Assets under management measures investment assets overseen by a manager, with important distinctions from fund NAV, fee revenue, and investment returns.
Assets under management (AUM) is the value of investment assets that a firm or manager oversees, measured at a stated date under a stated reporting method. It describes the scale of the investment business, not the manager’s own wealth, revenue, or investment performance.
An AUM figure is useful only when its scope is clear. A manager reporting client-account market values and a private-fund manager including undrawn capital commitments may be measuring different things.
For a simple portfolio valued on a market-value basis, AUM is the sum of the included investments and cash. At firm level, the calculation may cover multiple funds, separately managed accounts, and investment strategies. Read the definition accompanying the figure before adding or comparing those amounts.
| Measure | What to identify | What not to assume |
|---|---|---|
| Reported AUM | The firm’s included products, valuation rules, and reporting date | Every firm uses an identical definition |
| Fee-earning AUM | Assets or commitments included in the firm’s fee-earning measure | The whole reported AUM earns the same fee |
| Regulatory AUM | The calculation required by the relevant regulator | It equals the firm’s marketing or financial-reporting measure |
| Assets under administration or custody | Assets receiving recordkeeping, settlement, or safekeeping services | The provider makes the investment decisions |
| Assets under advisement | The provider’s definition of assets receiving advice | The figure uses the same management criteria as AUM |
These distinctions matter when comparing investment businesses. A custody relationship, an advisory relationship, and a discretionary management mandate are different services even if they concern the same assets.
Suppose a hypothetical manager reports this annual reconciliation, in millions of dollars:
| Change | Amount |
|---|---|
| Opening AUM | $100 |
| Client subscriptions | +$15 |
| Client withdrawals | -$8 |
| Investment-value gains, excluding currency translation | +$6 |
| Currency translation into the reporting currency | -$2 |
| Mandates added through an acquisition | +$20 |
| Closing AUM | $131 |
Net client flows are $7 million, not $15 million. The $15 million and $8 million entries are gross inflows and outflows.
AUM increased by 31%, but investors did not earn a 31% return. Most of the increase came from client money and acquired mandates. Even dividing the $6 million gain by opening AUM would not establish a properly measured return without knowing the timing of cash flows and the performance methodology.
For example, a deposit received near year-end contributes to closing AUM but was not invested throughout the year. AUM reconciliation and historical performance therefore answer different questions.
The SEC’s Form ADV instructions use regulatory assets under management (RAUM) for qualifying portfolios receiving continuous and regular supervisory or management services. The calculation does not deduct outstanding debt or accrued unpaid liabilities. For private funds, it includes uncalled capital commitments. These are U.S. reporting rules, not a universal definition of AUM. See Form ADV instructions, Item 5.F.
Consider a hypothetical qualifying private fund:
| Item | Amount |
|---|---|
| Fair value of existing assets | $80 million |
| Liabilities | $20 million |
| Uncalled commitments | $30 million |
| Simplified fund NAV: assets less liabilities | $60 million |
| RAUM contribution: assets plus uncalled commitments | $110 million |
Assume the manager supervises the entire fund and all stated commitments qualify. The difference is methodological, not an additional $50 million of investor profit. Neither number automatically establishes the fee base.
Assume a contract charges 0.50% annually on an average fee base of $120 million:
Annual gross management-fee revenue = $120 million x 0.50% = $600,000.
That is revenue before the manager’s business expenses, not net profit. Applying the same rate to the $131 million closing AUM in the earlier example would use a different base.
Actual agreements may use average net assets, beginning-period account values, commitments, tiered rates, or other definitions. Separate performance fees and fee waivers can also change the result. The management-fee calculation belongs to the contract, not to the AUM label.
Size also has limitations. A larger asset base may support more resources, but it can make a strategy harder to implement in less-liquid investments. AUM alone cannot show whether trading capacity, controls, costs, or investment results are satisfactory.
This article is financial education, not a recommendation to choose a manager or fund based on its size.