FTSE 100 Explained: The UK Blue Chip Index in 2026

The FTSE 100 tracks the 100 largest companies listed on the London Stock Exchange. It ranks them by market value and weights the index toward the biggest names. In 2026 the index trades above 10,700 after first crossing 10,000 in January.

This guide explains what the index is and how it works. It covers the 2026 market story, the biggest companies, dividends, risks and ways to invest. Every figure is dated so you know what is current.

What Is the FTSE 100?

The FTSE 100 is a stock market index of the 100 largest companies on the London Stock Exchange. It measures their combined share price performance in real time. Investors treat it as the main benchmark for UK large cap shares.

FTSE stands for Financial Times Stock Exchange. The index launched on 3 January 1984 with a base level of 1,000. FTSE Russell, part of London Stock Exchange Group, maintains the index today.

People often call it the Footsie. The nickname comes from pronouncing FTSE as a single word. It is the most quoted UK market indicator in the world.

The index holds blue chip companies across many sectors. These range from energy and mining to banking, pharmaceuticals and consumer goods. A large share of member revenue comes from outside the United Kingdom.

That global reach shapes how the index behaves. A weak pound can lift the index because overseas earnings translate into more pounds. A strong pound can do the opposite. Readers who follow currency market moves will find this link useful.

FTSE 100 in 2026: Key Facts

Fact	Detail as of 30 September 2026
Current level	About 10,712, up 0.42 percent at midday on 29 September 2026
52 week range	High 10,989.45, low 9,177.09
2025 close	Near 9,931 after a 21.5 percent annual gain
Historic milestone	First traded above 10,000 on 2 January 2026
Index provider	FTSE Russell, part of London Stock Exchange Group
Review cycle	Quarterly in March, June, September and December
Trading symbol	UKX
2026 dividend forecast	Record 88.8 billion pounds, forward yield near 3.4 percent, per AJ Bell

Index levels move every second during market hours. The figures above reflect the latest reported data at the time of writing.

How the FTSE 100 Is Calculated

The index uses free float market capitalisation. That means it counts only shares available for public trading. Shares held by insiders or large strategic holders are excluded.

Step 1: Measure Each Company

Multiply the share price by the number of shares issued. Then remove shares that are not freely tradable. The result is the free float market value.

Step 2: Weight the Companies

Larger companies carry more weight in the index. Shell, AstraZeneca and HSBC therefore move the index more than smaller members. A handful of the largest members can account for about one third of the index value.

Step 3: Apply the Divisor

FTSE Russell divides the total by a fixed divisor. The divisor keeps the index continuous after corporate actions. Stock splits and new entrants do not distort the series.

Quarterly Reviews

FTSE Russell reviews membership every quarter. A company ranked 111th or lower by market value drops out. A company ranked 90th or higher can move up from the FTSE 250.

This rules based process keeps the index representative. The September 2026 review below shows it in action.

History of the FTSE 100

The Financial Times and the London Stock Exchange created the index together. It started at 1,000 points on 3 January 1984. It quickly became the headline measure of UK shares.

2026: First Time Above 10,000

UK shares began 2026 with a burst of optimism. On 2 January the index traded above 10,000 for the first time, touching 10,046 intraday. It closed above 10,000 for the first time a few days later.

That capped a remarkable 2025. The index rose 21.5 percent across 2025, its best year since 2009. It closed the year near 9,931.

Miners, defence firms and banks drove the advance. Fresnillo, BAE Systems and Rolls Royce were among the standout names. Precious metal prices and rising defence spending supported the move.

The government has also moved to steer savers toward shares. From April 2027 the annual cash ISA allowance for under 65s drops to 12,000 pounds. The change aims to lift retail participation in equities.

Major Shocks in Index History

Period	What happened
1987 crash	Global sell off hit the index hard, then it recovered
Dot com bubble 2000	The tech led rally ended in a steep decline
2008 financial crisis	Banking failures dragged the index sharply lower
Brexit vote 2016	Sterling fell, which cushioned overseas earners
2020 pandemic crash	Markets plunged, then rebounded on stimulus
2022 rate shock	Rising rates pressured valuations across markets

Top FTSE 100 Companies in 2026

Membership changes each quarter, but the heavyweights stay familiar. Energy, pharmaceuticals and banks dominate the top of the index. The table below shows selected large constituents and their sectors.

