legal ground
Article 120 of the Company Law of People's Republic of China (PRC)
A listed company as mentioned in this Law refers to a joint stock limited company whose shares are listed and traded on a stock exchange.
Article 144
The shares of listed companies shall be listed and traded in accordance with relevant laws, administrative regulations and trading rules of stock exchanges.
Article 145
A listed company must disclose its financial status, business operations and major lawsuits in accordance with the provisions of laws and administrative regulations, and publish its financial and accounting reports every six months in each fiscal year.