London Stock Exchange: Biggest Changes to AIM Rules in Two Decades

August 6, 2026

For more than 30 years, AIM has been Europe’s most successful growth market. The new rules, published today, are designed to ensure that AIM continues to support innovative and growing companies, their investors, and the wider AIM community, for the next three decades and beyond.

The new rules focus on supporting and facilitating companies to more easily raise capital, trade, and grow on AIM, reducing unnecessary friction with a simpler and more streamlined approach. They include:

• Making it easier to join the market: No more duplication of readily available information for admission documents or the need for unnecessary third-party reports. The ability to use UK GAAP and certain other local GAAPs, with no need for conversion.
• An express route for international companies: A genuine fast-track process for international public companies that are joining AIM from other markets.
• Support for acquisitions: For companies already on AIM, the new rules enable companies to undertake certain large acquisitions without the need to publish an admission document and without automatic market suspension.
• Voluntary trading pause: Introducing the ability for companies to request a temporary trading pause, called a Capital Access Window, that helps manage the process of fundraising and access a wider range of investors.
• Spotlighting the expertise of Nominated Advisers: Recognising Nominated Advisers as valuable sources of ongoing AIM and corporate finance advice for companies already on AIM.

These are just a selection of the changes that have been made. The new rules in full are now available to download here under the ‘Rules and regulations’ section.

The changes underline that AIM has the confidence and structures in place to back the bold ambitions of innovative and growing companies to achieve their AIM.