From Traderpedia

Definition: The most widely watched stock index in Japan.

The Nikkei 225 is owned by the Nihon Keizai Shimbun ("Nikkei") newspaper.

[edit] History

It dates back to 1949, when it was known as the Nikkei-Dow Index.

[edit] Calculation

Its is a price-weighted index, calculated as the summation of the values of 225 blue chip companies listed listed on the Tokyo Stock Exchange, divided by a numerical divisor. Therefore it is similar to that of the Dow Jones Industrial Average - upon which it was originally modelled.