Nikkei 225 is a stock market index for the Tokyo Stock Exchange(TSE). It has been calculated daily by the Nihon Keizai Shimbun (Nikkei) newspaper since 1950. It is a price-weighted average (the unit is yen), and the components are reviewed once a year. Currently, the Nikkei is the most widely quoted average of Japanese equities, similar to the Dow Jones Industrial Average. In fact, it was known as the "Nikkei Dow Jones Stock Average" from 1975 to 1985.The Nikkei 225 began to be calculated on September 7, 1950, retroactively calculated back to May 16, 1949.The Nikkei 225 Futures, introduced at Singapore Exchange (SGX) in 1986, the Osaka Securities Exchange (OSE) in 1988, Chicago Mercantile Exchange (CME) in 1990, is now an internationally recognized futures index. The Nikkei average hit its all-time high on December 29, 1989 when it reached an intra-day high of 38,957.44 before closing at 38,915.87. Its high for the 21st century stands just above 18,300 points. Another major index for the Tokyo Stock Exchange is the Topix..Stocks are weighted on the Nikkei 225 by giving an equal weighting based on a par value of 50 yen per share. Events such as stock splits, removals and additions of constituents impact upon the effective weighting of individual stocks and the divisor. The Nikkei 225 is designed to reflect the overall market, so there is no specific weighting of industries.Stocks are reviewed annually and announcements of review results are made in September. Changes, if required, are made at the beginning of October. Changes may also take place at any time if a stock is found to be ineligible for the Stock Average. All proposed changes will be announced in Nikkei's Japanese newspapers and will appear on NNI. After a stock has been replaced, the divisor is reviewed and modified to ensure a smooth transition of the stock index. Le Nikkei 225 est le principal indice boursier de la bourse de Tōkyō. Le terme Nikkei est l'abréviation de « Nihon Keizai Shinbun », le nom du quotidien économique qui publie cet indice. Il est composé de 225 sociétés. Le Nikkei a été créé le 16 mai 1949 (année de la base 100). Le Nikkei 225 se calcule par une moyenne arithmétique des valeurs qui le compose, sans pondération par la capitalisation boursière des titres qui le composent. Cet indice se trouvait à près de 40 000 points à la fin 1989 et à 15 000 en 1992, suite à l'explosion de la bulle financière. Entre 2000 et 2003, il a accentué sa chute pour atteindre un plus bas de vingt ans. À la faveur du retour en grâce de l'économie nipponne après une stagnation longue d'une décennie, l'indice a repris du terrain, clôturant fin 2005 à plus de 16 000 points, à la suite des seconds semestres 2004 et 2005 qui ont été le théâtre de rallyes boursiers particulièrement marqués.
http://www.nni.nikkei.co.jp/e/fr/tnks/marketlive.aspxhttp://www.wikinvest.com/wiki/Nikkei_225http://www.stock-trkr.co.uk/indices/nikkei_225_live_chart
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