Major ClientsWide moat

Walmart (WMT) — moat facet

Perfect diversification among the customers who walk in, and real concentration among the counterparties who decide what Walmart earns.

Walmart's customer-concentration disclosure is an absence. There is no table, no named buyer, no percentage — because approximately 280 million customers pass through the business every week1 and not one of them is material.

Largest customer as a share of revenue (%)~67%CoreWeave22%Nvidia20.4%Kioxia (Apple)none disclosedWalmartWalmart's 10-K carries no customer-concentration table because there is nothing to put in one.
Perfect diversification among the customers who walk in. The concentration Walmart does have is in counterparties who are not shoppers.

That is the most complete revenue diversification in this collection, and it is worth seeing next to the alternatives. Nvidia disclosed one direct customer at 22% of revenue and another at 14%2. CoreWeave's largest customer has been about two thirds of its revenue3. Kioxia named Apple at 20.4%4. Walmart's single largest source of revenue is a household in a town somewhere, spending a few thousand dollars a year, and the loss of any thousand of them would not be visible in the accounts.

But Walmart has three other kinds of customer, and they behave nothing like the shopper. The first is the supplier, which is the genuinely surprising one: the companies that sell goods to Walmart now also buy advertising from it — roughly $6.4 billion of it in fiscal 20265 — along with data analytics and insights6. That is the same counterparty appearing twice on opposite sides of the ledger, paying Walmart for access to a shelf it has already sold Walmart the right to occupy.

The second is the marketplace seller, who is a customer for commission and fulfilment services, a supplier of inventory, and a competitor for the same sale. Marketplace sales grew 52% in the June 2026 quarter7.

The third is the payer standing behind the pharmacy counter — the benefit managers, insurers and government programmes that reimburse most of a $69,547 million health and wellness business8 and, since January 2026, set some of the prices outright.

So the honest summary is that Walmart has perfect diversification among the customers who walk in and real concentration among the counterparties who decide what it earns. Nothing in the concentration table captures that, because there is no concentration table.

The one line worth following is membership and other income, $6,750 million last year against $5,488 million two years before9 — the only line that measures a customer who has committed to anything.

Moat trajectory: Holding steady

The shopper base is as diversified as a customer base can be and has been for decades. What is changing is the emergence of counterparties who are customers rather than shoppers — advertisers, marketplace sellers, benefit managers — and those relationships are more concentrated and more consequential than anything in the revenue table.

The number that tests this moat
Reported
Revenue, latest quarter
$187.9 billion, up 5.9%

About 280 million customers a week and none of them material, so every dollar is won again each week. Growth holding near 6% is that repeated choice in aggregate.

