What is the FTSE 250? A complete guide to the UK’s mid-cap index

The FTSE 250 represents what analysts call the “mid-cap” segment of the London Stock Exchange. These are generally established businesses, but their share prices can still be volatile and investors can lose money. They tend to generate more of their revenue within the UK compared to their larger counterparts. That domestic tilt makes the index a useful barometer for the UK economy’s health.

What does FTSE stand for?

FTSE stands for Financial Times Stock Exchange. The name reflects the index’s origins as a joint venture between the Financial Times newspaper and the London Stock Exchange, which launched the original FTSE 100 Index in January 1984.

Today, FTSE Russell, a subsidiary of the London Stock Exchange Group, manages the entire family of FTSE UK indices. The organisation sets the rules for index construction, conducts quarterly reviews and publishes the methodology that determines which companies qualify for each index tier.

The term “Footsie” emerged as a nickname for the FTSE indices, though professionals typically use the full abbreviation or simply refer to specific index names.

Defining the FTSE 250 index

The FTSE 250 index comprises the 101st to 350th largest companies listed on the London Stock Exchange, ranked by market capitalisation. Think of it as the layer immediately beneath the FTSE 100, capturing mid-sized businesses that have grown beyond small-cap status but have not yet reached the scale of the UK’s corporate giants.

Market capitalisation, the total value of a company’s outstanding shares, determines inclusion. To qualify, a company must also meet FTSE Russell’s eligibility requirements around liquidity, free float and nationality.

Capital at risk. The value of investments can go down as well as up, and you may get back less than you invest. This applies to index funds, exchange-traded funds and individual shares within the FTSE 250.

Which companies are in the FTSE 250?

The FTSE 250 companies list changes quarterly as businesses grow, shrink or restructure. Rather than household names with global operations, you will find companies that often dominate specific sectors or serve primarily UK customers.

Typical constituents include regional housebuilders, specialist retailers, mid-sized investment trusts, UK-focused banks and industrial firms. Some names will be familiar from high streets or business parks. Others operate in niche sectors where they hold strong market positions despite limited public recognition.

The composition shifts as companies graduate to the FTSE 100 following sustained share price growth or drop down from the top tier after market capitalisation declines.

How is the FTSE 250 calculated?

The FTSE 250 uses a market capitalisation-weighted methodology. Larger companies within the index carry more influence over its daily movements than smaller constituents.

Here is how the weighting works in practice:

Free-float adjustment matters because it excludes shares held by governments, founders or strategic investors who are unlikely to sell. This adjustment ensures the index reflects shares actually available for trading.

The index value you see quoted represents a single number derived from these weighted calculations, updated in real time during market hours.

FTSE 250 vs FTSE 100: Key differences

The distinction between the FTSE 100 and FTSE 250 goes beyond simple size rankings. Each index behaves differently and serves different analytical purposes.

The FTSE 100 includes multinational corporations that earn most of their revenue overseas. When sterling weakens, these companies often benefit because their foreign earnings translate into more pounds. The FTSE 250, by contrast, tends to move more closely with UK economic data, interest rate expectations and domestic consumer confidence.

This difference explains why the two indices can diverge sharply. A strong pound might pressure FTSE 100 earnings while supporting FTSE 250 companies that import materials or sell to UK customers.

How the FTSE 250 fits into the FTSE 350 and FTSE All-Share

The FTSE 350 combines the FTSE 100 and FTSE 250 into a single index covering the UK’s 350 largest listed companies. This broader measure captures both the international giants and the domestically focused mid-caps within one benchmark.

The FTSE All-Share extends further, adding the FTSE SmallCap index to create the most comprehensive measure of UK equity market performance. Fund managers benchmarked against the All-Share must consider holdings across all three tiers.

For practical analysis, the FTSE 350 often serves as the dividing line between institutional-grade investments and smaller, less liquid companies.

How companies enter or leave the FTSE 250

FTSE Russell conducts quarterly reviews in March, June, September and December to determine index membership. The process follows strict rules designed to prevent excessive churn while reflecting genuine changes in company size.

