United Kingdom's main stock market index, the GB100, fell to 9636 points on October 27, 2025, losing 0.10% from the previous session. Over the past month, the index has climbed 3.62% and is up 16.30% compared to the same time last year, according to trading on a contract for difference (CFD) that tracks this benchmark index from United Kingdom. United Kingdom Stock Market Index (GB100) - values, historical data, forecasts and news - updated on October of 2025.

Between the first quarter of 2007 and the fourth quarter of 2024, the lowest market capitalization of all companies listed on the London Stock Exchange (LSE) was recorded in the first quarter of 2009, at *** trillion British pounds. As of the fourth quarter of 2024, the market capitalization of the entire LSE amounted to *** trillion British pounds. Although the value of companies trading has fluctuated and increased overall, a downward trend can be seen in the number of companies listed on the LSE.

Graph and download economic data for Financial Market: Share Prices for United Kingdom (SPASTT01GBM661N) from Dec 1957 to Sep 2025 about stock market and United Kingdom.

Largest UK companies by market cap

The largest UK companies by market cap are those listed on the UK stock exchange with the highest total value of all shares, representing their perceived worth by investors. These companies, such as BP, Shell, Unilever, HSBC Holdings, and GlaxoSmithKline, are considered some of the most valuable and powerful in the country, with a significant impact on the global economy. AstraZeneca, Rio Tinto, and Reckitt Benckiser are also notable high-market cap companies in the UK, reflecting their strong foothold in their respective markets.

As of February 2025, British holding bank HSBC Holdings Plc was the leading finance company listed on the London Stock Exchange (LSE) with a total market capitalization of almost 166 billion British pounds. Second in the ranking was Spanish bank Banco Santander S.A., with a market cap of nearly 77.7 billion U.S. dollars.

As of May 2025, the pharmaceutical company AstraZeneca was the leading company listed on the London Exchange (LSE), with a market capitalization of 159 billion British pounds. This made them the largest of all companies listed on the LSE. Seen as the heart of the global financial community, the London Stock Exchange is the second-largest stock market in Europe and ranks eighth globally. Key information The London Stock Exchange (LSE) is among the largest stock market operators globally and ranks 11th in terms of the oldest stock exchanges in existence, with 224 years of operation as of 2025. Performance after Covid The COVID-19 pandemic had a profound effect on the global economy, causing considerable volatility on the stock market. The London Stock Exchange (LSE) saw a notable decline in the market capitalization value of its listed companies, reaching its lowest value in March 2020 at approximately three trillion British pounds in correlation with a surge in the average daily number of trades, which peaked at over two billion. Following this initial reaction, the LSE observed a decrease in the average daily active traders, alongside a gradual recovery in the market capitalization of the listed companies.

Stock market return (%, year-on-year) in United Kingdom was reported at 14.38 % in 2021, according to the World Bank collection of development indicators, compiled from officially recognized sources. United Kingdom - Stock market return (%, year-on-year) - actual values, historical data, forecasts and projections were sourced from the World Bank on October of 2025.

London Stock Exchange stock price, live market quote, shares value, historical data, intraday chart, earnings per share and news.

Graph and download economic data for Stock Market Capitalization to GDP for United Kingdom (DDDM01GBA156NWDB) from 1975 to 2014 about market cap, stock market, capital, United Kingdom, and GDP.

United Kingdom UK: Stocks Traded: Total Value data was reported at 2,357.017 USD bn in 2014. This records an increase from the previous number of 1,675.053 USD bn for 2013. United Kingdom UK: Stocks Traded: Total Value data is updated yearly, averaging 487.920 USD bn from Dec 1975 (Median) to 2014, with 40 observations. The data reached an all-time high of 3,947.700 USD bn in 2007 and a record low of 19.361 USD bn in 1977. United Kingdom UK: Stocks Traded: Total Value data remains active status in CEIC and is reported by World Bank. The data is categorized under Global Database’s United Kingdom – Table UK.World Bank.WDI: Financial Sector. The value of shares traded is the total number of shares traded, both domestic and foreign, multiplied by their respective matching prices. Figures are single counted (only one side of the transaction is considered). Companies admitted to listing and admitted to trading are included in the data. Data are end of year values converted to U.S. dollars using corresponding year-end foreign exchange rates.; ; World Federation of Exchanges database.; Sum; Stock market data were previously sourced from Standard & Poor's until they discontinued their 'Global Stock Markets Factbook' and database in April 2013. Time series have been replaced in December 2015 with data from the World Federation of Exchanges and may differ from the previous S&P definitions and methodology.

Key information about United Kingdom Market Capitalization

• United Kingdom Market Capitalization accounted for 3,182.091 USD bn in Feb 2025, compared with a percentage of 3,120.628 USD bn in the previous month
• UK Market Capitalization is updated monthly, available from Apr 1999 to Feb 2025
• The data reached an all-time high of 4,211.587 USD bn in Oct 2007 and a record low of 1,402.869 USD bn in Sep 2002

CEIC converts monthly Market Capitalization into USD. London Stock Exchange provides Market Capitalization in local currency. The Federal Reserve Board period end market exchange rate is used for currency conversions. Market capitalization includes only domestically listed companies. As of 2017, definitions from the revised Markets in Financial Instruments Directive (MiFID II) have been introduced.

As of February 2025, Unilever Plc was the leading company among consumer staples companies on the London Stock Exchange in terms of its market capitalization, with a total value of over 111 billion British pounds. This was followed by British American Tobacco Plc and Diageo PLC, with values of over 68 billion and 48 billion British pounds, respectively.

London Stock Exchange reported GBP52.41B in Market Capitalization this October of 2025, considering the latest stock price and the number of outstanding shares.Data for London Stock Exchange | LSE - Market Capitalization including historical, tables and charts were last updated by Trading Economics this last October in 2025.

