London Stock Exchange

Wikipedia contributors · CC BY-SA · EN · 04/10/2026

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 the 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, representing roughly 13% of the global mining market.

Despite challenges following Brexit, the LSE regained its position as Europe's largest stock market by total market value in 2024 and 2025, bolstered by a record-breaking performance in its flagship FTSE 100 index, which surpassed the 10,000-point milestone for the first time in early 2026.

History

Coffee House

The Royal Exchange was founded by the English financier Thomas Gresham and Sir Richard Clough on the model of the Stock Exchange in Antwerp. It was opened by Queen Elizabeth I in 1571.

In the 17th century, stockbrokers were not allowed in the Royal Exchange due to their perceived rude manners. They had to operate from other establishments in the vicinity, notably Jonathan's Coffee-House. At that coffee house, a broker named John Castaing started listing the prices of a few commodities including salt, coal, paper, and exchange rates in 1698. Originally, this was not a daily list and was only published a few days of the week.

This list and activity was later moved to Garraway's coffee house. Public auctions during this period were conducted for the duration that a length of tallow candle could burn. These were known as "by inch of candle" auctions. As stocks grew, with new companies joining to raise capital, the royal court also raised some monies. These are the earliest evidence of organised trading in marketable securities in London.

Royal Exchange

After Gresham's Royal Exchange building was destroyed in the Great Fire of London, it was rebuilt and re-established in 1669. This was a move away from coffee houses and a step towards the modern model of stock exchange.

The Royal Exchange housed brokers, merchants and merchandise. This was the birth of a regulated stock market, which had teething problems in the shape of unlicensed brokers. In order to regulate these, Parliament passed an Act in 1697 that levied heavy penalties, both financial and physical, on those brokering without a licence. It set a fixed number of brokers, at 100, but this was later increased as the size of the trade grew.

This limit led to several problems, one of which was that traders began leaving the Royal Exchange, either by their own decision or through expulsion, and started dealing in the streets of London. The street in which they were now dealing was known as 'Exchange Alley', or 'Change Alley'; it was suitably placed close to the Bank of England. Parliament tried to regulate this and ban the unofficial traders from the Change streets.

Traders became weary of "bubbles" when companies rose quickly and fell, so they persuaded Parliament to pass a clause preventing "unchartered" companies from forming.

After the Seven Years' War (1756–1763), trade at Jonathan's Coffee House boomed again. In 1773, Jonathan, together with 150 other brokers, formed a club and opened a new and more formal "Stock Exchange" in Sweeting's Alley. This now had a set entrance fee, by which traders could enter the stock room and trade securities. It was not an exclusive location for trading, as trading also occurred in the Rotunda of the Bank of England. Fraud was also rife during these times and in order to deter such dealings, it was suggested that users of the stock room pay an increased fee. This was not met well and ultimately, the solution came in the form of annual fees and turning the Exchange into a Subscription room.

The Subscription room created in 1801 was the first regulated exchange in London, but the transformation was not welcomed by all parties. On the first day of trading, non-members had to be expelled by a constable. In spite of the disorder, a new and bigger building was planned at Capel Court.

William Hammond laid the first foundation stone for the new building on 18 May. It was finished on 30 December when "The Stock Exchange" was incised on the entrance.

First Rule Book

In the Exchange's first operating years, on several occasions there was no clear set of regulations or fundamental laws for the Capel Court trading. In February 1812, the General Purpose Committee confirmed a set of recommendations, which later became the foundation of the first codified rule book of the Exchange. Even though the document was not a complex one, topics such as settlement and default were, in fact, quite comprehensive.

With its new governmental commandments and increasing trading volume, the Exchange was progressively becoming an accepted part of the financial life in the city. In spite of continuous criticism from newspapers and the public, the government used the Exchange's organised market (and would most likely not have managed without it) to raise the enormous amount of money required for the wars against Napoleon.

Foreign and regional exchanges

After the war and facing a booming world economy, foreign lending to countries such as Brazil, Peru and Chile was a growing market. Notably, the Foreign Market at the Exchange allowed for merchants and traders to participate, and the Royal Exchange hosted all transactions where foreign parties were involved. The constant increase in overseas business eventually meant that dealing in foreign securities had to be allowed within all of the Exchange's premises.

Just as London enjoyed growth through international trade, the rest of Great Britain also benefited from the economic boom. Two other cities in particular showed great business development: Liverpool and Manchester. In 1836, both the Manchester and Liverpool stock exchanges were opened. Some stock prices sometimes rose by 10%, 20% or even 30% in a week. These were times when stockbroking was considered a real business profession, and such attracted many entrepreneurs. With booms came busts, and in 1835 the "Spanish panic" hit the markets, followed by a second one two years later.

The Exchange before the World Wars

By June 1853, both participating members and brokers were taking up so much space that the Exchange was now uncomfortably crowded, and continual expansion plans were taking place. Having already been extended west, east, and northwards, it was decided that the Exchange needed an entire new establishment. Thomas Allason was appointed as the main architect. In March 1854, the new brick building inspired by the Great Exhibition stood ready. This was a huge improvement in both surroundings and space, with twice the floor space available.

By the late 1800s, the telephone, ticker tape, and the telegraph had been invented. Those new technologies led to a revolution in the work of the Exchange.

