1. Financial technology companies: such as Ant Group, JD Finance and lufax. These companies are leading in the field of financial technology. We can discuss how they use big data, artificial intelligence and other technologies to improve financial services.

2. Traditional financial institutions: such as China Bank, China Industrial and Commercial Bank, China Construction Bank, etc. These institutions have great influence in the financial market, and we can study how they respond to the changes and risks in the financial market.

3. Securities companies: such as CITIC Securities, Huatai Securities and Guotai Junan. These companies have strong strength and experience in securities business, and we can study how they use financial engineering technology to provide services for investors.