AIM resources

AIM resources

This subtopic highlights relevant commentary, analysis and resources to assist with the interpretation of, and provide practical guidance on the application of, the AIM Rules for Companies, the Disclosure Guidance and Transparency Rules (where applicable to AIM companies), the UK Prospectus Regulation and the UK market abuse regime.

AIM—regulatory status

AIM is a market operated and regulated by the LSE in its capacity as a recognised investment exchange under the Financial Services and Markets Act 2000 (FSMA 2000). It is intended primarily for equity securities of smaller and growing companies that may not yet qualify for the Main Market. It is regulated separately from the Main Market for listed securities. AIM is not a UK regulated market but instead falls within the definition of a UK multilateral trading facility (as defined in the FCA Handbook glossary and in the UK Markets in Financial Instruments Regulation (EU) No 600/2014). As AIM is not a UK regulated market, securities admitted to AIM do not need to be admitted to the Official List.

AIM was registered as an SME growth market on 3 January 2018. The designation ‘SME

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Latest Corporate News

Corporate weekly highlights—20 November 2025

This week's edition of Corporate weekly highlights includes: a news analysis of the timelines and steps for individuals to verify their identities at Companies House and the publication of guidance by Companies House on how it will enforce compliance with new mandatory identity verification requirements, the publication of the FRC’s annual review of corporate governance reporting under the 2018 UK Corporate Governance Code, and details of executive remuneration in the Investment Associations' principles of remuneration for 2026.

DBT publishes PSC guidance under the Economic Crime and Transparency Act 2023

The Department for Business and Trade (DBT) and Companies House have published new statutory guidance following the implementation of a new regime for people with significant control (PSCs), which came into force on 18 November 2025 under the Economic Crime and Transparency Act 2023. The revised framework enhances transparency and accountability in corporate ownership by clarifying the meaning of ‘significant influence or control’ for eligible Scottish partnerships (ESPs) and related entities. The guidance explains how to identify individuals or legal persons who exercise significant influence or control over an ESP and sets out the corresponding reporting duties to Companies House. Failure to comply with these statutory obligations may constitute a criminal offence punishable by fines or imprisonment.

Companies House publishes form for additional PSC identity verification deadline extensions

Companies House has published guidance on requesting an additional extension to the identity verification deadline for a person with significant control (PSC). This process applies only where the PSC has already received two previous extensions through the 'Provide identity verification details for a person with significant control' service. The request must be submitted before the current deadline expires and must include the PSC’s full registered name, the relevant company number, a justification for the extension, and up to two pieces of supporting evidence, such as proof of pending identity documents, confirmation of a scheduled Post Office verification, medical documentation, evidence of technical difficulties, or confirmation of a correction to company records. Each request is reviewed by an examiner, and if accepted, the PSC’s verification deadline will be extended by up to 14 days beyond the existing date; if rejected, the original deadline remains in force. Failure to comply within the applicable timeframe constitutes a legal offence, and Companies House will issue a default letter outlining the relevant breaches. All decisions are made at the registrar’s discretion.

Companies House outlines enforcement for identity verification breaches

Companies House has published guidance setting out how it will enforce compliance with new mandatory identity verification requirements for company directors, people with significant control, and authorised agents under the Companies Act 2006. The body will use a graduated approach—informing, guiding, and then sanctioning non-compliant individuals or companies—through prosecution, referral to the Insolvency Service or financial penalties. Serious or repeated breaches may result in criminal conviction, disqualification or removal from the register. The approach will be reviewed and adjusted over time to ensure effectiveness and proportionality.