FTSE 100 vs FTSE 250

This guide explains what each index represents, how companies qualify for inclusion, and the practical differences in sector composition and geographic revenue exposure. The aim is straightforward: to give you a clear foundation for understanding both benchmarks without steering you towards one or the other.

What does FTSE stand for?

FTSE stands for Financial Times Stock Exchange. The name reflects the index’s origins as a partnership between the Financial Times newspaper and the London Stock Exchange, established in 1984. Today, FTSE Russell, a subsidiary of the London Stock Exchange Group, maintains and calculates these indices.

The numbers following FTSE – 100, 250 or 350 – refer to the count of companies included in each index. So when someone asks what does FTSE 100 stand for, the answer is simply the 100 largest companies by market capitalisation listed on the London Stock Exchange.

What is the FTSE 100?

The FTSE 100 tracks the 100 largest companies listed on the London Stock Exchange, ranked by market capitalisation. It serves as the primary benchmark for UK equities and receives significant attention from domestic and international investors alike. Inclusion is based on FTSE Russell rules (including free-float and eligibility criteria), not market cap alone.

Composition and market cap requirements

To enter the FTSE 100, a company must rank among the 90 largest by market capitalisation at the quarterly review. To exit, it must fall below the 111th position. This buffer zone prevents excessive churn from minor fluctuations in share prices.

The index uses a free-float methodology, meaning only shares available for public trading count towards the market cap calculation. Shares held by founders, governments or other strategic holders are excluded. This approach aims to reflect actual investable opportunity rather than total company value.

FTSE 100 companies tend to be well-established businesses with market capitalisations often exceeding £5bn, though the threshold fluctuates based on overall market conditions.

Sector breakdown and international revenue exposure

The FTSE 100 has a distinctive sector profile. Financials, energy, healthcare and consumer staples carry substantial weightings. Mining companies and multinational oil majors feature prominently, which creates sensitivity to commodity price movements.

A critical characteristic often surprises newer investors: FTSE 100 companies generate a significant portion of their revenues outside the UK. Major constituents operate globally, with exposure to dollar-denominated earnings. This international tilt means the FTSE 100 does not purely reflect UK economic health.

Currency movements matter here. When sterling weakens against the dollar, the translated value of foreign earnings rises, which can support FTSE 100 share prices even during domestic economic difficulties.

What is the FTSE 250?

The FTSE 250 comprises the next 250 companies by market capitalisation after the FTSE 100. Think of it as the second tier of UK-listed companies – still substantial businesses, but smaller than the mega-caps dominating the main index.

Composition and how companies qualify

Qualification follows similar rules to the FTSE 100. A company enters the FTSE 250 if it rises into the top 325 positions at the quarterly review. It exits if it falls below the 376th position. Companies can also move up into the FTSE 100 or down into smaller-cap indices.

FTSE 250 companies typically have market capitalisations ranging from several hundred million pounds to several billion. The exact boundaries shift with market conditions.

Domestic focus and sector characteristics

The FTSE 250 companies list includes a broader array of sectors compared to its larger sibling. Investment trusts, real estate companies and industrial firms appear more frequently. Retail, leisure and housebuilding companies also feature prominently.

Crucially, FTSE 250 constituents tend to derive a higher proportion of their revenues from the UK domestic economy. This creates a different risk and return profile. When the UK economy grows, these companies may benefit more directly. Conversely, domestic downturns can hit them harder.

The domestic focus also means less natural hedging against sterling weakness. A falling pound typically does not provide the same earnings translation benefit that larger international companies receive.

FTSE 100 vs FTSE 250: Key differences compared

Company size and market capitalisation

The most obvious difference lies in scale. FTSE 100 companies are larger, more liquid and often household names. FTSE 250 companies, while still sizeable by any reasonable measure, operate at a different scale.

Geographic revenue exposure

This difference deserves emphasis. The FTSE 100’s international revenue exposure means it often moves differently from the UK economy. A strong US economy and weak pound can sometimes support FTSE 100 returns even during UK recessions, though relationships are not consistent and outcomes vary.

The FTSE 250, by contrast, provides more direct exposure to UK economic conditions. Property developers, domestic retailers and regionally focused industrial companies tie their fortunes more closely to UK consumer spending, housing markets and business investment.

Volatility considerations

Mid-cap companies generally exhibit higher volatility than large-caps. Smaller market capitalisation means less trading liquidity and potentially wider bid-ask spreads. News events can move individual FTSE 250 shares more dramatically.

