Stocks that are heavily held by a number of fund companies and account for more than 20% of the circulating market value are fund heavyweight stocks. In other words, more than 20% of the stocks are held by funds, which can be found in the K-line chart of stock software in the stock column of various websites.

For example, in the Great Wisdom software, press the F 10 key in the K-line chart, click on the shareholders' entry and exit to check the shareholders' shareholding, and the top ten tradable shareholders can check the fund's shareholding ratio and changes. In the lower right corner of the daily K-line chart, click the diagnosis column to find out the shareholding ratio of large funds. Check attendance records frequently, and you can analyze the increase and decrease of large funds.