The TOPIX, or Tokyo Stock Price Index, is a major stock market index that tracks the performance of all domestic companies listed on the Tokyo Stock Exchange. It serves as a key indicator of the overall health of the Japanese stock market and economy. The index is weighted by market capitalization, meaning larger companies have a greater impact on its value. Launched in 1969, the TOPIX is widely used by investors and analysts to gauge market trends and make investment decisions. It includes a diverse range of sectors, reflecting the broad spectrum of the Japanese economy, from technology to consumer goods.