Differences...

 A Custodian bank, or simply custodian, is a financial institution responsible for safeguarding a firm's or individual's financial assets. The role of a custodian in such a case would be the following: to hold in safekeeping assets such as equities and bonds, arrange settlement of any purchases and sales of such securities, collect information on and income from such assets (dividends in the case of equities and coupons in the case of bonds), provide information on the underlying companies and their annual general meetings, manage cash transactions, perform foreign exchange transactions where required and provide regular reporting on all their activities to their clients. Custodian banks are often referred to as global custodians if they hold assets for their clients in multiple jurisdictions around the world, using their own local branches or other local custodian banks in each market to hold accounts for their underlying clients. Assets held in such a manner are typically owned by pension funds.

 A depository bank (U.S. usage) is a bank organized in the United States which provides all the stock transfer and agency services in connection with a depository receipt program. This function includes arranging for a custodian to accept deposits of ordinary shares, issuing the negotiable receipts which back up the shares, maintaining the register of holders to reflect all transfers and exchanges, and distributing dividends in U.S. dollars.

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