The United Kingdom: Stock market turnover ratio: The latest value from 2022 is 36.32 percent, an increase from 22.48 percent in 2021. In comparison, the world average is 33.38 percent, based on data from 74 countries. Historically, the average for the United Kingdom from 1975 to 2022 is 52.65 percent. The minimum value, 15.17 percent, was reached in 1978 while the maximum of 146.43 percent was recorded in 2008.

United Kingdom Turnover: Volume: AIM: Total data was reported at 133,953,298.006 Unit th in Mar 2025. This records an increase from the previous number of 101,747,335.128 Unit th for Feb 2025. United Kingdom Turnover: Volume: AIM: Total data is updated monthly, averaging 31,651,339.929 Unit th from Jan 2006 (Median) to Mar 2025, with 231 observations. The data reached an all-time high of 173,519,534.744 Unit th in Jul 2024 and a record low of 7,173,058.808 Unit th in Aug 2010. United Kingdom Turnover: Volume: AIM: Total data remains active status in CEIC and is reported by London Stock Exchange. The data is categorized under Global Database’s United Kingdom – Table UK.Z008: London Stock Exchange: Turnover: AIM Market.

The United Kingdom: Stock market capitalization, billion USD: The latest value from 2022 is 3095.98 billion U.S. dollars, a decline from 3799.46 billion U.S. dollars in 2021. In comparison, the world average is 1225.97 billion U.S. dollars, based on data from 75 countries. Historically, the average for the United Kingdom from 1975 to 2022 is 1673.7 billion U.S. dollars. The minimum value, 30.1 billion U.S. dollars, was reached in 1979 while the maximum of 3946.88 billion U.S. dollars was recorded in 2013.

United Kingdom Market Capitalisation: AIM: Basic Materials data was reported at 5,260.048 GBP mn in Oct 2018. This records a decrease from the previous number of 5,688.683 GBP mn for Sep 2018. United Kingdom Market Capitalisation: AIM: Basic Materials data is updated monthly, averaging 7,985.973 GBP mn from Jan 2006 (Median) to Oct 2018, with 154 observations. The data reached an all-time high of 20,688.600 GBP mn in Mar 2007 and a record low of 3,683.827 GBP mn in Jan 2016. United Kingdom Market Capitalisation: AIM: Basic Materials data remains active status in CEIC and is reported by London Stock Exchange. The data is categorized under Global Database’s United Kingdom – Table UK.Z006: London Stock Exchange: Market Capitalisation: AIM Market.

Graph and download economic data for Financial Market: Share Prices for United Kingdom (SPASTT01GBQ661N) from Q1 1958 to Q3 2025 about stock market and United Kingdom.

Key information about United Kingdom Market Capitalization: % of GDP

• United Kingdom Market Capitalization accounted for 83.8 % of its Nominal GDP in Dec 2024, compared with a percentage of 70.5 % in the previous year
• UK Market Capitalization: % Nominal GDP is updated yearly, available from Dec 1999 to Dec 2024
• The data reached an all-time high of 131.2 % in Dec 2006 and a record low of 70.5 % in Dec 2023

CEIC calculates annual Market Capitalization as % of Nominal GDP from monthly Market Capitalization and quarterly Nominal GDP. London Stock Exchange provides Market Capitalization in local currency. The Office for National Statistics provides Nominal GDP in local currency. As of 2017, definitions from the revised Markets in Financial Instruments Directive (MiFID II) have been introduced. Market Capitalization includes domestically listed companies only.


Further information about United Kingdom Market Capitalization: % of GDP

• In the latest reports, FTSE All-Share recorded a daily P/E ratio of 14.4 in Jul 2022
• FTSE 100 closed at 8,674.0 points in Jan 2025

Stock and commodity exchanges can benefit from various sources of revenue, ranging from fees charged through the purchasing and selling of stocks and commodities to the listing of companies on exchanges with IPOs. Yet, this hasn't meant exchanges have been free of challenges, with many companies looking to more attractive overseas markets in countries like the US that embrace stronger growth. The most notable culprits have been ARM and CRH, refusing to put up with the increasingly cheaper valuations offered by UK stock exchanges.Stock and commodity exchange revenue is expected to boom at a compound annual rate of 13% over the five years through 2025-26 to £18 billion, including growth of 5.2% in 2025-26. Boosted by the London Stock Exchange Group's Refinitiv purchase in 2021-22, the growth numbers seem inflated. The industry saw ample consolidations, aided by MiFID II's initiation in 2018. However, M&As have slumped over recent years as a result of high borrowing costs and a foggy economic outlook. Interest rate cuts and growing confidence are set to facilitate a modest recovery over the two years through 2025, driving revenue growth and supporting profit of 25.7% in 2025-26. Exchanges have also capitalised on volatile markets, with nervous investors triggering sharp sell-offs amid a tense geopolitical backdrop with Trump’s tariff policies. Consolidation amongst the largest players has been frequent, ratcheting up market share concentration. This will also prompt smaller exchanges to target niche markets and potentially band together in networks or alliances to pool liquidity and strengthen bargaining power. Revenue is forecast to climb at a compound annual rate of 4.7% over the five years through 2030-31 to £22.7 billion. Over the short term, sticky inflation and how aggressively the Bank of England cuts rates will incite volatility and fuel trading on exchanges, driving revenue growth. Geopolitical tensions also show no signs of cooling, with the potential for matters to even escalate, keeping markets edgy and increasing the likelihood of large market swings. The use of blockchain will become more prevalent, with major player, the London Stock Exchange Group, already introducing a blockchain-based infrastructure platform for private markets. These exchanges allow for 24/7 trading, lower settlement times, and often lower fees, which can attract retail and institutional participants, driving fee income.