The listing of enterprises in Zhongyuan Equity Exchange Center refers to the activities of non-listed companies to disclose enterprise information in Zhongyuan Equity Exchange Center and conduct share custody, trading and financing. The types of listed entities are limited to joint stock limited companies, which are required to be established in accordance with the law and exist for twelve months. Where a limited liability company is converted into a joint stock limited company according to the original book net asset value, the duration can be calculated from the date of establishment of the limited liability company.