Wholesale banking is the provision of services by banks to larger customers or organizations such as mortgage brokers, large corporate clients, mid-sized companies, real estate developers and investors, international trade finance businesses, institutional customers (such as pension funds and government entities/agencies), and services offered to other banks or other financial institutions.Wholesale finance refers to financial services conducted between financial services companies and institutions such as banks, insurers, fund managers, and stockbrokers.
Modern wholesale banks engage in:

Finance wholesaling
Underwriting
Market making
Consultancy
Mergers and acquisitions
Fund management