Foreign Exchange Market Participants

There are four types of market participants—banks, brokers, customers, and central banks.
Banks and other financial institutions are the biggest participants. They earn profits by buying and selling currencies from and to each other. Roughly two-thirds of all FX transactions involve banks dealing directly with each other.
Brokers act as intermediaries between banks. Dealers call them to find out where they can get the best price for currencies. Such arrangements are beneficial since they afford anonymity to the buyer/seller. Brokers earn profit by charging a commission on the transactions they arrange.
Customers, mainly large companies, require foreign currency in the course of doing business or making investments. Some even have their own trading desks if their requirements are large. Other types of customers are individuals who buy foreign exchange to travel abroad or make purchases in foreign countries.
Central banks, which act on behalf of their governments, sometimes participate in the FX market to influence the value of their currencies.