The MoatWide moat

BlackRock (BLK) — moat facet

The parts of BlackRock people talk about are not the parts that make money: 29% of the assets produce 6% of the fees, and 3% produce 15%.

The best way to understand BlackRock's moat is to notice that the parts of the business everyone talks about are not the parts that make the money.

Share of long-term assets vs share of long-term base fees, 2025Institutional index29% of assets — 6% of feesETFs42% of assets — 45% of feesInstitutional active19% of assets — 24% of feesRetail10% of assets — 25% of feesAlternatives3% of assets — 17% of fees
The table that explains the company. A third of the money BlackRock manages contributes almost nothing; a tenth contributes a quarter.

Everyone talks about index funds. Institutional index — $3.7 trillion of pension and sovereign money tracking benchmarks — is 29% of long-term assets and 6% of long-term base fees1. It is close to a charitable operation. Everyone talks about the $14 trillion headline. The headline is a market-return machine: it goes up because equities go up, and BlackRock's cut of the increase is smaller each year.

What actually earns is narrower and stranger. It is the liquidity of a handful of enormous exchange-traded funds, which competitors can match on price and cannot match on depth. It is a software platform that rival asset managers pay to use. It is a fee mix in which 3% of the assets — alternatives — produce 17% of the long-term base fees2, and 10% of the assets — retail — produce 25%3. And it is the sheer difficulty of leaving: a benchmark-tracking mandate is not a product you are dissatisfied with, it is plumbing, and plumbing gets replaced only when something breaks.

Each of those four is real and none of them is impregnable. The ETF advantage is a network effect, which is the sturdiest kind of moat and also the kind that transfers wholesale to a challenger who reaches critical mass. Aladdin is deeply embedded and structurally unloved — every client would prefer not to depend on a competitor's system, and several are large enough to build their own. The fee mix is favourable today because BlackRock spent roughly $30 billion of stock and cash acquiring the favourable end of it, which is a purchase rather than an advantage. And stickiness cuts the other way when it goes: a single institutional client's partial redemption took $119 billion out in 20254, and nobody outside the firm knows who it was.

Set against that, the returns are what a wide moat looks like. Return on equity has run in a 13% to 16% band for a decade5 on a business with almost no capital intensity, at operating margins in the mid-forties on the adjusted basis the industry uses6. Fee-based revenue arrives whether performance is good or bad. There is no inventory, no factory, no product cycle. The largest risk to the earnings is not a competitor taking customers; it is the price of the service falling while the volume rises, which is what has been happening for twenty years and has not stopped.

The verdict is wide, with a specific and uncomfortable caveat. BlackRock's advantages are genuine, durable and hard to attack directly. They are also being partly funded rather than earned: the growth in the profitable end of the mix came from writing cheques. The number that would falsify the thesis is the base fee rate — base fees divided by average assets. If assets keep compounding at 10% a year and base fees do not, the moat is holding an emptying vessel.

Moat trajectory: Holding steady

The advantages are intact and none of them is improving. iShares keeps compounding its liquidity lead, Aladdin keeps adding modules, and both are offset by the same force that has been running for twenty years: the price of the service falls faster than the assets grow. What changed recently was purchased rather than earned — the private-markets mix arrived with $30 billion of equity attached and a return on equity that fell to 10.7% carrying it.

The number that tests this moat
Moat Explorer calc
Return on equity vs 9% cost of equity
10.7% in 2025, from 14.7%

Net income of $5,553M against average shareholders' equity that rose from $47.5B to $55.9B. The band had held between 13% and 16% for a decade; the fall is the goodwill from GIP, HPS and Preqin arriving before the earnings do. If it does not climb back above the hurdle within a few years, the acquisitions were not worth what was paid.

