Key takeaways
AIM admissions now use MTF admission prospectuses
FCA approval is not required, preserving AIM’s speed and flexibility.
Secondary fundraisings remain quick and uncomplicated
No 75% issuance threshold applies, keeping follow-ons efficient.
Forward-looking protections are more limited on AIM
Most required disclosures cannot be PFLS, increasing verification importance.
The UK’s new prospectus regime (the POAT regime) came into force on 19 January 2026, introducing significant changes to the rules governing capital raising and admissions to trading. Although much of the reform is directed at the Main Market, the London Stock Exchange (LSE) has also amended the AIM Rules for companies (AIM Rules) to align them with the Public Offers and Admissions to Trading Regulations 2024 (POATR) and the FCA’s Prospectus Rules: Admission to Trading on a Regulated Market (PRM).
In this article we summarise what has changed and what it means in practice for AIM listed companies and AIM applicants.
AIM’s status under the new regime
AIM market is classed as a primary multilateral trading facility (primary MTF) for the purposes of the POAT regime. This brings the AIM market within the scope of the POAT regime, but admissions to AIM continue to be managed by the AIM Regulation team at the LSE, with the LSE (as AIM operator) retaining responsibility for determining admission document requirements.
AIM admission documents: what has changed?
A company seeking admission to AIM must now produce an MTF admission prospectus. This document is broadly a subset of the content required for a Main Market prospectus and, importantly, does not require FCA or LSE approval, even where the issuer is offering shares to retail investors.
The content requirements of an AIM admission document continue to be set by the LSE rather than the FCA. However, the document must now include the general requirements of Regulation 23 of the POATRs. Regulation 23 is incorporated by reference into the AIM admission document requirements and requires MTF admission prospectuses to include the necessary information which is material for an investor to make an informed assessment of:
the assets and liabilities, profits and losses, financial position and prospects of the issuer and of any guarantor.
the rights attaching to the transferable securities.
the reasons for the issuance and its impact on the issuer.
This language is very similar to the requirements of paragraph (k) of Schedule Two to the AIM Rules, which refers to including information the issuer 'reasonably considers necessary'. However, Regulation 23 contains no reasonableness standard, meaning that a matter incorrectly but reasonably omitted could still amount to a breach of Regulation 23. Regulation 23 also focuses on enabling investors to make an 'informed assessment', rather than achieving a 'full understanding' as required by paragraph (k), with the former likely to be regarded as a lower standard. In practice this is likely to make little difference to the content but issuers should be aware that in Regulation 30 of POATR there is a particular limb of liability for omission of any matter required to be included by Regulation 23 of POATR which explains why the LSE chose to incorporate this by reference.
Other content requirements for an AIM admission document remain unchanged, except updated cross-references to the re-ordered Annexes in the PRM and a new requirement to disclosure that, where a supplementary admission document is published, investors may exercise their withdrawal rights, details of which are set out in MAR 5-A.3. The carve-outs in Schedule Two to the AIM Rules from the full prospectus requirements remain the same in the revised rules.
In respect of who is responsible for an AIM admission document the LSE has also removed the cross reference to the now revoked Prospectus Rules and incorporated the relevant provisions from PRM 3 on who takes responsibility.
Forward-looking statements (PRM 8)
PRM 8 applies to forward looking statements included in an admission document / MTF admission prospectus. A statement will be a protected forward-looking statement (PFLS) only if it falls within the PRM definition and the specific conditions in PRM 8.1.3R, and if it is clearly accompanied by both:
an accompanying statement with prescribed content appearing once in the document; and
a content-specific PFLS statement, placed immediately alongside the relevant disclosure which identifies it as a PFLS statement and explains its assumptions and specific disclosures in the case of PFLS related to historical financial information.
The liability standard for PFLS is recklessness/dishonesty, whereas all other statements are subject to a negligence standard.
Most information that is required to be disclosed under Schedule Two to the AIM Rules is excluded from the definition of PFLS. However, some of this information can be within the meaning of PFLS but this is limited to certain information on the business overview and trends.
When is an MTF admission prospectus required on AIM?
First admissions and reverse takeovers
An AIM admission document remains required:
on admission to AIM; and
on a reverse takeover.
This position is unchanged but is now clearly aligned with the new legislation.
Further fundraisings
For existing AIM companies:
further issues of shares by existing AIM companies are outside of the PRM regime and are governed by MAR 5-A and the AIM Rules, which do not generally require an admission document or MTF admission prospectus for vanilla secondary issues;
the annual rolling 75% limit on issues of new shares without a prospectus that applies to Main Market issuers does not apply to AIM issuers.
This preserves the speed and flexibility of AIM placings and other follow on fundraisings.
Disclosure standards and liability
The AIM Rules have been updated to ensure consistency with the new legislative framework. Companies should be aware that:
directors remain responsible for the accuracy and completeness of AIM admission documents;
the revised statutory liability regime applies to AIM admission documents; and
protections for forward looking statements are more limited on AIM than on the Main Market.
Careful verification and drafting discipline therefore remain essential.
What has not changed
The LSE has deliberately avoided introducing additional regulatory burdens for AIM companies. AIM continues to offer flexible and efficient capital raising without routine prospectus publication and its regulatory model remains distinct from the Main Market. However, AIM remains constrained by the boundaries set out in MAR 5-A which do limit the LSE’s freedom of manoeuvre.
Practical next steps for AIM companies
Companies considering admission to AIM or existing AIM companies considering capital raisings should:
ensure that they understand the new PFLS statement regime which may create increased scope for discussion of future matters in AIM admission documents;
ensure their advisers are aware of the additional admission document / MTF admission prospectus disclosure requirements relating withdrawal rights; and
review internal processes for identifying and flagging forward-looking statements.
The LSE previously confirmed that it intended to launch a consultation on changes to the AIM Rules and a new technical note for nominated advisers in the first half of this year. However, this is unlikely to result in changes to the AIM Rules in 2026. We will provide a further update when the changes are published.
How we can help
We advise AIM companies and their boards on admissions, fundraisings and disclosure obligations under the new UK prospectus framework. Please contact us for tailored guidance.
