1. Corporate bonds and stock trading: This involves the financing activities of the company in the open market or the private market. For example, a company may issue new shares or bonds to raise funds for expansion, R&D or other corporate activities. Investors can buy these stocks or bonds, provide funds for the company, and expect to get returns from the company's growth and profits.

2. Trading in commodities and derivatives: This includes trading in various commodities (such as gold, oil, agricultural products, etc.). ) and derivatives (such as futures and options). ) is the behavior of traders in the exchange to predict the future market trend and make trading decisions on this basis.

3. Foreign exchange transactions: Foreign exchange transactions are another important part of private sector financial transactions. Because the exchange rates of currencies in different countries are different, traders will buy and sell currencies according to the forecast of exchange rate trends to earn profits. For example, if a trader predicts that the dollar will appreciate against the euro, he will buy dollars and sell euros.