New AIM rules: what boards and audit committees need to know
The London Stock Exchange (LSE) has introduced a significant update to the AIM Rules for Companies, with the revised rules taking effect on 5 August 2026. The changes are designed to revive AIM’s position as a flexible growth market, support access to capital and attract both UK and international businesses.
Boards and audit committees should assess how the new framework may affect reporting obligations, transaction planning and investor communications.
For companies considering an AIM admission, as well as existing AIM-quoted businesses, the new rules introduce several changes affecting admissions, fundraising, corporate transactions, governance and financial reporting.
A simpler admission process
Perhaps the most notable change is the removal of the requirement for a formal working capital statement in an AIM admission document. Under the new rules, companies instead provide disclosures regarding their capital resources, financial obligations, intended use of fundraising proceeds and anticipated funding requirements over the following 12 months.
Companies can also incorporate publicly available information by reference within admission documents. This should reduce document length, avoid duplication and lower transaction costs for companies seeking admission.
In addition, UK-incorporated companies are now able to prepare financial statements under UK GAAP (FRS 102). This provides greater flexibility and may reduce reporting complexity for some businesses.
Similarly, companies incorporated in an EEA state may now use certain local GAAP frameworks permitted under the revised AIM Rules, rather than IFRS, subject to the requirements of the LSE.
Making AIM more international
To attract a broader range of issuers, a new Express Market route and a dual-market admission pathway are available. Together, these routes should make AIM more accessible to companies already listed on recognised overseas exchanges and businesses seeking a simultaneous admission to AIM and another qualifying market.
Introduction of special voting shares
Another significant change is the introduction of special voting shares. These structures may allow founders and key stakeholders to retain enhanced voting rights following admission, subject to strict safeguards and limitations. The change reflects growing interest in founder-led governance models and aligns AIM more closely with international capital markets.
Changes to acquisitions and corporate transactions
The revised rules aim to make acquisitions and corporate transactions simpler to execute, and acquisitive AIM companies should expect to face fewer regulatory hurdles. An acquisition that exceeds 100% in a class test will only be treated as a reverse takeover if it also results in a fundamental change to the AIM company’s business, board or voting control. This should mean only genuinely transformative transactions trigger the more onerous regulatory requirements. It should also reduce the risk of unnecessary suspension.
The substantial transaction threshold has also been increased from 10% to 25%, aligning the AIM rules with the UK listing rules, which will reduce the number of transactions requiring AIM rule 12 disclosure.
Supporting growth and access to capital
The reforms place a strong emphasis on making it easier for AIM companies to access capital. The new framework reflects the LSE’s desire to support growing businesses at a time when public market funding has become increasingly competitive.
A new Capital Access Window allows companies undertaking an equity fundraising to request a temporary suspension of trading while arrangements are finalised with investors. This is intended to make it easier for a company to market the issue to a wider range of investors, including retail investors, by providing more certainty over pricing during the process. While there is no time limit on a Capital Access Window, it is expected to be brief. The LSE will consider requests on a case-by-case basis.
The changes also sit alongside wider reforms to the UK’s public offers regime that make it easier for AIM companies to raise capital without the need for an FCA-approved prospectus in many circumstances.
Corporate governance code
AIM companies are no longer required to specify a recognised corporate governance code, such as the FRC’s UK Corporate Governance Code or the QCA’s Corporate Governance Code and comply or explain against it. Instead, companies are expected to focus on clear, meaningful disclosure across key areas like roles and responsibilities of directors, risk and controls, board composition, investor relations and remuneration and performance. This gives AIM companies more freedom to adopt governance arrangements that are better aligned to them.
What does this mean for companies?
The reforms give AIM companies greater flexibility around admission, fundraising, corporate transactions, reporting and governance. However, that flexibility does not remove the need for careful planning and clear disclosure.
Boards and audit committees should assess how the revised rules may affect their financial reporting framework, governance disclosures, transaction planning and investor communications. Companies considering an AIM admission, fundraising or acquisition should also consider how the changes may affect timing, documentation and stakeholder engagement.
Strong governance, transparent disclosure and effective investor engagement will remain critical to maintaining market confidence.
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If you are considering admission to AIM, a fundraise or an acquisition and would like to speak to our corporate finance team, get in touch.
