AIM (London): Listing Requirements and IPO Guide

Headquarters

London, United Kingdom

Region

Europe

Market Focus

Growth & Small Cap

Overview

AIM is the London Stock Exchange's market for smaller and growing companies. It launched in 1995 and has since hosted thousands of companies from the UK and around the world.

Instead of a regulator approving each admission document, AIM relies on a nominated adviser, or Nomad, who confirms a company is suitable and stays with it for as long as it remains on the market.

Known For

Smaller UK and international growth companies
Natural resources, technology and life sciences listings
The Nomad system of ongoing adviser oversight
Flexible rules on company size and trading history

Listing Considerations

There is no minimum market capitalisation, but a Nomad must accept the company
Ongoing costs include the Nomad, a broker and continuing disclosure
Liquidity varies widely, and many smaller AIM companies trade infrequently
Moving up to the Main Market is possible as a company grows

Key Facts

Founded

1995

Operator

London Stock Exchange Group (LSEG)

Regulator

AIM Rules set by the London Stock Exchange; FCA for market abuse

Main Index

FTSE AIM All-Share

Currency

Pound sterling (GBP)

Trading Hours

8:00 a.m. – 4:30 p.m. UK time, Monday–Friday

Market Segments

AIM

Official website →

Listing Requirements

No minimum market capitalisation, trading record or free float
A nominated adviser (Nomad) must confirm the company is appropriate for AIM
An AIM admission document, or a prospectus if offering shares to the public above the exemption limits
A broker must be retained at all times
Companies must follow a recognised corporate governance code

Summary of the AIM Rules for Companies, checked November 2026.

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AIM (London)