First: Shenzhen Zhongwei Zhiyan Consulting Co., Ltd. This company enjoys a high reputation in the industry and can be said to be the leading enterprise of research companies. There are branches in major cities all over the country, headquartered in Shenzhen, and have done research for many listed companies. The first one is Zhongwei Consulting.
Second, Shanghai Nielsen Market Research Co., Ltd. is a subsidiary of VNU Group in the Netherlands and a global market research company. AC Nielsen has a history of 80 years in the field of market research, providing monitoring and analysis of market dynamics, consumer behavior, traditional and emerging media in more than 100 countries around the world. Customers rely on AC Nielsen's market research, proprietary products, analytical tools and professional services to understand the competitive environment, explore new opportunities and improve the effectiveness and profit of their marketing and sales actions.
Third, Zero Research Consulting Group: Zero Research provides professional services for all enterprises and institutions that need to discover the truth. Customers mainly include multinational companies, well-known enterprises in China, China government departments, foreign academic institutions and United Nations agencies.
Fourthly, iResearch Group: At present, the main service products of iResearch include iUserTracker (Internet User Behavior Continuous Research System), iAdTracker (Internet Advertising Monitoring and Analysis System), iUserSurvey (Internet User Research and Analysis Service) and iDataCenter (Internet Industry Research Data Center).
The above four companies are recommended, all of which are well-known domestic enterprises. I am familiar with Shenzhen Zhongwei Consulting, and I have also dabbled in major media and CCTV, which is relatively the most authoritative.