This article needs additional citations for
. (October 2017)
The Nikkei 225 (日経平均株価 Nikkei heikin kabuka, 日経225), more commonly called the Nikkei, the Nikkei index, or the Nikkei Stock Average
 (/, /, or /), is a
stock market index for the
Tokyo Stock Exchange (TSE). It has been calculated daily by the
Nihon Keizai Shinbun (The Nikkei) newspaper since
1950. It is a
price-weighted index, operating in the
Japanese Yen (JP¥), and its 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. Indeed, it was known as the 'Nikkei Dow Jones Stock Average' from
The Nikkei 225 began to be calculated on 7 September 19501949. Since January
2010, the index is updated every 15 seconds during trading sessions.
, retroactively calculated back to 16 May
The Nikkei 225 Futures, introduced at
Singapore Exchange (SGX) in
Osaka Securities Exchange (OSE) in
Chicago Mercantile Exchange (CME) in
1990, is now an internationally recognised
The Nikkei average has deviated sharply from the textbook model of stock averages, which grow at a steady exponential rate. The average hit its all-time high on 29 December 1989, during the peak of the
Japanese asset price bubble, when it reached an intra-day high of 38,957.44, before closing at 38,915.87, having grown sixfold during the decade. Subsequently, it lost nearly all these gains, closing at 7,054.98 on 10 March 2009 — 81.9% below its peak twenty years earlier.
Another major index for the Tokyo Stock Exchange is the
Tokyo Stock Price Index (TOPIX).
On 15 March
2011, the second working day after the
massive earthquake in the northeast part of Japan, the index dropped over 10% to finish at 8605.15, a loss of 1,015 points. The index continued to drop throughout 2011, eventually bottoming out at 8160.01 on 25 November, putting it at its lowest close since 10 March 2009. The Nikkei fell over 17% in 2011, finishing the year at 8455.35, its lowest year-end closing value in nearly thirty years, when the index finished at 8016.70 in
The Nikkei started
2013 near 10,600, hitting a peak of 15,942 in May. However, shortly afterward, it plunged by almost 10% before rebounding, making it the most volatile
stock market index among the
developed markets. By
2015, it has reached over 20,000 mark; marking a gain of over 10,000 in two years, making it one of the fastest growing stock market indexes in the world.