Shuangchuang refers to the Science and Technology Innovation Board and the Growth Enterprise Market, so Shuangchuang ETF refers to the index fund with the GEM index of the Science and Technology Innovation Board as the investment target. Among them, it is generally a leader like tracking the CSI Science and Technology Innovation 50 Index, which is referred to as the Shuangchuang leader.

Transactional open-end index fund, commonly known as exchange-traded fund (ETF), is an open-end fund with variable fund share, which is listed and traded on the exchange.

Transactional open-end index fund is a special type of open-end fund, which combines the operating characteristics of closed-end fund and open-end fund. Investors can buy or redeem fund shares from fund management companies, and at the same time, they can buy and sell ETF shares at the market price in the secondary market like closed-end funds.

However, the purchase and redemption must use a basket of stocks for fund shares or use fund shares for a basket of stocks. Because there are both secondary market transactions and subscription and redemption mechanisms, investors can carry out arbitrage transactions when there is a difference between the market price of ETF and the net value of fund units. The existence of arbitrage mechanism makes ETF avoid the common discount problem of closed-end funds.

According to different investment methods, ETFs can be divided into index funds and actively managed funds. Most foreign ETFs are index funds. At present, ETFs launched in China are also index funds. ETF index fund represents the ownership of a basket of stocks, which refers to the index fund that is traded on the stock exchange like stocks, and its trading price and fund share net value trend are basically consistent with the tracked index.

Therefore, investors buying and selling an ETF is equivalent to buying and selling the index it tracks, and can get basically the same income as the index. Usually, it adopts a completely passive management mode, aiming at fitting an index, which has the characteristics of both stocks and index funds.