assets under custody and administration

The total market value of financial assets that a financial institution holds, safekeeps, or administers on behalf of its clients.

Assets Under Custody and Administration (AUC/AUA) represents the total market value of financial assets that a financial institution holds, safekeeps, or administers on behalf of its clients. Unlike Assets Under Management (AUM), where an investment manager actively makes investment decisions and asset allocation choices, AUC/AUA involves administrative, operational, and safekeeping services. The custodian bank or administrator does not make investment decisions; instead, they act as the back-office infrastructure for institutional clients, mutual funds, and high-net-worth individuals. This metric is primarily observed in the quarterly and annual financial reports of major trust and custody banks. It is calculated by aggregating the current market value of all client securities, cash, and other financial instruments held in the institution's custody accounts or serviced through its administration platforms. Because these assets are owned by clients, they do not appear on the financial institution's balance sheet, but the scale of these assets directly dictates the service fees the institution can charge. Investors analyze AUC/AUA to evaluate the market share, scale, and competitive moat of custody banks. The custody business is highly sticky and capital-light, meaning it requires massive technology investments but yields highly recurring, transaction-based fee revenue once scale is achieved. A rising AUC/AUA figure indicates strong client retention and successful onboarding of new fund managers, while a declining figure may signal client attrition or a broad market downturn, as custody fees are typically priced in basis points relative to the total asset value.

A global custody bank is hired by an investment firm to service a new exchange-traded fund. The bank takes custody of the underlying basket of stocks and handles daily administrative accounting for the $50 billion portfolio. If the bank charges an administration fee of 0.02% (2 basis points) annually on these assets, the bank increases its AUC/AUA by $50,000,000,000 and generates annual fee revenue of $50,000,000,000 0.0002 = $10,000,000.