AIM is undergoing a significant overhaul — and for growth companies, founders and their advisers, the practical implications are substantial. On 4 June 2026, the London Stock Exchange published AIM Notice 62, proposing the most wide-ranging set of amendments to the AIM Rules in the market's recent history. The changes are designed to reduce the cost and complexity of admission to AIM, make it easier for companies to operate on the market and position AIM more competitively relative to both the Main Market and international alternatives. Whether you are an existing AIM company planning a fundraise or acquisition, a private company evaluating a public listing or a founder concerned about retaining control post-IPO, these proposals are directly relevant to your decision-making. The consultation is open for comment until 2 July 2026, with final changes expected to take effect in the autumn.
The Bigger Picture: Shaping the Future of AIM
These proposals do not stand alone. They are the product of a sustained period of market engagement that began with the "Shaping the Future of AIM" discussion paper and progressed through the November 2025 Feedback Statement, which confirmed the reforms that commanded broad market support. A number of the changes are already being applied as a matter of policy and are now being formally codified. The overarching objectives are to reduce disproportionate regulatory burdens, support fundraisings and acquisitions, cater to founder-led companies, attract international issuers and recognise investors' responsibilities in a buyer-beware market.
Streamlining Admission
The Exchange acknowledges that the AIM admission document has become increasingly complex and costly, acting as a barrier to entry. A wholesale redesign of the admission document will follow in a separate consultation, but in the meantime, the current proposals will deliver several immediate changes.
Most notably, the requirement for a working capital statement is to be removed and replaced with a disclosure-based regime, requiring details of the applicant's capital resources, financial obligations and anticipated 12-month fundraising needs. In addition, UK-incorporated AIM companies may use UK General Accepted Accounting Policies (“GAAP”) (Financial Reporting Standard 102) instead of International Financial Reporting Standards (“IFRS”), with other local GAAPs permitted where IFRS equivalency is demonstrated. Such a change avoids undertaking an IFRS conversion project, saving significant risk, cost and time. Companies will also be able to incorporate information by reference, and the requirement for an admission document when admitting a second line of securities has already been removed under the Public Offers and Admissions to Trading Regulations changes.
Capital Access Window
A new "Capital Access Window" will allow AIM companies undertaking an equity fundraise to voluntarily request a temporary suspension of trading. This is intended to help companies manage the fundraising process more closely — particularly where wide investor distribution creates volatility concerns — and is expected to support broader retail participation.
A More Practical Approach to Acquisitions
The proposals significantly recalibrate how acquisitions are treated. An acquisition will no longer be classified as a reverse takeover solely because it exceeds 100 per cent. in the class tests; it must also involve a fundamental change to the AIM company's business, board and/or voting control. Non-transformative acquisitions will instead be treated as substantial transactions under AIM Rule 12, with proportionate disclosure and, potentially, shareholder approval, removing the need for burdensome reverse-takeover machinery.
Other changes include removing the automatic suspension on notification of a reverse takeover in contemplation (where the nominated adviser is satisfied that alternative disclosure is adequate), and aligning with the Main Market to increase the class test threshold for determining whether a transaction constitutes a substantial transaction from 10 per cent. to 25 per cent.
Attracting International and Main Market Companies
The current AIM Designated Market route is to be replaced by a new "Express Market" route, broadening eligibility to companies from jurisdictions recognised as comparable based on International Organization of Security Commissions principles. As such, for relevant companies, the admission process will be faster — a three-day gazetting period, no AIM Rule 7 lock-ins — and Main Market transferees will benefit from an accelerated process. Furthermore, a new dual-market applicant route will allow companies seeking simultaneous admission to an Express Market and AIM to leverage the same disclosures for both, subject to limited additional content requirements and a minimum £6 million fundraise.
Greater Flexibility for Growth and Founder-Led Companies
The Exchange recognises that founder-led and growing companies are a vital part of AIM’s ecosystem. In order to better support these types of companies, the proposed changes are intended to give them greater flexibility to operate in a manner that is better suited to their current needs. Consistent with current policy, Nomads will no longer be required to give a fair and reasonable opinion in respect of non-standard director remuneration packages used to attract and retain talent, provided that standard commercial protections are afforded to the AIM company. The ability of an AIM company to be able to offer special voting or dual-class shares in order to enable founders to retain control of the company at the time of IPO will also be codified in the AIM Rules, based on the Main Market experience of dual-class share structures.
Refocusing the Nominated Adviser
The current AIM Rule 11 general disclosure obligation is to be removed on the basis that it is duplicative of the UK’s Market Abuse Regulation. A replacement AIM Rule 11 will instead focus on leveraging the nominated adviser's corporate finance expertise to help AIM companies understand the market impact of business developments when considering their own UK MAR obligations. However, the Exchange retains its powers to require disclosure under AIM Rule 22 and to refer matters to the FCA. A new Nominated Adviser Technical Note, to be consulted on separately in AIM Notice 63, will set out the Exchange's expectations in respect of certain Nomad responsibilities.
Buyer Beware and the Right of Reply
The lighter regulatory touch is accompanied by a strengthened buyer-beware statement in the introduction to the AIM Rules, making clear that investors must consider the risk profile of AIM investments. In addition, the Exchange is also proposing a voluntary framework for disclosing engagement with proxy advisors and introducing a voluntary "right of reply", enabling AIM companies to respond to misleading or abusive third-party commentary on bulletin boards and social media.
What’s Next
These changes demonstrate the Exchange’s commitment to supporting high-growth companies and making the UK a more attractive place to list. Once the final rules are published, AIM companies will need to review their existing governance disclosures, admission planning timelines and transaction playbooks against the new framework. For private companies weighing up a potential AIM admission, the removal of the working capital statement, acceptance of UK GAAP and the introduction of dual-class share structures collectively lower barriers in ways that may alter the cost-benefit analysis. We would encourage clients to engage with the consultation and to speak to us about how these changes may affect their specific circumstances.
How We Can Help
Haynes Boone’s London Capital Markets team advises on company transactions, including IPOs, reverse takeovers and dual listings. The team has led landmark deals across mining, energy, tech and life sciences, including one of the largest IPOs in LSE history and the first Nasdaq-London dual listing of this century. As a top 10 law firm by total number of AIM clients, the practice is recognised for its strong AIM market presence, advising issuers, nominated advisers and brokers on AIM IPOs and equity fundraisings.
In 2026, the London Capital Markets team has represented Rift Helium on its AIM IPO and advised Chariot Limited and Helix Exploration PLC on equity fundraisings. The team also acted for nominated advisers and brokers on AIM transactions for Star Energy Group PLC, Zanaga Iron Ore Company and Kelso PLC. Clients rely on our cross-border experience and integrated counsel across all major U.S. and UK exchanges.