First World War

As the financial centre of the world, both the City and the Stock Exchange were hit hard by the outbreak of World War I in 1914. Prices surged at first, due to fears that borrowed money was to be called in and that foreign banks would demand their loans or raise interest. The decision to close the Exchange for improved breathing space and to extend the August Bank Holiday to prohibit a run on banks, was hurried through by the committee and Parliament, respectively. The Stock Exchange ended up being closed from the end of July until the New Year, causing street business to be introduced again, as well as the "challenge system".

The Exchange was set to open again on 4 January 1915 under tedious restrictions: transactions were to be in cash only. Due to the limitations and challenges on trading brought by the war, almost a thousand members quit the Exchange between 1914 and 1918. When peace returned in November 1918, the mood on the trading floor was generally cowed. In 1923, the Exchange received its own coat of arms, with the motto Dictum Meum Pactum, My Word is My Bond.

Second World War

In 1937, officials at the Exchange used their experiences from World War I to draw up plans for how to handle a new war. The main concerns included air raids and the bombing of the Exchange's perimeters. One suggestion was a move to Denham, Buckinghamshire. This never took place. On the first day of September 1939, the Exchange closed its doors "until further notice" and two days later World War II was declared. The Exchange opened its doors again six days later, on 7 September.

As the war escalated into its second year, the concerns for air raids were greater than ever. On the night of 29 December 1940, one of the greatest fires in London's history took place. The Exchange's floor was hit by a clutch of incendiary bombs, which were extinguished quickly. Trading on the floor was now drastically low and most was done over the phone to reduce the possibility of injuries.

The Exchange was only closed for one more day during wartime, in 1945 due to damage from a V-2 rocket. Trading continued in the house's basement.

Post-war

After decades of uncertain if not turbulent times, stock market business boomed in the late 1950s. This spurred multiple officials to find new, more suitable accommodation. In 1967, work on the new Stock Exchange Tower began. The Exchange's new 321 ft high building had 26 storeys with council and administration at the top, and middle floors let out to affiliate companies. Queen Elizabeth II opened the building on 8 November 1972. It was a new City landmark, with its 23,000 sqft trading floor.

1973 marked a year of changes for the Stock Exchange. First, two trading prohibitions were abolished. A report from the Monopolies and Mergers Commission recommended the admittance of both women and foreign-born members on the floor. Second, in March the London Stock Exchange formally merged with the eleven British and Irish regional exchanges, including the Scottish Stock Exchange.

This expansion led to the creation of a new position of chief executive officer; after an extensive search this post was given to Robert Fell. There were more governance changes in 1991, when the governing Council of the Exchange was replaced by a board of directors drawn from the Exchange's executive, customer, and user base; and the trading name became "The London Stock Exchange".

The FTSE 100 Index (pronounced "Footsie 100") was launched by a partnership of the Financial Times and the Stock Exchange on 3 January 1984. This turned out to be one of the most useful indices of all, and tracked the movements of the 100 leading companies listed on the Exchange.

IRA bombing

On 20 July 1990, a bomb planted by the Provisional Irish Republican Army (IRA) exploded in the men's toilets behind the visitors' gallery. The area had already been evacuated and nobody was injured. About 30 minutes before the blast at 8:49 a.m., a man who said he was a member of the IRA told Reuters that a bomb had been placed at the exchange and was about to explode. Police officials said that if there had been no warning, the human toll would have been very high. The explosion ripped a hole in the 23-storey building in Threadneedle Street and sent a shower of glass and concrete onto the street. The long-term trend towards electronic trading platforms reduced the Exchange's attraction to visitors, and although the gallery reopened, it was closed permanently in 1992.

"Big Bang"

The biggest event of the 1980s was the sudden de-regulation of the financial markets in the UK in 1986. The phrase "Big Bang" was coined to describe measures, including abolition of fixed commission charges and of the distinction between stockjobbers and stockbrokers on the London Stock Exchange, as well as the change from an open outcry to electronic, screen-based trading.

In 1995, the Exchange launched the Alternative Investment Market, the AIM, to allow growing companies to expand into international markets. Two years later, the Electronic Trading Service (SETS) was launched, bringing greater speed and efficiency to the market. Next, the CREST settlement service was launched.

21st century

In 2000, the LSE's shareholders voted to become a public limited company, London Stock Exchange plc. The LSE also transferred its role as the United Kingdom's listing authority to the Financial Services Authority.

EDX London, an international equity derivatives business, was created in 2003 in partnership with OM Group. The Exchange also acquired Proquote Limited, a new generation supplier of real-time market data and trading systems.

The old Stock Exchange Tower became largely redundant with Big Bang, which deregulated many of the LSE's activities: computerised systems and dealing rooms replaced face-to-face trading. In 2004, the LSE moved to a brand-new headquarters in Paternoster Square, close to St Paul's Cathedral.

In 2007, the LSE merged with Borsa Italiana, creating London Stock Exchange Group (LSEG). The Group's headquarters are in Paternoster Square.

Source and attribution

Adapted from “London Stock Exchange” by English Wikipedia contributors. Main paragraphs and sections are retained; tables, reference markers and technical markup are omitted. This is an encyclopedic adaptation, not a personal review. Original revision and contributor history ↗. Text is shared under CC BY-SA 4.0 ↗. Check current visitor access, tickets and transport with the relevant operator.