Major ClientsNarrow moat
BlackRock (BLK) — moat facet
No customer above 10% of revenue, and one client that took $119 billion out in a single year.
BlackRock discloses no customer concentration. Its filings contain no table of largest clients and no threshold disclosure, because no client reaches a level that would require one. On the standard measure, this is one of the most diversified revenue bases in this collection — the opposite of Nvidia's 22% from a single direct customer1 or CoreWeave's 67% from one2.
That measure is also the wrong one here, and the 2025 accounts contain the proof. Institutional index assets recorded $119 billion of net outflows during the year, driven primarily by a single client's partial redemptions3. One client, reducing part of an allocation, moved a sum larger than most asset managers hold in total. It barely touched revenue, because that money earns almost nothing — but the diversification implied by 'no customer above 10% of revenue' plainly does not extend to flows.
The more useful way to see BlackRock's client base is that it has four kinds of counterparty, and only one of them is the person whose money it actually is.
There are institutions: pension funds, sovereign wealth funds, insurers and endowments, with $3.9 trillion of pension assets alone4. There are the intermediaries — broker-dealers, banks, insurance companies and independent advisers5 — through whom BlackRock reaches every individual investor it serves, since it has no direct retail channel of its own. There are the technology clients, who are frequently competing asset managers. And underneath all of it there are several hundred million people who own BlackRock funds inside retirement accounts, have never chosen the firm, and in most cases could not name it.
The rating is narrow. Revenue diversification is genuine and valuable; the absence of any customer able to dictate terms is a real structural strength. But the flows are concentrated in ways the disclosure does not capture, the most profitable channel is controlled by intermediaries, and the ultimate owner of the assets is not the party BlackRock has a relationship with.
No client reaches a level requiring disclosure and none has acquired leverage over pricing. The flow concentration demonstrated in 2025 is a standing feature of an institutional business built on very large mandates, not a new development.
No client is large enough to disclose, and flows now come mostly from ETFs and retail. Institutional flows this small show how little of the growth comes from the largest direct clients.
Source: BlackRock Form 10-Q, Q2 2026 ↗- ReportedOn the standard measure, this is one of the most diversified revenue bases in this collection — the opposite of Nvidia's 22% from a single direct customer or CoreWeave's 67% from oneNVIDIA Form 10-K, FY2026 — "For fiscal year 2026, sales to one direct customer represented 22% of total revenue and sales to another direct customer represented 14% of total revenue"; FY2025: one at 12% and two at 11% each; FY2024: one at 13%. Direct customers include OEMs, ODMs, distributors and system integrators; indirect customers (CSPs, Neocloud builders, AI model makers, enterprises, public sector) buy through them, and NVIDIA "estimate[s] some individually representing 10% or more of our revenue". "Our revenue is concentrated among a limited number of direct and indirect customers and this trend may continue." — FY2026 (ended Jan 25, 2026) · publ. February 2026 · source ↗
- ReportedOn the standard measure, this is one of the most diversified revenue bases in this collection — the opposite of Nvidia's 22% from a single direct customer or CoreWeave's 67% from oneCoreWeave Form 10-K, fiscal 2025 — revenue $5.13B (+168%), net loss ~−$1.2B; customer concentration disclosed (largest customer ~2/3 of revenue) — FY2025 · publ. early 2026 · source ↗
- ReportedInstitutional index assets recorded $119 billion of net outflows during the year, driven primarily by a single client's partial redemptionsBlackRock, 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 ↗
- ReportedThere are institutions: pension funds, sovereign wealth funds, insurers and endowments, with $3.9 trillion of pension assets aloneBlackRock, Inc. Form 10-K, FY2025, Item 1 Business — alternatives AUM $423,614M at 31 December 2025, growing at a five-year rate of 22% a year against 10% for total AUM; "approximately $91 billion of non-fee paying, unfunded, uninvested commitments to deploy, primarily for institutional clients, which is not included in AUM"; alternatives net inflows led by infrastructure, private credit and private equity, with liquid alternatives net inflows of $3 billion; BlackRock "is among the world's largest managers of pension plan assets with $3.9 trillion, or 62%, of long-term institutional AUM managed for defined benefit, defined contribution and other pension plans for corporations, governments and unions" — FY2025 · publ. February 2026 · source ↗
- ReportedThere are the intermediaries — broker-dealers, banks, insurance companies and independent advisers — through whom BlackRock reaches every individual investor it serves, since it has no direct retail channel of its ownBlackRock, Inc. Form 10-K, FY2025, Item 1 Business — Aladdin Enterprise, Aladdin Risk, Aladdin Wealth, eFront, Preqin and Cachematrix; "while Aladdin is a multi-asset system, the majority of positions managed on the platform are fixed income"; the March 2025 Preqin acquisition "added private markets data capabilities to its existing Aladdin and eFront workflow offerings, creating a preeminent private markets technology and data provider" and "as clients' private market allocations continue to grow, they will require more standardized and transparent data on their investments, creating an additional growth opportunity for Preqin"; index AUM within or above applicable tolerance of 95%, 96% and 99% across the disclosed periods; retail investors "are served principally through intermediaries, including broker-dealers, banks, trust companies, insurance companies and independent financial advisors" and "technology solutions, digital distribution tools and a shift toward portfolio construction are increasing the number of financial advisors and end-retail investors using BlackRock products" — FY2025 · publ. February 2026 · source ↗