Source: Walmart Q2 FY2027 earnings release ↗
Dig deeper
DIG DEEPER 01
Two Hundred and Eighty Million a Week, and Nothing to Disclose
Diversified by name and perfectly correlated by circumstance, with no contracted revenue at all.
DIG DEEPER 02
The Supplier Who Became an Advertiser
The same counterparty on both sides of the ledger, paying Walmart for access to a shelf it sold Walmart the right to occupy.
DIG DEEPER 03
The Marketplace Seller Is Three Things at Once
Customer, supplier and competitor — and Walmart bills it for two of the three.
DIG DEEPER 04
The Payer Behind the Pharmacy Counter
The customer at the counter pays a fraction of it; the counterparty that decides the rest is not in the store.
References
  1. ReportedThere is no table, no named buyer, no percentage — because approximately 280 million customers pass through the business every week and not one of them is material.
    Walmart Form 10-K, fiscal year ended January 31, 2026 - Item 1 Business and Item 2 Properties (approximately 280 million customers a week across more than 10,900 stores in 19 countries; 2.1 million associates, 1.6 million in the U.S.; 4,611 Walmart U.S. retail units of which 3,728 owned, 601 Sam's Clubs of which 464 owned, 5,743 international stores of which 1,486 owned; 3,566 supercenters at 633,724 thousand square feet, 351 discount stores at 36,609, 694 neighborhood markets and small formats at 36,609/28,375 with a 42,000 average; 192 U.S. and 179 international distribution facilities, 149 owned; pickup and delivery at over 8,400 locations globally; EDLP and EDLC; private brands; competition; Flipkart and PhonePe majority stakes in 2018) — FY2026 (ended January 31, 2026) · publ. March 13, 2026 · source ↗
  2. ReportedNvidia disclosed one direct customer at 22% of revenue and another at 14%.
    NVIDIA 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 ↗
  3. ReportedCoreWeave's largest customer has been about two thirds of its revenue.
    CoreWeave 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 ↗
  4. ReportedKioxia named Apple at 20.4%.
    Kioxia Holdings Corporation, Annual Securities Report for the year from 1 April 2025 to 31 March 2026 (8th Period) — revenue ¥2,337,628M against ¥1,706,460M, gross profit ¥1,012,904M, operating profit ¥869,013M, profit for the year ¥554,490M; research and development cost ¥141,052M against ¥132,798M; purchases of property, plant and equipment ¥281,062M against ¥223,847M; operating cash flow ¥616,540M; proceeds from government grants ¥56,396M against ¥43,748M, from an approved ceiling of ¥150.0bn for flash production at the Yokkaichi and Kitakami plants with about ¥31.8bn not yet received. Revenue by application: SSD & Storage ¥1,362,638M, Smart Devices ¥759,978M, Other ¥215,012M — 'Other' including retail products and sales to the Sandisk group recorded through the three manufacturing joint ventures. Revenue by geography: Japan ¥263,252M, North America and Europe ¥1,217,643M, Asia ¥856,733M, with the United States ¥1,098,832M, China ¥381,857M and Taiwan ¥300,932M. Non-current assets: Japan ¥1,658,950M, North America and Europe ¥1,986M, Asia ¥6,298M. Major customers: Apple group ¥476,014M (20.4%), with the Sandisk and Dell groups omitted for the year as each fell below 10% of sales. Flash Partners Ltd., Flash Alliance Ltd. and Flash Forward LLC are accounted for as joint operations with 50.1% of the voting rights and equal decision-making rights shared with Sandisk. Net interest-bearing debt ¥552,085M against equity of ¥1,398,929M — a net debt-to-equity ratio of 0.39 times, from ¥931,035M against ¥737,565M and 1.26 times a year earlier; USD-denominated senior notes at 6.25% (2030) and 6.625% (2033); goodwill of ¥395,585M from the 1 June 2018 acquisition of the former Toshiba Memory Corporation. Bain Capital funds indirectly hold 21.87% and Toshiba Corporation 17.59% of outstanding common shares, both having sold substantial holdings during the year. Risk factors state that the Yokkaichi Plant is located in an area with a high risk of earthquakes and floods and the Kitakami Plant in an area severely damaged by the 2011 Tohoku Earthquake, and name US-China trade frictions and US tariff policy among factors that may materially affect the business. The company does not provide plans or progress reports for the overall fiscal year. — year to 31 March 2026 · publ. 2026-06 · source ↗
  5. ReportedThe first is the supplier, which is the genuinely surprising one: the companies that sell goods to Walmart now also buy advertising from it — roughly $6.4 billion of it in fiscal 2026 — along with data analytics and insights.
    Marketing Dive - Walmart global advertising revenue of nearly $6.4 billion in fiscal 2026, up 46%, with Walmart Connect U.S. up 41% in the fourth quarter; advertising and membership fees accounted for about a third of fourth-quarter operating income — FY2026 · publ. 2026 · source ↗
  6. ReportedThe first is the supplier, which is the genuinely surprising one: the companies that sell goods to Walmart now also buy advertising from it — roughly $6.4 billion of it in fiscal 2026 — along with data analytics and insights.
    Walmart Form 10-K, fiscal year ended January 31, 2026 - Item 1 Business and Item 2 Properties (approximately 280 million customers a week across more than 10,900 stores in 19 countries; 2.1 million associates, 1.6 million in the U.S.; 4,611 Walmart U.S. retail units of which 3,728 owned, 601 Sam's Clubs of which 464 owned, 5,743 international stores of which 1,486 owned; 3,566 supercenters at 633,724 thousand square feet, 351 discount stores at 36,609, 694 neighborhood markets and small formats at 36,609/28,375 with a 42,000 average; 192 U.S. and 179 international distribution facilities, 149 owned; pickup and delivery at over 8,400 locations globally; EDLP and EDLC; private brands; competition; Flipkart and PhonePe majority stakes in 2018) — FY2026 (ended January 31, 2026) · publ. March 13, 2026 · source ↗
  7. ReportedMarketplace sales grew 52% in the June 2026 quarter.
    Walmart second-quarter fiscal 2027 earnings presentation (Form 8-K exhibit 99.2) - Walmart U.S. comp sales +2.6% with transactions excluding fuel +1.5% and average ticket excluding fuel +1.1% against total like-for-like inflation of 1.4%, and an approximately 125 basis point pharmacy headwind from maximum fair price regulation; eCommerce +24% including approximately 43% growth in store-fulfilled delivery, total advertising +38% including Walmart Connect +43%, and Marketplace sales +52%; expedited deliveries under three hours approximately 37% of store-fulfilled orders; share gains across categories and income tiers led by upper-income households — Q2 FY2027 · publ. August 20, 2026 · source ↗
  8. ReportedThe third is the payer standing behind the pharmacy counter — the benefit managers, insurers and government programmes that reimburse most of a $69,547 million health and wellness business and, since January 2026, set some of the prices outright.
    Walmart Form 10-K, fiscal year ended January 31, 2026 - consolidated financial statements and notes (total revenues $713,163M, net sales $706,413M, membership and other income $6,750M, cost of sales $535,395M, operating expenses $147,943M, operating income $29,825M, net income attributable to Walmart $21,893M, diluted EPS $2.73; balance sheet including inventories $58,851M, accounts payable $63,061M, property and equipment net $136,083M, accumulated depreciation $134,587M, depreciation and amortisation $14,203M; segment note; disaggregation of revenue by merchandise category and by market, and eCommerce net sales by segment) — FY2026 (ended January 31, 2026) · publ. March 13, 2026 · source ↗
  9. ReportedThe one line worth following is membership and other income, $6,750 million last year against $5,488 million two years before — the only line that measures a customer who has committed to anything.
    Walmart Form 10-K, fiscal year ended January 31, 2026 - consolidated financial statements and notes (total revenues $713,163M, net sales $706,413M, membership and other income $6,750M, cost of sales $535,395M, operating expenses $147,943M, operating income $29,825M, net income attributable to Walmart $21,893M, diluted EPS $2.73; balance sheet including inventories $58,851M, accounts payable $63,061M, property and equipment net $136,083M, accumulated depreciation $134,587M, depreciation and amortisation $14,203M; segment note; disaggregation of revenue by merchandise category and by market, and eCommerce net sales by segment) — FY2026 (ended January 31, 2026) · publ. March 13, 2026 · source ↗
Sources
Generated September 22, 2026