However, the FTSE 100’s commodity and financial sector exposure creates its own volatility. Oil price swings or banking sector concerns can cause sharp index movements.

Neither index is consistently more or less volatile; they can experience different types of volatility driven by different factors.

What is the FTSE 350?

The FTSE 350 combines both indices, encompassing the 350 largest companies by market capitalisation on the London Stock Exchange. It offers a broader view of UK-listed equities than either index alone.

Fund managers sometimes use the FTSE 350 as a benchmark when they want exposure across the market cap spectrum. It captures both the international flavour of the largest companies and the domestic character of mid-caps.

The combined index naturally carries characteristics of both components, though the FTSE 100 companies dominate by weighting due to their larger market capitalisations.

Historical performance: Context and considerations

Examining historical returns provides context but requires careful interpretation. Over various time periods, the FTSE 100 and FTSE 250 have performed differently based on prevailing economic conditions, interest rates and sector trends.

During periods of UK economic expansion, the FTSE 250 has at times delivered stronger returns, benefiting from its domestic exposure. During global growth phases with sterling weakness, the FTSE 100 has sometimes outperformed.

The FTSE 100 average return over five years or any other period varies substantially depending on the start and end dates chosen. Selecting different measurement windows can produce markedly different conclusions.

Index returns are typically shown before fees and costs and are not directly investable.

Past performance is not a reliable indicator of future results

This point warrants its own section because it matters enormously. Historical returns tell you what happened, not what will happen. Economic conditions change, sector compositions evolve and individual companies enter and exit indices.

Any investment decision based solely on past performance assumes the future will resemble the past – an assumption that frequently proves incorrect. Both indices carry risk of capital loss, and neither offers guaranteed returns.

Investors considering exposure to either index should understand their own financial circumstances and risk tolerance. This article provides educational information, not personal investment advice.

How do these indices compare to global benchmarks?

FTSE 100 vs S&P 500: A brief comparison

The FTSE 100 vs S&P 500 comparison highlights important structural differences. Both serve as flagship indices for their respective markets, but their compositions differ substantially.

The S&P 500 carries significantly higher technology sector exposure, which has driven much of its performance in recent years. The FTSE 100’s heavier weighting towards energy, materials and financials creates different return characteristics.

Neither composition is inherently superior – they simply provide exposure to different economic activities and growth drivers.

Factors that may influence each index differently

Several factors affect the FTSE 100 and FTSE 250 in distinct ways:

• Interest rates: The FTSE 250’s domestic exposure means UK interest rate changes may have a more direct impact. Housebuilders, retailers and domestically focused financials respond to Bank of England policy. The FTSE 100’s international companies care more about global rate environments.

• Currency movements: Sterling depreciation tends to support FTSE 100 earnings through translation effects. The FTSE 250 receives less benefit and may suffer if currency weakness drives import price inflation that hurts domestic consumers.

• UK economic growth: Domestic GDP growth correlates more closely with FTSE 250 performance. The FTSE 100 can diverge from UK economic trends when global conditions differ.

• Commodity prices: Energy and mining companies in the FTSE 100 create sensitivity to oil, gas and industrial metal prices. The FTSE 250 has less direct commodity exposure.

• Sector-specific developments: Banking regulation affects FTSE 100 financials. Property market changes affect FTSE 250 real estate companies and housebuilders.

Understanding these relationships helps explain why the two indices can move in different directions despite both representing UK-listed companies.

Summary: Understanding both indices

The FTSE 100 companies list represents the UK’s largest listed businesses, many operating globally with significant non-UK revenue. The FTSE 250 captures the next tier, featuring more domestically oriented companies across diverse sectors.

Key takeaways

• The FTSE 100 comprises the 100 largest companies by market capitalisation, while the FTSE 250 includes the next 250.

• FTSE 100 constituents typically have greater international revenue exposure.

• FTSE 250 companies tend to be more sensitive to UK economic conditions.

• The FTSE 350 combines both indices into a broader market benchmark.

• Each index responds differently to interest rates, currency movements and economic cycles.

• Historical performance varies by time period and provides no guarantee of future returns.

Both indices serve legitimate purposes within the UK equity market structure. Understanding their characteristics helps you interpret financial news and market commentary more effectively. Neither is objectively better – they simply offer exposure to different segments of the listed company universe.

This information is provided for educational purposes only. It does not constitute personal investment advice. Investment in equities involves risk, including the possibility of losing some or all of your capital. Consider seeking independent financial advice before making investment decisions.