The London Stock Exchange (LSE) is a global stock exchange based in Paternoster Square in the City of London, England. Founded in 1801, it is one of the world's oldest continuously operating stock exchanges. As of July 2024, the exchange had a total market capitalisation of approximately US$3.4 trillion of listed companies. Since 2007, it has been part of the London Stock Exchange Group (LSEG), which the exchange also lists under the ticker symbol LSEG.
The LSE operates multiple equity and debt markets, including its Main Market for large companies and the Alternative Investment Market (AIM) for smaller and growth-focused firms. Despite a decline in domestic listings following Brexit, it remained Europe's most valuable stock exchange by overall listed market capitalisation as of 2023.