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Company rankings

We are often asked for a list of the top UK companies. There are different organisations ranking companies using different methods. Here’s a quick guide to the well known top companies rankings.

FTSE 100
The largest 100 companies on the London Stock Exchange (LSE). This is calculated by market capitalisation ie the number of shares in existence multiplied by the current price of those shares.

FTSE 250
The next 250 biggest companies on the LSE.

FTSE 350
The FTSE 100 and FTSE 250 combined.

FTSE SmallCap
Medium-sized companies on the LSE - those not big enough for the FTSE 350.

FTSE Fledging
Small companies on the LSE - those too small to be included on the SmallCap.

FTSE All-Share
This comprises the FTSE 100, FTSE 250 and FTSE SmallCap.

FTSE All-Small
FTSE SmallCap plus FTSE Fledgling.

FTSE 500
This does not exist, although people often mention it.

AIM
AIM is the Alternative Investment Market. This is not connected to the FTSE but is a separate trading market for shares in small companies.

Sunday Times Top Track 250 companies
The Sunday Times Grant Thornton Top Track 250 league table ranks Britain's mid-market growth private companies with the biggest sales.

Fortune 500 companies
The Fortune 500 is an annual list compiled and published by Fortune magazine that ranks the top 500 U.S. closely held and public corporations as ranked by their gross revenue after adjustments made by Fortune to exclude the impact of excise taxes companies incur.