Source: BlackRock Form 10-K, fiscal year 2025 ↗
Aspects of the moat
DIG DEEPER 01
iShares and the Liquidity Advantage
Rivals matched the price a decade ago and it changed nothing, because in exchange-traded funds the product is depth, not cost.
DIG DEEPER 02
Aladdin: The Software Its Rivals Run On
Competing asset managers pay BlackRock to run their portfolios, and would all prefer not to — the moat is captivity, not affection.
DIG DEEPER 03
The Fee Mix Nobody Reads
Read the two columns side by side and BlackRock is a different company from the one in the headlines: a tenth of the assets pay a quarter of the fees.
DIG DEEPER 04
Money That Does Not Leave
Assets that cannot be fired and can always be repriced — loyal money at a falling rate is the whole industry's history.
References
  1. ReportedInstitutional index — $3.7 trillion of pension and sovereign money tracking benchmarks — is 29% of long-term assets and 6% of long-term base fees
    BlackRock, Inc. Form 10-K, FY2025, Item 1 Business — share of long-term AUM against share of long-term base fees and securities lending revenue: ETFs 42% of AUM and 45% of fees; institutional index $3.7 trillion, 29% of AUM and 6% of fees, with $119 billion of net outflows "driven primarily by a single client's partial redemptions"; institutional active 19% of AUM and 24% of fees; retail 10% of AUM and 25% of fees, of which active and index mutual funds are approximately $860 billion or 70% of retail long-term AUM and approximately 70% of retail long-term AUM is in active products; equity 61% of long-term AUM and 50% of long-term base fees. "Institutional non-ETF index assignments tend to be very large (multi-billion dollars) and typically reflect low fee rates. Net flows in institutional index products generally have a small impact on BlackRock's revenues and earnings." — FY2025 · publ. February 2026 · source ↗
  2. ReportedIt is a fee mix in which 3% of the assets — alternatives — produce 17% of the long-term base fees, and 10% of the assets — retail — produce 25%
    BlackRock, Inc. Form 10-K, FY2025, Item 1 Business — share of long-term AUM against share of long-term base fees and securities lending revenue: ETFs 42% of AUM and 45% of fees; institutional index $3.7 trillion, 29% of AUM and 6% of fees, with $119 billion of net outflows "driven primarily by a single client's partial redemptions"; institutional active 19% of AUM and 24% of fees; retail 10% of AUM and 25% of fees, of which active and index mutual funds are approximately $860 billion or 70% of retail long-term AUM and approximately 70% of retail long-term AUM is in active products; equity 61% of long-term AUM and 50% of long-term base fees. "Institutional non-ETF index assignments tend to be very large (multi-billion dollars) and typically reflect low fee rates. Net flows in institutional index products generally have a small impact on BlackRock's revenues and earnings." — FY2025 · publ. February 2026 · source ↗
  3. ReportedIt is a fee mix in which 3% of the assets — alternatives — produce 17% of the long-term base fees, and 10% of the assets — retail — produce 25%
    BlackRock, Inc. Form 10-K, FY2025, Item 1 Business — share of long-term AUM against share of long-term base fees and securities lending revenue: ETFs 42% of AUM and 45% of fees; institutional index $3.7 trillion, 29% of AUM and 6% of fees, with $119 billion of net outflows "driven primarily by a single client's partial redemptions"; institutional active 19% of AUM and 24% of fees; retail 10% of AUM and 25% of fees, of which active and index mutual funds are approximately $860 billion or 70% of retail long-term AUM and approximately 70% of retail long-term AUM is in active products; equity 61% of long-term AUM and 50% of long-term base fees. "Institutional non-ETF index assignments tend to be very large (multi-billion dollars) and typically reflect low fee rates. Net flows in institutional index products generally have a small impact on BlackRock's revenues and earnings." — FY2025 · publ. February 2026 · source ↗
  4. ReportedAnd stickiness cuts the other way when it goes: a single institutional client's partial redemption took $119 billion out in 2025, and nobody outside the firm knows who it was
    BlackRock, Inc. Form 10-K, FY2025, Item 1 Business — share of long-term AUM against share of long-term base fees and securities lending revenue: ETFs 42% of AUM and 45% of fees; institutional index $3.7 trillion, 29% of AUM and 6% of fees, with $119 billion of net outflows "driven primarily by a single client's partial redemptions"; institutional active 19% of AUM and 24% of fees; retail 10% of AUM and 25% of fees, of which active and index mutual funds are approximately $860 billion or 70% of retail long-term AUM and approximately 70% of retail long-term AUM is in active products; equity 61% of long-term AUM and 50% of long-term base fees. "Institutional non-ETF index assignments tend to be very large (multi-billion dollars) and typically reflect low fee rates. Net flows in institutional index products generally have a small impact on BlackRock's revenues and earnings." — FY2025 · publ. February 2026 · source ↗
  5. ReportedReturn on equity has run in a 13% to 16% band for a decade on a business with almost no capital intensity, at operating margins in the mid-forties on the adjusted basis the industry uses
    BlackRock, Inc. Form 10-K, FY2025, consolidated financial statements — revenue $24,216M (2024 $20,407M, 2023 $17,859M, 2022 $17,873M, 2021 $19,374M); base fees and securities lending $19,179M / $16,100M / $14,399M; performance fees $1,424M / $1,207M / $554M; technology services and subscription $1,981M / $1,603M / $1,485M; distribution fees $1,355M / $1,273M / $1,262M; advisory and other $277M / $224M / $159M; operating income $7,045M at a 29.1% margin (2024 37.1%, 2023 35.1%, 2022 35.7%, 2021 38.5%); net income $5,553M (2024 $6,369M); diluted earnings per share $35.31 (2024 $42.01, 2023 $36.51, 2022 $33.97, 2021 $38.22); as adjusted, operating income $9,600M at 44.1%, net income $7,736M and diluted EPS $48.09 against $43.61; total stockholders' equity $55,888M (2024 $47,495M, 2023 $39,347M) — FY2025 · publ. February 2026 · source ↗
  6. ReportedReturn on equity has run in a 13% to 16% band for a decade on a business with almost no capital intensity, at operating margins in the mid-forties on the adjusted basis the industry uses
    BlackRock, Inc. Form 10-K, FY2025, consolidated financial statements — revenue $24,216M (2024 $20,407M, 2023 $17,859M, 2022 $17,873M, 2021 $19,374M); base fees and securities lending $19,179M / $16,100M / $14,399M; performance fees $1,424M / $1,207M / $554M; technology services and subscription $1,981M / $1,603M / $1,485M; distribution fees $1,355M / $1,273M / $1,262M; advisory and other $277M / $224M / $159M; operating income $7,045M at a 29.1% margin (2024 37.1%, 2023 35.1%, 2022 35.7%, 2021 38.5%); net income $5,553M (2024 $6,369M); diluted earnings per share $35.31 (2024 $42.01, 2023 $36.51, 2022 $33.97, 2021 $38.22); as adjusted, operating income $9,600M at 44.1%, net income $7,736M and diluted EPS $48.09 against $43.61; total stockholders' equity $55,888M (2024 $47,495M, 2023 $39,347M) — FY2025 · publ. February 2026 · source ↗
Sources
Generated September 23, 2026