Company	Sector
Shell	Energy
AstraZeneca	Pharmaceuticals
HSBC	Banking
BP	Energy
Unilever	Consumer goods
GSK	Pharmaceuticals
Rio Tinto	Mining
Glencore	Mining
Anglo American	Mining
Lloyds Banking Group	Banking
Barclays	Banking
NatWest	Banking
National Grid	Utilities
British American Tobacco	Consumer goods
Diageo	Beverages
BAE Systems	Defence
Rolls Royce	Engineering
Tesco	Retail
RELX	Professional services
Compass Group	Catering
easyJet	Airlines, joined September 2026
Ithaca Energy	Energy, joined September 2026

Two new names joined in September 2026. easyJet and Ithaca Energy entered the index on 21 September. Entain and Persimmon moved down to the FTSE 250.

Rankings shift with share prices every day. Check the latest constituent list before acting on it.

September 2026 Quarterly Review

FTSE Russell announced the review results on 2 September 2026. easyJet and Ithaca Energy won promotion to the FTSE 100. Entain and Persimmon dropped to the FTSE 250.

The changes took effect at the start of trading on 21 September 2026. Tracker funds had to adjust their holdings by that date. Mechanical buying and selling often clusters around such dates.

Entain, the Ladbrokes owner, left after six years in the index. Its shares had fallen about 30 percent since the start of 2026. Higher UK gambling taxes weighed on its valuation.

Persimmon also lost its place after a long share price decline. Its market value had slipped to about 3.87 billion pounds. It was the second smallest member before removal.

What Moves the Index in 2026

Several forces drive the index day to day. Interest rates, inflation, commodity prices and the pound matter most. Global events add another layer.

Interest Rates

The Bank of England held its base rate at 3.75 percent on 17 September 2026. Six policymakers voted to hold and three wanted a rise to 4 percent. It was the sixth straight meeting with no change.

The last actual move was a cut from 4 percent in December 2025. Since then, rate setters have stayed cautious. Markets now debate whether the next move could be up.

Higher rates raise borrowing costs for companies. They also make cash savings more attractive next to shares. Readers can follow UK economic data for the wider picture.

Inflation

UK inflation reached 3.1 percent in the year to August 2026. That was up from 2.9 percent in July. It sits above the Bank of England 2 percent target.

Energy costs are pushing prices higher. The Bank warns inflation may rise further in coming quarters. Persistent inflation keeps pressure on rate expectations.

Commodity Prices

Energy and mining carry heavy weight in the index. Brent crude traded near 107 dollars a barrel in late September 2026. Precious metal strength lifted miners such as Fresnillo and Antofagasta.

Tensions around the Strait of Hormuz kept oil markets on edge. Supply worries support prices but threaten global growth. The index feels both sides of that trade.

The Pound

Many members earn revenue in dollars. A weaker pound boosts the sterling value of those earnings. Currency moves can matter as much as share prices.

This is why the index can rise when UK news looks bleak. Overseas earnings do the lifting. The effect works in reverse when sterling strengthens.

Global Markets

US and European trading set the tone overnight. Broader European markets today often move in step with London. On 29 September 2026 miners and pharmaceuticals led London higher.

GSK rose 2.5 percent and AstraZeneca added 1.9 percent that day. Anglo American, Antofagasta and Glencore each gained over 2 percent. Energy names lagged as oil gave back early gains.

Dividends in 2026: A Record Year in Prospect

Income is a big reason investors choose the index. Analysts at AJ Bell forecast record dividends of 88.8 billion pounds for 2026. That would beat the previous high of 85.2 billion set in 2018.

The forecast implies a forward yield of about 3.4 percent. Companies have also announced large share buybacks. Combined cash returns could approach 125 billion pounds.

That yield sits below the 10 year gilt yield of about 4.8 percent. It sits above the Bank of England base rate of 3.75 percent. Investors hunting for dividend stocks should weigh both against bond yields.

Dividends are forecasts, not promises. Companies can cut payouts if profits fall. A weaker economy would put these estimates at risk.

Ways to Invest in the FTSE 100

You cannot buy the index itself. You can buy funds that track it. Index tracker funds and ETFs copy the index at low cost.

Tracker funds. These funds mirror the index holdings. Charges are usually low and performance follows the benchmark closely.

