London Stock Exchange

The London Stock Exchange is among the world's oldest, tracing its ancestry to the seventeenth-century coffee houses of Exchange Alley, where brokers barred from the Royal Exchange for rowdiness gathered to trade shares — most famously at Jonathan's Coffee-House, where a list of stock and commodity prices called 'The Course of the Exchange' was first issued in 1698. A formal subscription-based exchange followed in 1773, and the institution grew with the British Empire into the financial centre of the nineteenth-century world, listing railways, shipping lines, and government debt from every continent.

Two modern revolutions reshaped it. The 'Big Bang' of October 1986 abolished fixed commissions, ended the separation of brokers and jobbers, and moved trading from the floor to screens overnight — transforming London into Europe's dominant financial marketplace and inviting in the global investment banks. More recently, the LSE's parent company, London Stock Exchange Group, diversified far beyond share trading, acquiring index provider FTSE Russell, clearing house LCH, and in 2021 the data giant Refinitiv, making it as much a financial information company as an exchange.

Trading on the LSE's main electronic order book, SETS (Stock Exchange Electronic Trading Service), runs from 8:00 AM to 4:30 PM London time, opening with an auction that concentrates the morning's accumulated orders into a single opening price and closing with an auction at 4:30 PM that sets the official closing prices used by index funds worldwide. A brief intraday auction near midday provides an additional liquidity point for less-traded shares.

London's clock position gives the exchange outsized global importance: its morning overlaps the final hours of Asian trading, and its afternoon overlaps the New York open — making the 2:30 PM to 4:30 PM London stretch, when both London and New York are live, one of the most liquid periods of the entire global day. The exchange also hosts extensive trading in international shares through depositary receipts, a legacy of London's role as the meeting point of global capital.

The FTSE 100 — 'Footsie' — tracks the hundred largest companies on the exchange and is the universal shorthand for the UK equity market, though its character is strikingly international: the majority of FTSE 100 revenues are earned outside the United Kingdom, in industries like energy, mining, pharmaceuticals, and global banking. The FTSE 250 mid-cap index is often considered the better barometer of the domestic British economy. Both are maintained by FTSE Russell, which the exchange group itself owns.

The LSE operates two principal markets: the Main Market, with full listing requirements, and AIM (the Alternative Investment Market), a lighter-regulation growth market launched in 1995 that has hosted thousands of smaller and earlier-stage companies. Recent years have brought intense debate about London's competitiveness as a listing venue, with UK regulators overhauling listing rules in 2024 to stem the drift of large flotations toward New York — a reminder that competition between exchanges is a live force shaping where the world's companies raise capital.