What does the National Social Security Fund 503 portfolio mean?

According to relevant information, the National Social Security Fund 503 portfolio means that the 503 account represents the social security fund portfolio and is not open to individual investors. The social security fund is that the state entrusts part of the endowment insurance premiums paid by enterprises and institutions to professional institutions for management, so as to maintain and increase the value. Account 503 represents the social security fund portfolio. Social security fund refers to the social security fund managed by the central finance and the National Social Security Fund Council, which consists of funds transferred from state-owned shares and equity assets, funds transferred from the central finance, funds raised by other means approved by the State Council and their investment income. A 503 portfolio is a 503 account, which is not open to individual investors. Social security fund is a part of funds paid by enterprises and employees to professional institutions for management to maintain and increase value. Therefore, the National Social Security Fund 503 portfolio means that the 503 account represents the social security fund portfolio and is not open to individual investors. The social security fund is that the state entrusts part of the endowment insurance premiums paid by enterprises and institutions to professional institutions for management, so as to maintain and increase the value.