The most important FTSE indices and their constituents are:
FTSE 100: The 100 largest UK listed companies, covering about 80% of UK market cap
FTSE 250: The next 250 largest companies
FTSE 350: A combination of the above two: about 90% of total UK market cap
FTSE Techmark indices: three indices that cover London listed technology companies.
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FTSE Eurotrack: a family of indices at cover European markets as a whole.