The Shenzhen-listed group received the rating in a report jointly released by global risk management consulting firm Protiviti, the Chinese Academy of Social Sciences and the National School of Administration.
The top 100 companies were selected according to market value. They range from 29 different industries, including logistics, finance, communications and power generation.
The report noted that the standard of corporate governance in Chinese public companies has improved due to share structure reform measures and a better regulatory environment.
"The ongoing securities reform, starting from 2005, has shown a clear impact on the corporate governance of public firms, especially state-owned companies," said Liu Jianxin, president of Protiviti Greater China.
The share reform initiative has led to many Chinese companies setting up investor relationship departments. Furthermore 72 of the top 100 listed firms are using their company websites to strengthen information disclosure, the mainland publication added.