The Topix Stock Price Index is a Japanese stock market index that tracks the performance of all companies listed on the Tokyo Stock Exchange's First Section. It is calculated and published by the Tokyo Stock Exchange (TSE). The Topix index is a capitalization-weighted index, meaning that the companies with the highest market capitalization have the greatest impact on the index's performance. The index is composed of approximately 1,700 stocks and is considered to be a broad measure of the Japanese stock market.