ETFs. Exchange traded funds trade on the exchange like shares. They suit investors who want flexibility during market hours.

Individual shares. Buying the biggest members directly is possible. It takes more research and offers less diversification.

Short term trading products. Contracts for difference and spread bets multiply both gains and losses. They carry a high risk of loss and suit experienced traders only.

Many investors try to time the market. The evidence on market timing mistakes suggests patience usually wins. Learning how fund managers run portfolios can also sharpen your approach.

Benefits of FTSE 100 Investing

Diversification. One purchase spreads exposure across 100 companies and many sectors.

Liquidity. The largest UK shares trade in high volumes every day. Buying and selling is usually easy.

Dividend income. Members have a long record of paying dividends. The 2026 forecast points to a record payout year.

Stability. Large established firms tend to be steadier than smaller companies. They often survive downturns that sink weaker rivals.

Global exposure. Overseas earnings give access to world growth. This reduces dependence on the UK economy alone.

Strategies for building long term wealth often start with broad market exposure. The index fits that role for UK focused investors.

Risks of FTSE 100 Investing

Market volatility. The index can swing sharply on economic or political news. Daily moves of 1 percent or more are common.

Concentration risk. Energy, mining and financials dominate the index. Weakness in those sectors drags the whole benchmark.

Currency risk. Pound moves change the value of overseas earnings. International investors face an extra layer of swings.

Economic downturns. Recessions cut company profits and dividends. The index fell hard in 2008 and 2020.

Regulatory and political change. Tax changes, such as the 2026 gambling duty rise, can hit single sectors fast. Governments can reshape the outlook overnight.

FTSE 100 vs Other Major Indices

Index	Market	What it tracks
FTSE 100	United Kingdom	100 largest London listed companies
FTSE 250	United Kingdom	Next 250, with more domestic exposure
S&P 500	United States	500 large US companies
STOXX 600	Europe	600 companies across 17 European countries
CAC 40	France	40 largest Paris listed companies

The FTSE 250 reflects the UK domestic economy better. About three quarters of FTSE 100 revenue comes from abroad by some estimates. US indices carry far more technology weight.

European investors often compare London with the continent. Our piece on how the STOXX 600 compares covers the wider European picture.

Is the FTSE 100 a Safe Investment?

No stock market investment is fully safe. The index spreads risk across 100 large companies. That makes it steadier than single shares or smaller companies.

Still, the index can fall hard in a crisis. It dropped sharply in 2008 and again in 2020. Anyone investing should expect periods of loss.

Match the investment to your time horizon. Longer horizons have historically smoothed out downturns. Short term traders face a different risk profile.

This article is educational and not financial advice. Consider speaking with a qualified adviser before investing.

Conclusion

The FTSE 100 remains the definitive gauge of UK large cap shares. In 2026 it broke new ground above 10,000 and is set for record dividend payouts. Its global earnings base, quarterly discipline and deep liquidity explain its staying power.

Risks are real, from inflation to currency swings. Investors who understand the drivers can use the index with clearer eyes. Keep position sizes sensible and review them regularly.

Frequently Asked Questions

What is the FTSE 100?

The FTSE 100 is an index of the 100 largest companies listed on the London Stock Exchange. It tracks their combined share price performance. Investors use it as the main benchmark for UK shares.

What is the FTSE 100 at today?

The index traded around 10,712 on 29 September 2026. It moves every second during market hours. Check a live quote for the current level.

How is the FTSE 100 calculated?

It uses free float market capitalisation. Larger companies get bigger weights in the index. A divisor keeps the series continuous after corporate actions.

Which companies are in the FTSE 100?

Members include Shell, AstraZeneca, HSBC, BP and Unilever. The list is reviewed each quarter. easyJet and Ithaca Energy joined in September 2026.

What is the FTSE 100 dividend yield in 2026?

Analysts forecast a forward yield of about 3.4 percent for 2026. Total dividends could reach a record 88.8 billion pounds. These are forecasts, not guarantees.

How can I invest in the FTSE 100?

Most investors use tracker funds or ETFs. These copy the index at low cost. You can also buy individual member shares directly.

Is the FTSE 100 a good investment in 2026?

It offers diversification, liquidity and income. It also carries market, currency and concentration risk. Suitability depends on your goals and time horizon.