Legal analysis: invalid. The contract of buying and selling stocks by entrustment between individuals is invalid. The Securities Law stipulates that no institution or individual may engage in securities and futures investment consulting business without the permission of the China Securities Regulatory Commission. Individual citizens accept the entrustment to manipulate stock investment for others, which violates the mandatory provisions of laws and regulations on employees of securities service institutions. If one party to the entrustment contract for stock trading is unqualified, the entrustment contract shall be invalid.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 153 A civil juristic act that violates the mandatory provisions of laws and administrative regulations is invalid. However, unless mandatory provisions do not invalidate civil legal acts. A civil legal act that violates public order and good customs is invalid.

Article 154 A civil legal act in which the actor colludes with the counterpart in bad faith and damages the legitimate rights and interests of others is invalid.

Article 155 A civil juristic act that is invalid or revoked is not legally binding from the beginning.