The London Stock Exchange began not with a trading floor but with lists of prices circulated among London brokers. In 1698, John Castaing posted prices for commodities and exchange rates at Jonathan’s Coffee-House in Change Alley. More than a century later, a subscription room established in 1801 formalised trading in the capital. The institution that emerged from those coffee-house networks is now based at Paternoster Square and serves companies and investors from around the world.
From Change Alley to a regulated exchange
In the late seventeenth century, stockbrokers were excluded from the Royal Exchange and conducted business in nearby establishments. Castaing’s lists helped make prices more visible, although they were initially published only on some days of the week. Trading also took place at Garraway’s coffee house, where auctions could run for as long as a length of candle burned. As securities and companies multiplied, these informal practices developed into more organised dealing.
The Royal Exchange, founded by Thomas Gresham and Richard Clough and opened by Elizabeth I in 1571, was rebuilt after the Great Fire of London and re-established in 1669. Parliament sought to regulate brokerage, including through an Act in 1697 that imposed penalties on unlicensed brokers and set a limit on their number. Restrictions encouraged some traders to do business in Change Alley instead. After trading at Jonathan’s revived, brokers formed a club in 1773 and opened a more formal stock exchange in Sweeting’s Alley.
In 1801, a subscription room became London’s first regulated exchange. The transition was disorderly: on the first trading day, a constable had to remove non-members. A new building was planned at Capel Court, where the foundation stone was laid in May and the building was completed on 30 December 1801. The Exchange adopted its first codified rule book in 1812, setting out recommendations that included procedures for settlement and default. Its organised market also helped the government raise funds for the wars against Napoleon.
Growth, disruption and a changing City
London’s exchange expanded alongside international trade. Brokers dealt in foreign securities, while exchanges opened in Manchester and Liverpool in 1836. The years of expansion also brought sharp reversals: the source account records a Spanish panic in 1835 and another two years later. By the mid-nineteenth century, the London exchange had become crowded. A larger building, designed by Thomas Allason, was completed in March 1854, doubling the available floor space. This was a new building, not the Exchange’s move to its present Paternoster Square site, which came much later.
New communications changed how the market worked. The telephone, telegraph and ticker tape helped speed the circulation of information. During the First World War, the Exchange closed from the end of July 1914 until the New Year; when it reopened, trading was restricted to cash transactions. It closed again at the start of the Second World War, reopening six days later. After a fire caused by incendiary bombs in December 1940, trading on the floor fell sharply and much business was conducted by telephone. A V-2 rocket damaged the building in 1945, but trading continued in its basement.
After the war, rising business prompted a new headquarters: the Stock Exchange Tower, opened by Queen Elizabeth II in 1972. In 1973, the London Stock Exchange merged with eleven British and Irish regional exchanges, including the Scottish Stock Exchange. The same year, restrictions that had excluded women and foreign-born members from the trading floor were abolished. The FTSE 100, created in partnership with the Financial Times, began in January 1984 as a measure tracking leading companies listed on the Exchange.
Big Bang and the move to electronic markets
The 1986 reforms known as the Big Bang changed the Exchange’s structure and trading methods. Fixed commissions were abolished, as was the distinction between stockjobbers and stockbrokers. Open outcry gave way to screen-based trading, part of a wider shift towards computerised systems and dealing rooms. The Exchange launched AIM in 1995 to give smaller, growing companies access to capital markets. Electronic services followed, including SETS and, later, the CREST settlement service.
The Exchange became a public limited company in 2000. In 2004 it moved to new headquarters at Paternoster Square, close to St Paul’s Cathedral. A 2007 merger with Borsa Italiana created the London Stock Exchange Group, while the two exchanges remained separate legal and regulatory entities. The Group later acquired Refinitiv in 2021, broadening its activities beyond operating exchange markets.
Technology has continued to reshape the business. After problems with TradElect, the Exchange announced a move to a Linux-based system; migration of the main market to MillenniumIT technology was completed in 2011. Its markets include the Main Market for established companies and AIM, which is intended for smaller businesses seeking growth capital. The Exchange also provides a venue for instruments including shares, bonds, exchange-traded funds, derivatives and global depositary receipts.
Markets, reach and pressure
The Exchange’s international role is reflected in its listings: the supplied Wikipedia account describes more than 1,900 companies from over 60 countries. It identifies the FTSE 100, FTSE 250, FTSE 350 and other indices among the measures associated with the market. The Main Market includes large international companies, while AIM offers smaller and earlier-stage businesses a route to public investment. This range links London’s historic financial district with firms seeking capital across different sectors and stages of growth.
The Exchange has also faced challenges and changes of ownership. Its building was bombed by the Provisional IRA in 1990 after a warning prompted an evacuation; nobody was injured. The visitor gallery later closed permanently as electronic trading reduced the appeal of the trading floor to visitors. In 2007, the NASDAQ bid for the Exchange failed after shareholders rejected it. The Group’s proposed merger with Toronto’s TMX Group was terminated in 2011 after it became clear that the necessary shareholder approval would not be secured.
Its work has extended into questions of environmental finance. In 2019, it introduced the Green Economy Mark for companies deriving at least half their revenue from environmental or sustainable products and services. The Exchange has also suspended trading in particular securities in response to international events: in 2022 it suspended trading in Russian firms’ global depositary receipts following Russia’s invasion of Ukraine. These examples show a marketplace whose rules and activities operate within a broader political and economic landscape.
Why London Stock Exchange deserves a place in British Legacy
The London Stock Exchange deserves a place in British Legacy because its history records how Britain’s financial markets developed from informal networks into an organised institution. Castaing’s seventeenth-century price lists, the subscription room of 1801 and the rule book of 1812 mark distinct stages in that change. The Exchange also helped the government raise funds during the wars against Napoleon, while its later mergers brought regional British and Irish exchanges into a wider national market. These are not simply milestones in the history of one company: they show the changing relationship between finance, regulation and public life in Britain.
Its legacy is also visible in the practical routes it provides for companies to seek investment. The Main Market and AIM serve firms with different profiles, while the FTSE indices give investors widely used measures of listed companies. The Big Bang reforms and the move to screen-based trading demonstrate how radically the institution has changed its methods rather than relying on its historic status. Its international listings and later Group expansion connect London to global capital, but its Paternoster Square headquarters, institutional history and role in the development of British markets keep that global reach rooted in the City. Remembering the Exchange means recognising both the opportunities created by organised capital and the need for markets to adapt to new technology, regulation and economic pressures.
Sources
Adapted in part from London Stock Exchange by Wikipedia contributors, under CC BY-SA 4.0. Text has been edited and combined with the existing article; this adapted text is shared under the same licence. Contributor history.