In trading, the term “dual listing” is used in reference to securities which have two separate primary listings on two separate stock exchanges. For example, a company may choose to list its stock on a stock exchange in another region while maintaining its listing on the exchange which first listed it.
Typically, dual listings are accomplished by dividing a company into two separate holding companies. For example, a Swiss company may choose to create a U.S. holding company which can hold a primary listing on a U.S. stock exchange.
Swiss stock broker comparison