Investment in ETF funds requires a stock account to trade, but securities practitioners cannot open a stock account, so they cannot trade ETF funds. However, securities practitioners can buy ETF-linked funds over the counter, which are basically similar to ETF funds.

ETF fund is a special type of open-end fund, and its tracking object is index. It combines the characteristics of closed-end funds and open-end funds, which can be traded in the market or purchased or redeemed from fund companies.