VINX 30 is an investment benchmark index that measures the performance of stocks listed on the Tokyo Stock Exchange (TSE) Mothers market. It is one of the most widely followed and traded indices in Japan, reflecting the performance of the largest, most liquid, and most important stocks in the TSE Mothers market.

The VINX 30 index began trading in 2003 and is composed of 30 of the largest TSE Mothers stocks based on their market capitalization. The index's components are weighted based on their market capitalization size, such that the largest stock contributes most to the index.

The VINX 30 index is designed to be a reflection of the overall performance of the Tokyo Stock Exchange and the Japanese market. The index is used by investors to gain exposure to the Japanese market and can be used as a measure of performance for ETFs (exchange-traded funds) and other products that track the index.

The makeup of the VINX 30 index is rebalanced semi-annually (in April and October) to reflect changes in market capitalizations and to maintain liquidity and diversification. As a result of its rebalancing, the value of the VINX 30 index is not affected by changes in the size of individual stocks and it is not subject to the risk of bias due to individual stock influences.

The VINX 30 index is a powerful tool for understanding the performance of the Japanese stock market. It has a long history and covers a wide range of industries, providing a comprehensive overview of the Japanese stock market. It is a valuable resource for investors seeking to gain exposure to the Japanese stock market or to analyze its performance.