The Financial Times Stock Exchange 100 Index (FTSE 100 or 'Footsie') represents the 100 largest companies by market capitalisation on the London Stock Exchange. It is the benchmark for UK equities and a proxy for the health of the British economy, though many constituents earn the majority of their revenue internationally.
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100 largest companies on the LSE by market cap: Shell, AstraZeneca, HSBC, Unilever, BP, Rio Tinto, Diageo, and GSK among others.
Regular session: 08:00–16:30 GMT (Mon–Fri). Closing auction until 16:35 GMT.
Launched on 3 January 1984 with a base value of 1,000. Free-float market-cap weighted. Reviewed quarterly by FTSE Russell.