The Nikkei, also known as The Nihon Keizai Shimbun (日本経済新聞; lit. "Japan Economics Newspaper"), is the flagship publication of Nikkei, Inc. (based in Tokyo) and the world's largest financial newspaper, with a daily circulation exceeding 1.73 million copies. The Nikkei 225, a stock market index for the Tokyo Stock Exchange, has been calculated by the newspaper since 1950.
It is one of the four national newspapers in Japan; the other three are The Asahi Shimbun, the Yomiuri Shimbun and the Mainichi Shimbun.