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 mid-2025, the exchange had a total market capitalisation of approximately US$5.9 trillion for all listed instruments. Since 2007, it has been operated by London Stock Exchange Group (LSEG), which is itself a constituent of the FTSE 100 Index and trades under the ticker symbol LSEG.

The exchange hosts over 1,900 companies from more than 60 countries, operating several key equity and debt markets, including its Main Market for established global companies and the Alternative Investment Market (AIM) for smaller, high-growth firms. It also serves as a primary venue for Global Depositary Receipts (GDRs), providing a critical gateway for firms from emerging markets—particularly India, China, and the Middle East—to access international capital. The exchange is a global center for the Natural Resources sector; as of 2025, London maintains the world’s largest concentration of mining capital, with a sectoral market capitalization of approximately US$600 billion.

London Stock Exchange Group plc (LSEG) is a British global provider of financial markets data and infrastructure headquartered in London, England. It owns the London Stock Exchange (on which it is also listed), Refinitiv, LSEG Technology, FTSE Russell, and majority stakes in LCH and Tradeweb.