For a listed company. If it intends to list on another stock exchange, it can have two choices: one is to issue different types of shares abroad and list them in overseas markets. Another form is that the same type of stocks are listed in two places, and the cross-market circulation of stocks is realized through international custodian banks and securities brokers. This method is also commonly known as secondary listing, and listing on overseas markets with depositary receipts (ADR or GDR) belongs to this type.