What it means
AUM counts client money the firm controls, valued at current market prices rather than at what clients originally paid in. It moves for two quite different reasons: clients adding or withdrawing money, and markets rising or falling.
Separating those two causes is the single most useful thing you can do with an AUM figure. A manager whose AUM grew 12% in a year when markets rose 15% is actually losing client money, which is why the industry reports the split between net flows and market movement.
The number matters because fees are usually charged as a percentage of AUM, often quoted in basis points where one basis point is 0.01%. That makes revenue highly geared to markets: a 20% fall in asset prices takes roughly 20% off fee income with none of the cost base disappearing.
Definitions vary more than you would expect. Some firms include assets they only advise on, some include committed but uninvested capital, and some count the same money twice when one of their own funds invests in another, so the comparable figure is net AUM after those adjustments.
AUM also sets a firm's standing with regulators and distributors. Crossing certain thresholds brings extra reporting duties, and many pension funds and platforms will not appoint a manager below a minimum size, which is why small firms chase AUM growth even on thin margins.
For anyone outside the industry, the practical use of AUM is as a sense check. Dividing revenue by average AUM tells you the blended fee the firm actually earns, which is often far lower than its published rate card suggests.
In practice
Real-world examples.
Example
A wealth adviser with $250,000,000 under management charges 1% a year, giving revenue of $2,500,000 before any performance fees. When markets drop sharply in a quarter, the firm's income falls immediately even though it has the same clients and the same staff costs.
Example
A pension scheme choosing between two managers notices that the larger one reports $40,000,000,000 of AUM but only $9,000,000,000 of discretionary mandates, with the rest advisory. The trustees compare the two on discretionary assets only, which reverses the ranking.
Example
A private equity firm quotes AUM that includes $600,000,000 of committed capital it has not yet invested. An analyst modelling fee income adjusts for this, because the firm charges its fee on committed capital during the investment period and on invested capital afterwards.
Formula
Calculation
Management fee = average assets under management x annual fee rate. Average AUM is normally the average of the opening and closing balances, or a daily average where the fee agreement says so.
Suppose a boutique manager starts the year with $800,000,000 of client assets and ends it with $1,000,000,000. Average AUM is ($800,000,000 + $1,000,000,000) / 2 = $900,000,000. At an annual management fee of 0.75%, fee revenue is $900,000,000 x 0.0075 = $6,750,000.
Now split the growth. If clients contributed $40,000,000 net during the year, the remaining $160,000,000 of the $200,000,000 increase came from market performance, so only one fifth of the growth was won rather than received from rising prices.Case study
Seen in the real world.
Harbourline Capital is an illustrative, fictional asset manager used to show how AUM can flatter a business. Over three years its AUM rose from $1,200,000,000 to $1,800,000,000, and the founders began planning a new office and six new hires.
When a prospective buyer looked at the detail, the picture changed. Net client flows over the three years were negative at minus $90,000,000, and the whole increase came from strong equity markets plus one $150,000,000 mandate from a single pension fund that was due to be retendered.
The buyer valued Harbourline on fee income adjusted for that concentration rather than on headline AUM, and the price came in well below what the founders expected. The illustrative lesson is that AUM growth is only worth paying for when clients, rather than markets, are supplying it.
Watch out
Common mistakes.
- Reading AUM growth as proof the firm is winning business. Rising markets inflate AUM without a single new client, so always look for the net flow figure alongside it.
- Comparing two managers' AUM without checking what each includes. Advisory assets, committed capital and double-counted holdings across a firm's own funds can all sit inside the headline number.
- Assuming revenue is AUM times the published fee rate. Large clients negotiate discounts, so the blended rate a firm actually earns is usually well below its rate card.
Questions
People also ask.
How often is AUM restated?
Most firms report it monthly or quarterly at market value, and the figure you see in marketing material can be several weeks old.
Does AUM include the firm's own money?
Capital the firm invests from its own balance sheet is normally disclosed separately, because no fee is charged on it and it carries different risk.
Why do managers cut fee rates as AUM grows?
Costs rise far more slowly than assets, so a manager can share some of that scale benefit through tiered rates and still improve its own margin.
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