AIM was created eight years ago as a smaller companies market, to provide young and growing businesses with a means of raising capital and experiencing a public market in their securities. AIM now represents a third of all British quoted companies. More recently, the London Stock Exchange has been marketing AIM as a global market for emerging companies.

There are more than 720 companies trading on AIM with a total market capitalisation of more than £10bn and individual market capitalisations ranging from less than £2m to more than £550m. Of these, 55 are overseas companies, which have a combined market capitalisation in excess of £1.2bn.