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FTSE 100 Index

FTSE 100 Index
FTSE 100 index chart since 1984.png
FTSE 100 Index performance between 1984 and 2015
Foundation 1984
Operator FTSE Group
Constituents 101
Type Large cap
Market cap £1.7 trillion
(as of Sept 2016)
Weighting method Capitalization-weighted
Related indices
Website www.ftse.com

The Financial Times Stock Exchange 100 Index, also called the FTSE 100 Index, FTSE 100, FTSE, or, informally, the "Footsie" /ˈfʊtsi/, is a of the 100 companies listed on the with the highest market capitalization. It is seen as a gauge of prosperity for businesses regulated by UK company law. The index is maintained by the FTSE Group, a subsidiary of the .

The index began on 3 January 1984 at the base level of 1000. The highest intra-day value (7,354) was reached on 16 January 2017. The highest closing value (7,337) was reached on 13 January 2017. The previous peaks having been over 17 years previously, on the last trading day of 1999, during the dot-com bubble, and in April 2015, when the Index reached 7103.98. After falling during the financial crisis of 2007-2010 to below 3500 in March 2009, the index recovered to a peak of 6091.33 on 8 February 2011, to under the 5000 mark on the morning of 23 September 2011, but reached its record high on the morning of 16 January 2017.

The index is maintained by the FTSE Group, a now wholly owned subsidiary of the which originated as a joint venture between the Financial Times and the London Stock Exchange. It is calculated in real time and published every second when the market is open.

The FTSE 100 consists of the largest 100 qualifying UK companies by full market value. A large slice of these are international companies, however, so the index's movements are a fairly weak indicator of how the UK economy is faring. A better indication of the UK economy is the FTSE 250 as it contains a smaller proportion of international companies. The constituents of the FTSE are determined quarterly, on the Wednesday after the first Friday of the month in March, June, September and December. The values used to make the changes to the indices are taken at the close of business the night before the review.


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