This kind of stock is held by many fund companies, accounting for more than 20% of the circulating market value. 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 of various websites. For example, in the Great Wisdom software, press the F 10 key in the K-line chart, and click on the shareholders' entry and exit to view the shareholders' shareholding. The top ten circulating shareholders can view the fund shareholding ratio and changes at a glance. In the lower right corner of the daily K-line chart, click the diagnostic bar to find out the shareholding ratio of large funds. Check attendance records frequently, and you can analyze the increase and decrease of large funds. The original quantitative trading system can help you solve problems easily.