The Professional Securities Market (PSM) and Specialist Fund Market (SFM) account for around 60 companies, with a total market cap of about £6.5 billion.
The Main Market is solely for established high-performance companies and has strict listing requirements. Over 1,300 of the LSE's company listings trade on the Main Market with a total market cap of nearly £4 trillion.
The Alternative Investment Market on the other hand trades in small-caps, or new enterprises with high growth potential. Nearly 1,100 companies are listed on the AIM, with a total market cap of over £63 billion.