AUM (Assets Under Management)

Market Structure

Assets under management (AUM) refers to the total market value of investments that a financial institution manages on behalf of clients. For ETFs and mutual funds, AUM is the total value of the fund's holdings.

AUM is a measure of scale and investor confidence. For ETFs, larger AUM means better liquidity and tighter spreads. For mutual funds, rising AUM signals net inflows — investors adding money — while falling AUM can force managers to sell holdings at inopportune times.