The FTSE 100 receives the bulk of UK retail attention, yet the FTSE 250, SmallCap and AIM markets contain hundreds of companies trading at lower valuations and offering different sector exposures.

Key takeaways

  • The FTSE 250 represents the UK's mid-cap segment.
  • Small caps have historically outperformed large caps over long horizons - with higher Volatility.
  • Valuation metrics (P/E, P/B, EV/EBITDA) help screen for ideas.
  • Liquidity falls sharply outside the FTSE 350.
  • ISA eligibility extends to most LSE Main Market and many AIM stocks (HMRC).

Why look beyond the top 100?

Mid- and small-caps often offer higher growth and lower analyst coverage, which can mean Mispricing.

How to screen

Free tools from major platforms and Stockopedia allow filtering by valuation, growth and quality factors.

Sector pockets to watch

UK industrials, specialty finance and biotech have included multiple multi-bagger stories in past cycles.

What this means for UK investors

Smaller companies can complement a core global-tracker portfolio for long-horizon UK investors comfortable with extra volatility.

Risks to watch

  • Lower liquidity and wider bid-offer spreads.
  • Funding rounds diluting existing shareholders.
  • Sentiment swings driven by small flows.
  • Survivorship bias in 'gem' stories.