1, Morgan Stanley is a global financial services company, established in 1935 and headquartered in New York, USA, providing financial services such as investment banking, securities, wealth management and asset management, and is one of the largest investment banks in the world.

2. Deloitte is a global professional service company, established in 1845 and headquartered in London, England. It is one of the four largest accounting firms in the world, providing various professional services such as auditing, taxation, consulting, risk management and corporate financing.

Ernst & Young is a global professional service company, established in 1989 and headquartered in London, England. It is one of the four largest accounting firms in the world, providing various professional services such as auditing, taxation, consulting and corporate financing.

4.IBM is a global technology company, founded in 19 1 1, and headquartered in Armonk, new york, USA. The company is mainly engaged in computer hardware, software and services, and is one of the largest information technology companies in the world.

5. Microsoft is a global technology company, founded in 1975 and headquartered in Redmond, Washington, USA. The company is mainly engaged in computer software, hardware, games and Internet services. It is the largest software company and one of the most valuable brands in the world.