Under what circumstances can a joint stock limited company acquire its shares?

According to Article 142 of the Company Law, a joint stock limited company may acquire the company's equity under the following circumstances: (1) reduce the registered capital of the company; (2) Merging with other companies holding shares of the Company; (3) Using shares for employee stock ownership plan or equity incentive; (4) Shareholders request the company to purchase their shares because they disagree with the resolution of merger or division made by the shareholders' meeting; (5) Using shares for the conversion of corporate bonds convertible into shares by listed companies. (6) The need for listed companies to safeguard their own values and shareholders' rights and interests.