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Walmart (WMT) — moat facet

Four rivals attacking one edge each — channel, model, price, proximity — and not one of them taking the whole trip.

Walmart's competitive position is unusual in that it is not really contested by anybody trying to be Walmart. The last serious attempt at a national supercenter chain ended decades ago, and the field that exists today is made of companies attacking one edge of the model each while conceding the middle.

Four rivals, four different edgesAmazon - the channel37.8% of U.S. eCommerce against 6.3%Costco - the model~$295m per warehouse against $104.7m per storeAldi - the price2,000 items against 120,000Dollar General - the distance20,942 stores against 4,611Nobody has takenthe whole tripWalmart U.S. comparable sales +2.6%, or about 3.9% before the pharmacy headwind.
Each competitor is better than Walmart at a part of the trip and worse at the combination, which is the thing Walmart actually sells.

There are four such edges, and they are genuinely different in kind. Amazon has taken the online channel — about 37.8% of American eCommerce against Walmart's 6.3%1 — and has spent twenty years failing to take the grocery trip, where it holds roughly 2.8% of the market against Walmart's 23.6%2. Costco has taken a slice of the household's planned, bulk spending with a model Walmart cannot copy without dismantling itself, and it earns a higher return doing it. Aldi has taken the price comparison on a staples basket, by carrying two thousand items instead of a hundred and twenty thousand, and is opening more than 180 American stores in 20263. Dollar General has taken proximity, with 20,942 stores in 48 states4 — more than four times Walmart's American count — in towns too small for a supercenter.

What none of them has taken is the whole trip. That is the thing Walmart sells: groceries, a prescription, a birthday present and motor oil, at one stop, at a price nobody assembles more cheaply across the entire basket. Each competitor is better than Walmart at a part of that, and worse at the combination.

Walmart's own filing lists the field without much ceremony, and the list is longer than any of its rivals': discount, department, retail and wholesale grocery, drug, dollar, variety and specialty stores, supermarkets, supercenters, membership clubs, gasoline stations, "social commerce platforms", and companies offering digital advertising, fulfilment and delivery services, health and wellness and financial services5. The company is now competing in every one of those categories because it has entered every one of them.

The direction of travel favours Walmart at the moment, and the evidence is share rather than assertion: gains reported across categories and income tiers, led by upper-income households6, while the conventional supermarkets lose ground. What complicates the picture is that the share is being won in groceries and lost, or at least not won, in general merchandise — $115,060 million against $113,985 million two years earlier7 — which is the category the specialists and the marketplaces are taking.

What tests this aspect is Walmart U.S. comparable sales against the categories the competitors occupy. It was 2.6% in the June 2026 quarter, or about 3.9% before a pharmacy regulation nobody in the competitive set caused8.

Moat trajectory: Holding steady

Walmart is winning the competitive contest that matters most to it — grocery share, share across income tiers — and losing, or at least not winning, the one that matters most to its margin, which is general merchandise. The field has not changed shape in several years: Amazon owns the channel, Costco the model, Aldi the price, the dollar chains the distance.

The number that tests this moat
Reported
Walmart U.S. comparable sales
+2.6%, or about 3.9% before the pharmacy headwind

Growth led by transactions rather than ticket, with share gains reported across categories and income tiers. The competitive set is taking the edges - channel, model, price, proximity - and nobody is taking the whole trip.

