what is the nikkei 
the nikkei is short for japan s nikkei 225 stock average the leading and most respected index of japanese stocks it is a price weighted index composed of japan s top 225 blue chip companies traded on the tokyo stock exchange the nikkei is equivalent to the dow jones industrial average djia index in the united states understanding the nikkeiformerly called the nikkei dow jones stock average from 1975 to 1985 it is now named after the nihon keizai shimbun or japan economic newspaper commonly known as nikkei which sponsors the calculation of the index the index has been calculated since september 1950 retroactive to may 1949 among the best known companies included in the nikkei index are canon incorporated sony corporation and toyota motor corporation it is the oldest stock index in asia the nikkei was established as part of the rebuilding and industrialization of japan in the aftermath of the second world war constituent stocks are ranked by share price rather than by market capitalization as is common in most indexes valuations are denominated in japanese yen the composition of the nikkei is reviewed every september and any needed changes take place in october according to the nikkei 225 stock average fact sheet the nikkei 225 is calculated every 5 seconds while the tokyo stock exchange is open the tokyo stock exchange and the nikkei indexthe tokyo stock exchange tse was established in 1878 initially the tse was founded as a marketplace for the exchange of bonds the government had issued to samurai in addition to government bonds the tse also acted as an exchange for gold and silver currencies by the 1920s the tse grew to include stock trading in 1943 during the second world war the japanese government combined the tse with five others to form a single japanese stock exchange that exchange was closed down in aug 1945 toward the end of the war the tokyo stock exchange re opened on may 16 1949 under the aegis of the securities exchange act japan experienced a major asset bubble in the late 1980s when the government used fiscal and monetary stimuli to counteract a recession caused by the japanese yen s 50 appreciation during the first part of the decade stock prices and land values tripled between 1985 and 1989 at the height of the bubble the tse accounted for 60 of global stock market capitalization the bubble burst in 1990 and the value of the nikkei index fell by one third that year in oct 2008 the nikkei traded below 7 000 this was a decline of more than 80 from its dec 1989 high it subsequently rebounded between june 2012 and june 2015 with the help of economic stimulus from the japanese government and the bank of japan but the index was still nearly 50 below the 1989 high topix vs nikkeithe tokyo price index frequently referred to as topix is another widely followed index on the tokyo stock exchange while the nikkei is an index of 225 selected stocks from the tse the topix is an index that includes all the stocks in the tse the nikkei is price weighted which means the index is an average of the share prices of all the companies listed because each company s stock is weighted by its price per share the nikkei tends to be influenced by high priced stocks such as technology stocks topix on the other hand uses the capitalization weighted method for all the stocks in the tse s first section topix is affected by stocks with large market valuations such as financials special considerationsit is not possible to directly purchase an index but there are several exchange traded funds etfs whose components correlate to the nikkei etfs that track the nikkei and trade on the tokyo stock exchange include blackrock s ishares nikkei 225 and nomura asset management nikkei 225 exchange traded fund the maxis nikkei 225 index etf is a dollar denominated fund that trades on the new york stock exchange 