The FTSE 100 is a market-capitalisation weighted index of UK-listed blue chip companies. The index is part of the FTSE UK Series and is designed to measure the performance of the 100 largest companies traded on the London Stock Exchange that pass screening for size and liquidity.
The indexes within the FTSE UK Index Series — the FTSE All-Share®, FTSE 100, FTSE 250 and other indexes — have served as a measure of the UK’s stock market and as a gauge of the health of the country’s economy for decades.
Index rules should be read in conjunction with supportingFTSE Russell noticesThese notices advise of advance changes in index methodology, which may not be reflected in index rules until the change effective date. The notices may also communicate revisions in index treatment in the period up to a rule change.