London Stock Exchange Listed Companies: Complete UK List 2026

London Stock Exchange listed companies are businesses whose shares or other eligible securities are admitted to trading on markets operated by the London Stock Exchange.

The largest and most established businesses generally trade on the Main Market, while AIM provides a public market for smaller, growing and entrepreneurial companies.

The FTSE 100 is often confused with the London Stock Exchange itself. However, the FTSE 100 contains only 100 large eligible companies.

The wider London market contains hundreds of companies, investment companies and international issuers across the Main Market and AIM.

As of  September 2026, the FTSE 100 still contains Entain and Persimmon. EasyJet and Ithaca Energy have been confirmed as their replacements, but those changes do not take effect until trading begins on 21 September 2026.

Last Updated: 16.09.2026

How Many Companies Are Listed on the London Stock Exchange in 2026?

There is no single number that should be used for every reference to London Stock Exchange listed companies because official market statistics distinguish between companies, issuers, securities and individual trading instruments.

For example, Financial Conduct Authority data for March 2026 recorded 1,739 issuers with securities on the Official List, alongside 14,911 admitted securities.

Within that figure were 522 equity commercial companies. Those numbers should not be interpreted as meaning there are 1,739 ordinary share companies on the London Stock Exchange because the Official List also covers other types of securities.

The London Stock Exchange separately publishes Main Market and AIM month-end statistics and maintains issuer and instrument lists.

Its market reports make clear that investors should distinguish an issuer from an instrument, since one organisation can have several securities available on the exchange.

At the end of 2025, the Main Market contained 925 companies, including 669 domestic and 256 international companies. The figure changes as businesses complete IPOs, transfer between markets, merge, are acquired or cancel their listings.

For anyone searching for a current company, checking its individual market status is therefore more reliable than relying on a single annual headline total.

What Counts as a London Stock Exchange Listed Company?

A business can be publicly traded in London without belonging to the FTSE 100. The market on which it trades and its regulatory status are separate from its inclusion in a stock market index.

Main Market Companies

The Main Market is the London Stock Exchange’s principal regulated market. It contains many of Britain’s largest publicly traded businesses as well as investment companies and international issuers.

Following the UK’s listing reforms, older references to companies simply holding a Premium or Standard Listing can be outdated. Current FCA categories include classifications such as Equity Shares in Commercial Companies and Closed-Ended Investment Funds.

Large Main Market companies include HSBC, Shell, AstraZeneca, Rolls-Royce, Barclays, BP, Unilever and National Grid.

AIM Companies

AIM is operated by the London Stock Exchange but is structured for growing and entrepreneurial companies.

An AIM company is not automatically part of the FTSE 100, FTSE 250 or FTSE All-Share. AIM has its own index family, including the FTSE AIM All-Share and FTSE AIM 100.

AIM rules were also significantly revised in August 2026, including changes intended to simplify admissions, capital raising and certain corporate transactions.

This means older descriptions of AIM requirements may no longer accurately reflect the current market framework.

Complete List Of FTSE 100 London Stock Exchange Listed Companies In September 2026

The table below gives the complete FTSE 100 membership as of 16 September 2026. It is important to date the list because FTSE Russell has already announced another rebalance that will become effective on 21 September 2026.

The FTSE 100 currently has 100 constituents, and membership is reviewed in March, June, September and December.

Complete FTSE 100 Companies List In September 2026

Note: This table reflects FTSE 100 membership as of  September 2026. Sector labels are broad categories designed to make the list easier to understand, while Business Focus summarises each company’s principal activity.

FTSE 100 membership can change following quarterly reviews and corporate events.

What Are The Largest London Stock Exchange Listed Companies By Market Capitalisation?

Market capitalisation measures the approximate stock market value of a company’s issued shares. Because share prices move throughout each trading session, rankings can change even when index membership remains unchanged.

In September 2026, HSBC, Shell and AstraZeneca remain among the largest London-listed businesses.

Recent LSE market data placed HSBC’s market capitalisation at around £266 billion, Shell at roughly £203 billion and AstraZeneca at around £182 billion. Rolls-Royce was around £119 billion, while Unilever was close to £100 billion.

These figures are snapshots rather than fixed values. A company’s valuation changes with its share price, share issuance, buybacks and corporate actions.

Which Companies Joined Or Left The FTSE 100 In 2026?

The FTSE 100 has undergone several important changes during 2026.

The March review brought IG Group Holdings and Lion Finance Group into the FTSE 100, while EasyJet and Hikma Pharmaceuticals moved out. Those changes took effect on 23 March 2026.

The June annual review produced another three changes. Aberdeen Group, Computacenter and Investec entered the FTSE 100, replacing Berkeley Group Holdings, Mondi and Rightmove.

The September review has already been confirmed, although its changes are not effective on 16 September.

The September changes will be implemented after the close on 18 September 2026 and take effect when trading begins on 21 September 2026. From that date, EasyJet and Ithaca Energy will appear in the FTSE 100 while Entain and Persimmon will move to the FTSE 250.

This is why any article presenting a London Stock Exchange company list should include a clear date rather than simply calling the information a 2026 list.

Which Sectors Have The Most London Stock Exchange Listed Companies?

London’s public equity market covers far more than banking and energy. The exchange includes businesses from healthcare, mining, retail, insurance, property, aerospace, technology, telecommunications and consumer industries.

