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The Alternative Investment Market (AIM) is a sub-market of the London Stock Exchange, allowing smaller companies to float shares with a more flexible regulatory system than is applicable to the Main Market. The AIM was launched in 1995 and has raised almost £24 billion for more than 2,200 companies. Flexibility is provided by less regulation and no requirements for capitalisation or number of shares issued. Some companies have since moved on to join the Main Market, although in the last few years, significantly more companies transferred from the Main Market to the AIM (The AIM has significant tax advantages for investors, as well as less regulatory burden for the companies themselves). In 2005, 40 companies moved directly from the Main Market to the AIM, while only two companies moved from the AIM to the Main Market.

The AIM has also started to become an international exchange, often due to its low-regulatory burden, especially in relation to the Sarbanes-Oxley Act (though only a quarter of AIM-listed companies would qualify to list on a U.S. stock exchange even prior to passage of the Sarbanes-Oxley Act). As of December 2005 over 270 foreign companies had been admitted to the Alternative Investment Market.

The independent FTSE Group maintains three indices for measuring the AIM, which are the FTSE AIM UK 50 Index, FTSE AIM 100 Index, and FTSE AIM All-Share Index.

AIM's regulatory model

AIM is an exchange regulated venue featuring an array of principles-based rules for publicly held companies. AIM’s regulatory model is based on a comply-or-explain option that lets companies that are floated on AIM either comply with AIMs relatively few rules, or explain why it has decided not to comply with them.

Nominated Advisers (Nomads)

Aside from granting leeway in regards to regulatory compliance, the Exchange also mandates continuous oversight and advice by the issuer's underwriter, referred to as a Nominated Adviser (Nomad). The role of Nomads is central to AIM’s regulatory model, as these entities play the role of gatekeepers, advisers and regulators of AIM companies. In advising each firm as to which rules should be complied with and the manner in which existing requirements should be met, Nomads provide the essential service of allowing firms to abide by tailor-made regulation, reducing regulatory costs in the process. Theoretically, Nomads are liable for damages from tolerating misdemeanors on behalf of their supervised companies, including the loss of reputational capital. However, this heavy reliance on Nomads has been criticized as creating a conflict of interest, since Nomads receive fees from the companies they purportedly supervise while, in practice, managing to avoid liability for market misconduct.

In 2006, the London Stock Exchange launched a review of Nomad activities, resulting in a regulatory "handbook" for Nomads published by the Financial Services Authority in 2007.


Because AIM is an exchange regulated market segment, it escapes most of the mandatory provisions contained in European Union directives - as implemented in the UK - and other rules applicable to companies listed in the LSE. AIM believes self-regulation is pivotal to AIM’s low regulatory burden: companies seeking an AIM listing are not subject to significant admission requirements; after admission is granted, firms must comply with ongoing obligations which are comparatively lower to the ones that govern the operation of larger exchanges; and certain corporate governance provisions are not mandatory for AIM companies. AIM-listed companies usually are only required to adhere to the corporate governance requirements of their home jurisdiction, which, as a practical matter, vary widely.

Investor base

Another important element of AIM’s model is the composition of its investor base. Although AIM-listed companies are not start-ups, most are small and highly risky. This may prove to be hazardous for unsophisticated investors who lack both the knowledge and resources to conduct proper inquiries into a firm’s prospects and activities, or even larger investors which lack strong internal control and risk management requirements. As a consequence, AIM’s investor base is largely composed of institutional investors and wealthy individuals.

Market capitalisation

The following table lists the 10 biggest AIM companies on 28 February 2009.

Rank Company MarketCap (£M GBP)
1 Lancashire Hldgs 883
2 Playtech 851
3 Sibir Energy 675
4 Peter Hambro Mining 467
5 Centamin Egypt 448
6 Globe Specialty Metals Inc. 403
7 Green Dragon Gas Ltd. 373
8 Omega Insurance Hldgs Ltd. 360
9 Booker Group Plc. 339
10 Climate Exchage 329
Source: File linked from this page.


"Casino" environment

In March 2007, U.S. securities regulator Roel Campos suggested that AIM's rules for share trading have created a market like a "casino". Campos reportedly said: "I'm concerned that 30% of issuers that list on AIM are gone in a year. That feels like a casino to me and I believe that investors will treat it as such.". The comment resulted in several angry retorts, including one from the LSE, which controls AIM, pointing out that the number of companies that go into liquidation or administration in a year is actually fewer than 2%.

AIM has since issued new rules requiring that listed companies maintain a website .

Langbar International Limited Fraud

AIM has come under additional criticism for allowing Langbar International to be listed. At £375 million ($750m) Langbar is the biggest share fraud on the Exchange to date. It is presently being investigated by the Serious Fraud Office and the City of London Police. It was discovered in November 2005, that Langbar had none of the assets it declared at listing and this was due in part to the failure of the Nomad (Nominated Adviser) to carry out Due Diligence and the Exchange failing to ensure that the AIM rules had been complied with. After the fraud was uncovered, the AIM changed the rules for Nomads in 2006 and on 19 October 2007 they fined Nabarro Wells £250,000 ($512,500) "Historic Currency Conversion" 19 October 2007, and publicly censured them for breaches of the AIM rules.


In March 2007 the Daily Telegraph noticed a tendency to use listing vehicles incorporated in Offshore Financial Centres prior to floating on AIM. Some 35% of the companies floated on AIM during 2006 were from OFCs, of which the majority came from the Channel Islands or the British Virgin Islandsmarker.

On 29 January, 2009 it was announced that AIM is to form the basis of an Asian-orientated growth or incubator market called 'Tokyo AIM', which will be run as a joint venture between the Tokyo Stock Exchange and LSEmarker. Tokyo AIM will replicate AIM's system of oversight by NOMADs, with 'J-Nomads' being "selected and approved by TOKYO AIM ... to assess companies’ suitability for the market".


See also

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