AUM rises with performance and subscriptions and falls with losses and redemptions. Allocators use it to judge whether a fund is large enough to be operationally stable and small enough for the strategy to remain nimble. Fee minimums from service providers make funds below a certain AUM uneconomic, which is the sub-scale problem emerging managers face.
A manager's total AUM may span several funds and managed accounts; fund AUM refers to a single vehicle.
