Historical Futures Prices: SGX Nikkei 225 Index Futures, March 2016 (NKH2016), March 2016. The Nikkei 225, commonly called the Nikkei index or the Nikkei Stock Average, is a stock market index for the Tokyo Stock Exchange (TSE). It has been calculated daily by the Nikkei Digital Inc 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. Minimum Price Fluctuation: Outright: 5 index points (¥2500). Strategy Trades: 1 index point (¥500). Final Settlement Price: The final settlement price shall be the Special Nikkei 225 Index Quotation based on the opening prices of each component issue in the Nikkei 225 Index on the business day following the last trading day.