Source: Walmart second-quarter fiscal 2027 results (August 20, 2026) ↗
Dig deeper
DIG DEEPER 01
Amazon: Twenty Years and Still Not a Grocer
Two companies converging on the same model from opposite ends, and stores are more expensive to build than websites.
DIG DEEPER 02
Costco: The Rival That Charges Admission
Costco earns a better living out of the same square feet, and Walmart cannot copy it without ceasing to be Walmart.
DIG DEEPER 03
Aldi: The Contest Walmart Does Not Win
Price leadership is a belief formed on the twenty items a shopper checks, and a discounter who wins those twenty wins the belief.
DIG DEEPER 04
Dollar General: Four Times as Many Stores
The competitor is not cheaper. It is closer, and the relevant cost includes the drive.
References
  1. Third-party estimateAmazon has taken the online channel — about 37.8% of American eCommerce against Walmart's 6.3% — and has spent twenty years failing to take the grocery trip, where it holds roughly 2.8% of the market against Walmart's 23.6%.
    U.S. e-commerce market share estimates — Amazon ~37.8% of U.S. e-commerce against Walmart ~6.3% — 2026 · publ. 2026 · source ↗
  2. Third-party estimateAmazon has taken the online channel — about 37.8% of American eCommerce against Walmart's 6.3% — and has spent twenty years failing to take the grocery trip, where it holds roughly 2.8% of the market against Walmart's 23.6%.
    5W Grocery Retail AI Visibility Index 2026 (PR Newswire) - U.S. grocery market share: Walmart 23.6%, Kroger 10.1%, Costco 9.2%, Albertsons 6.4%, Aldi 3.5%, Amazon/Whole Foods 2.8%; the top ten chains hold about 70% of the market — 2026 · publ. 2026 · source ↗
  3. ReportedAldi has taken the price comparison on a staples basket, by carrying two thousand items instead of a hundred and twenty thousand, and is opening more than 180 American stores in 2026.
    ALDI US (PR Newswire) - plans to open more than 180 new U.S. stores in 2026, taking the footprint to nearly 2,800, within a programme lifting total U.S. investment to $9 billion by 2028 and targeting close to 3,200 stores — 2026 · publ. January 2026 · source ↗
  4. Third-party estimateDollar General has taken proximity, with 20,942 stores in 48 states — more than four times Walmart's American count — in towns too small for a supercenter.
    Dollar General store count - 20,942 stores in 48 states as of February 27, 2026, with approximately 450 new U.S. stores planned for fiscal 2026 — 2026 · publ. 2026 · source ↗
  5. ReportedWalmart's own filing lists the field without much ceremony, and the list is longer than any of its rivals': discount, department, retail and wholesale grocery, drug, dollar, variety and specialty stores, supermarkets, supercenters, membership clubs, gasoline stations, "social commerce platforms", an
    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 ↗
  6. ReportedThe direction of travel favours Walmart at the moment, and the evidence is share rather than assertion: gains reported across categories and income tiers, led by upper-income households, while the conventional supermarkets lose ground.
    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 ↗
  7. ReportedWhat complicates the picture is that the share is being won in groceries and lost, or at least not won, in general merchandise — $115,060 million against $113,985 million two years earlier — which is the category the specialists and the marketplaces are taking.
    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 ↗
  8. Moat Explorer calcIt was 2.6% in the June 2026 quarter, or about 3.9% before a pharmacy regulation nobody in the competitive set caused.
    Moat Explorer calculation from figures in Walmart's own filings: global eCommerce of about $150.4 billion (Walmart U.S. $99.6B + International $35.8B + Sam's Club $15.0B) against $120.9 billion, a $29.5 billion increase against a $31,875M rise in net sales ($706,413M against $674,538M), about 92%; Walmart U.S. selling floor of 698.7 million square feet (633,724 + 36,609 + 28,375 thousand) and net sales per store of $104.7 million ($482,975M over 4,611 stores); operating margin 4.18% ($29,825M/$713,163M) against 4.31% ($27,012M/$648,125M); net margin 3.07%; gross profit rate 24.2% ($171,018M/$706,413M); grocery 59.1% of Walmart U.S. net sales ($285,482M/$482,975M) against 59.8% ($264,210M/$441,817M) and grocery growth of 3.4%; general merchandise to grocery ratio 0.40 against 0.43; health and wellness +26.7% ($54,898M to $69,547M); payables less inventories $4,210M ($63,061M less $58,851M); rent 0.34% of revenue ($2,434M/$713,163M); capital expenditure 64% of operating cash flow ($26,642M/$41,565M); a 1% overrun on $147,943M of expense is $1,479M; eCommerce penetration 27.5% international ($35.8B/$130,423M) and 20.6% at Walmart U.S. ($99.6B/$482,975M); shareholder returns $15,587M ($7,507M dividends plus $8,080M repurchases) against $14,923M of free cash flow; Q2 FY2027 net income attributable down 9.4% ($6,366M against $7,026M); Walmart U.S. comparable sales of about 3.9% excluding the 125 basis point pharmacy headwind — FY2024-Q2 FY2027 · publ. September 2026 · source ↗
Sources
Generated September 22, 2026