unlimited fines.

Disclosure and Transparency

Issuers with securities admitted to trading on a UK regulated market must comply with the Disclosure Guidance and Transparency Rules (DTRs) . DTR 2 requires disclosure of inside information. DTR 4 mandates annual financial reports (within four months of year-end) and half-yearly financial reports (within three months of the period-end—two months for UK-incorporated issuers). DTR 5 imposes the major shareholding notification regime: a shareholder must notify the issuer when their voting rights cross thresholds of 3%, 5%, 10%, 15%, 20%, 25%, 30%, 50%, and 75%.

DTR 6 contains rules on the dissemination of regulated information, requiring a “Regulatory Information Service” (RIS) approved by the FCA. DTR 7 (corporate governance) applies a “comply or explain” approach to the UK Corporate Governance Code for premium-listed issuers.

Post-Brexit Reform

The Edinburgh Reforms (December 2022) and the subsequent Wholesale Markets Review and Prospectus Regime Review seek to create a more competitive UK capital market. Key changes include the aforementioned prospectus reform (2024), proposed repeal and replacement of UK MAR with a tailored UK regime, reform of the prospectus liability regime, and the introduction of a new UK Retail Bond framework. The FCA’s Primary Markets Effectiveness Review (PMER) continues to examine listing rules, including dual-class share structures and special purpose acquisition companies (SPACs).

Enforcement

The FCA’s Enforcement Division investigates and prosecutes market abuse under UK MAR, insider dealing under the CJA 1993, and breaches of FSMA, including unauthorised business. The FCA can impose financial penalties of unlimited amount, issue public censures, and apply to the court for injunctions and restitution orders. Criminal prosecutions for insider dealing are brought by the FCA, with significant recent convictions resulting in custodial sentences.

Key Legislation Table