London remains one of the most influential financial centres in the world. It owes much of its continuing appeal to its cosmopolitan status, the liquidity of the London markets and the regulatory and political framework that supports those markets. At the end of December 2017, there were approximately 1,240 companies listed on the London Main Market with a total market capitalisation of approximately £4,413 billion and approximately 960 companies quoted on AIM (the London market for small and emerging companies) with a market capitalisation of approximately £170 billion.
Companies listed on the London Stock Exchange at 31 December 2017 (by number and value £bn)
Market capitalisation of London listed companies by industry as at 31 December 2017