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In the UK the Financial Times Stock Exchange 100 (FTSE 100), for example, comprises the 100 largest companies listed on the London Stock Exchange. The index rises and falls according to the share-price performance of the 100 companies listed on it. It is assessed every three months, and if companies' shares have underperformed they may fall out of the index and be replaced by another. Two or three drop out of the FTSE 100 every quarter. Companies currently in the FTSE 100 include Sky, Burberry, easyJet, ITV, Next, GlaxoSmithKline, Taylor Wimpey and Royal Mail.