The sector mix also helps explain why movements in individual industries can have a noticeable effect on the FTSE 100. Large banks, oil companies, miners and pharmaceutical businesses account for substantial portions of the index.

What Is The Difference Between The Main Market, AIM, FTSE 100 And FTSE 250?

These terms are often treated as though they mean the same thing, but they describe different parts of London’s capital markets.

FTSE Russell states that the FTSE 350 combines the FTSE 100 and FTSE 250, while the FTSE All-Share brings together the FTSE 100, FTSE 250 and FTSE SmallCap. The FTSE All-Share represents roughly 98% to 99% of UK market capitalisation.

AIM is different because it is a market, not simply another level of the FTSE 100 hierarchy.

Are All London Stock Exchange Listed Companies Based In The UK?

No. The London Stock Exchange includes both UK and international companies, with many businesses generating a large share of their revenue overseas.

Companies such as Airtel Africa, Coca-Cola HBC, Endeavour Mining, International Consolidated Airlines Group and Prudential demonstrate the international nature of the FTSE 100.

This means London-listed companies do not always reflect conditions in the UK economy alone.

From the June 2026 review, both UK and non-UK incorporated companies can qualify for FTSE inclusion with a minimum 10% free float, provided they meet the other eligibility requirements.

How Can You Read And Verify An LSE Company Listing?

An LSE company page provides more than a share price. The ticker identifies the traded security, such as HSBA for HSBC Holdings or LSEG for London Stock Exchange Group.

Many UK share prices are shown in GBX, meaning pence sterling. For example, 1,500 GBX equals £15.

Listings may also show market capitalisation, ISIN, SEDOL, market, trading service and FCA listing category.

Because company names, listings and index membership can change, investors should check the latest company and ticker information before relying on older data.

How Does A Company Become Listed On The London Stock Exchange?

The process depends on whether a company is joining the Main Market or AIM.

Main Market applicants generally prepare financial information, governance arrangements, corporate structures and disclosure documents.

They may also need a prospectus explaining the company’s operations, finances, risks, management and use of raised capital.

AIM follows a different framework and usually requires a nominated adviser, known as a Nomad. Its admission requirements were updated in August 2026.

After admission, listed companies must continue meeting relevant disclosure, governance and market requirements rather than treating listing as a one-off process.

How Can Investors Research London Stock Exchange Listed Companies?

A ticker and share price alone do not provide enough information to evaluate a listed business.

Company size, revenue, profitability, debt, cash flow, dividends and valuation can all affect how investors assess a share. Sector conditions are also important because a bank faces different risks from a mining business, retailer or pharmaceutical company.

Index membership can provide useful context, but being in the FTSE 100 does not automatically mean a company represents a suitable investment.

FTSE membership primarily reflects eligibility and market-capitalisation rules rather than a judgement that one business is financially stronger than another.

Market capitalisation should also be considered alongside company fundamentals. A rapidly rising share price can increase a company’s market value without an equivalent rise in its revenue or profits.

For business researchers, LSE listings can also provide useful information about ownership, acquisitions, dividend policies, corporate strategy and major market announcements.

Conclusion

London Stock Exchange listed companies span a much wider market than the FTSE 100. The Main Market contains established UK and international businesses, while AIM provides access to a large range of growth companies.

The FTSE 100 nevertheless remains the most visible group of London-listed businesses and changes regularly as market values move.

As of 16 September 2026, Entain and Persimmon remain constituents, although EasyJet and Ithaca Energy are confirmed to replace them from 21 September 2026.

For that reason, company lists should always be date-stamped. Investors and businesses should also distinguish between an exchange, a market, an issuer, a security and an index rather than treating every London-listed company as a FTSE 100 business.

Frequently Asked Questions

How Many Companies Are Listed On The London Stock Exchange?

The figure depends on whether the count refers to issuers, ordinary equity companies, investment companies or individual securities.

The wider London market contains hundreds of equity issuers across the Main Market and AIM, while the FTSE 100 contains only 100 constituent companies.

Are All LSE Companies Part Of The FTSE 100?

No. The FTSE 100 contains only 100 highly capitalised companies that satisfy its eligibility rules. Many other companies trade on the Main Market, FTSE 250, FTSE SmallCap and AIM.

What Is The Largest Company Listed On The London Stock Exchange?

Market values constantly change. In September 2026, HSBC is among the largest London-listed companies, with LSE data showing a market capitalisation of roughly £266 billion around 10 September. Shell and AstraZeneca are also among the largest.

What Is The Difference Between AIM And The Main Market?

Both are operated by the London Stock Exchange, but they serve different parts of the public market.

The Main Market is the principal regulated market, while AIM is designed around growth and entrepreneurial companies under its own admission and continuing rules.

Can International Companies List On The London Stock Exchange?

Yes. London includes numerous companies with international incorporation, operations or revenue. A company does not have to generate most of its sales in the UK simply because its shares trade in London.

How Often Does The FTSE 100 List Change?

Scheduled FTSE 100 reviews take place quarterly in March, June, September and December. Companies may also be affected between reviews by takeovers, mergers and other corporate events.

Can A Company Be Removed From The London Stock Exchange?

Yes. Trading or listing can end following a takeover, merger, restructuring, move to another market, insolvency or voluntary cancellation.

Leaving the FTSE 100 does not necessarily mean leaving the London Stock Exchange because a company can simply move into the FTSE 250.