OTC funds. Share subscription and share redemption funds are OTC funds. OTC funds (funds not traded on the stock exchange) are called subscription and redemption, while OTC funds (funds traded on the stock exchange) are called buying and selling. Investors buy OTC funds in fund companies, Tiantian funds, banks, brokers, Alipay, WeChat and other platforms. Fund, in English, refers to a certain amount of funds set up for a certain purpose. It mainly includes provident fund, trust and investment fund, insurance fund, retirement fund and various foundation funds.