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FTSE 100 Index
An index tracking the 100 publicly-traded companies listed on the London Stock Exchange with the most market capitalization. Like many other FTSE indices, it is calculated in real time, with prices updated every 15 seconds. Each quarter, the FTSE reevaluates the companies tracked on the index and makes necessary adjustments to ensure that it represents the most highly capitalized companies. The FTSE 100 Index is considered a prime indicator of health in the wider market.
See FTSE 100 Index.