Lof fund can't know the premium before closing, because the off-exchange net value of lof fund has not been announced before closing, so it can't know the premium. Although many softwares have off-site valuation of lof, the accuracy of valuation is not high.

LOF funds are called "open-end funds" in English and "listed open-end funds" in Chinese. It is a kind of securities investment fund, which can be traded on the stock exchange or purchased and redeemed from the fund company.