Promotion and relegation operate through a buffer system rather than hard cut-offs:

This buffer system means a company at rank 105 will not automatically drop out of the FTSE 100. It would need to fall below 110 before relegation occurs. The approach reduces index turnover caused by temporary share price fluctuations.

Changes announced after each quarterly review take effect on the third Friday of the review month. Index fund managers must then adjust their portfolios to match the new composition, which can create short-term trading activity around affected stocks.

Sectors represented in the FTSE 250

The list of FTSE 250 companies by sector reveals a different industrial profile compared to the FTSE 100. Certain sectors dominate the mid-cap space while others barely feature.

Prominent FTSE 250 sectors include:

• Investment trusts and closed-end funds, which often have substantial market capitalisations

• Real estate investment trusts and property companies

• Support services and business-to-business providers

• Retailers focused on UK consumers

• Housebuilders and construction materials firms

• Travel and leisure businesses

• Mid-sized financial services companies

Underrepresented sectors include integrated oil majors, global pharmaceutical companies and large-scale mining operations. These industries require massive capital investment and tend to produce either very large or very small listed companies, with few occupying the mid-cap range.

The sector composition helps explain why the FTSE 250 often responds differently to economic news than the FTSE 100. Property valuations, UK consumer spending and domestic interest rates carry more weight in the mid-cap index.

What causes the FTSE 250 to rise or fall?

When observers ask why the FTSE 250 is falling today, or rising, the answer typically involves some combination of macroeconomic factors and sector-specific developments.

Key influences on FTSE 250 performance include:

The FTSE 250 today reflects all these inputs, aggregated through the share prices of its 250 constituents. On any given day, one factor may dominate. Over longer periods, fundamental earnings growth and economic conditions drive returns.

Because the index tilts domestic, UK political developments and fiscal policy changes often affect the FTSE 250 more visibly than the FTSE 100. Budget announcements, regulatory changes and planning policy can move specific sectors substantially.

How can investors access the FTSE 250?

This is general information, not investment advice or a personal recommendation.

Several methods exist for gaining exposure to the FTSE 250, each with different characteristics, costs and risk profiles.

Exchange-traded funds that track the FTSE 250 offer straightforward access through a single holding. These funds aim to replicate index performance before fees, which typically range from modest to very low.

Index tracker funds from major investment managers provide similar exposure through traditional fund structures rather than exchange-traded products.

Investment trusts that focus on UK mid-caps offer actively managed alternatives, though these do not guarantee index-matching performance and may trade at premiums or discounts to their underlying asset values.

Direct share ownership allows investors to construct their own FTSE 250 exposure, though replicating a 250-stock index requires significant capital and generates higher dealing costs.

Each approach involves trade-offs between cost, convenience, tracking accuracy and active management potential. The value of all these investments can fall as well as rise, and past performance provides no guarantee of future results.

Key takeaways

Understanding the FTSE 250 index provides insight into a segment of the UK market that receives less attention than the FTSE 100 but arguably tells us more about domestic economic conditions.

Core points to remember:

• The FTSE 250 comprises companies ranked 101 to 350 by market capitalisation on the London Stock Exchange.

• FTSE stands for Financial Times Stock Exchange, reflecting the index family’s historical origins.

• Market capitalisation weighting means larger mid-caps influence index movements more than smaller constituents.

• The index combines with the FTSE 100 to form the FTSE 350.

• Quarterly reviews determine which companies enter or leave, with buffer thresholds preventing excessive churn.

• Domestic economic factors affect the FTSE 250 more than the internationally oriented FTSE 100.

• Investment trusts, property companies and UK-focused businesses feature prominently.

• Access is available through ETFs, index funds or direct share purchases.

The FTSE 250 offers a different perspective on UK capitalism than the more famous FTSE 100. Neither index is inherently superior. They measure different things and respond to different forces. Understanding both provides a more complete picture of UK equity markets.