The Trip Nobody SkipsWide moat

Walmart (WMT) — moat facet

The reason 280 million people walk into a Walmart every week is not the televisions. It is the food.

The reason 280 million people walk into a Walmart every week1 is not the televisions. It is the food.

U.S. grocery market share, 2026 (%)Walmart23.6%Kroger10.1%Costco9.2%Albertsons6.4%Aldi3.5%Amazon / Whole Foods2.8%The top ten chains hold about 70% of the market between them.
Twenty years, Whole Foods and Amazon Fresh, and groceries remain 2.8% of the American market for Amazon against 23.6% for Walmart. It is the wall that has held.

Grocery was $285,482 million of Walmart U.S. net sales in fiscal 2026, 59% of the segment2, and Walmart holds roughly 23.6% of the American grocery market — more than twice the next largest chain, and more than eight times Amazon and Whole Foods combined3. That is the most consequential position in the company, and it is consequential for a reason that has little to do with the margin on a loaf of bread.

Groceries are bought weekly. No other category in retailing generates that frequency, and frequency is what turns a shop into a habit. A household that buys its food at Walmart passes the pharmacy counter fifty times a year, walks past the apparel, and is available to be sold a television when the old one fails. The food is the reason the customer is in the building; everything with a decent margin on it depends on the food being there.

This is also the wall Amazon has been unable to climb. Twenty years, Whole Foods, Amazon Fresh, and grocery remains about 2.8% of the American market4, because fresh food is heavy, perishable, low-margin and hostile to the parcel economics that made Amazon what it is. It is the one category where Walmart's physical estate is an unambiguous advantage rather than a legacy cost.

What has changed lately is who is doing the buying. Walmart reports share gains across income tiers led by upper-income households5 — the trade-down that began under inflation and has not reversed. An affluent customer who arrives for value and stays for convenience buys a different basket from the one Walmart was built for, which is visible in the growth of delivery and in the premium own-label push.

The risk sitting underneath all of it is that grocery is the worst margin in the store, and it is now a larger share of the store than it has ever been. Walmart U.S. earns 5.2% at the operating line6; a business that was three quarters food would earn considerably less, and the mix is moving that way.

What tests this facet is grocery's share of Walmart U.S. net sales: 59.1% in fiscal 2026 against 59.8% two years earlier7. The habit is the asset. The question is what else the habit is still selling.

Moat trajectory: Holding steady

Walmart's grocery position is as secure as any in this collection and is not getting more profitable. It holds roughly 23.6% of the American market against Amazon's 2.8% after twenty years of Amazon trying, and the trip still anchors everything else in the building. What offsets that is mix: food and pharmacy are taking a larger share of a business they do not fund.

The number that tests this moat
Third-party estimate
U.S. grocery market share
23.6%

More than twice the next largest chain and more than eight times Amazon and Whole Foods combined. Grocery is what generates the weekly trip that everything with a decent margin depends on. Watch grocery's share of Walmart U.S. net sales: rising would mean the trip is becoming a food run.

Source: 5W Grocery Retail AI Visibility Index 2026 ↗
Aspects of the moat
DIG DEEPER 01
Fifty-Nine Per Cent of It Is Food
The cheapest customer acquisition in retail: the customer acquires herself, fifty-two times a year.
DIG DEEPER 02
Two Hundred and Eighty Million People a Week
A search engine sees more people; it does not see them buy.
DIG DEEPER 03
The Pharmacy Counter
The fastest-growing category in Walmart's American business is the one whose prices somebody else now sets.
DIG DEEPER 04
The Customer Who Traded Down and Stayed
The most valuable customers Walmart has won in three years did not arrive because they liked Walmart.
⚠ Threats to the moat
⚠ THREAT 01
Grocery Is the Worst Margin in the Building
Walmart's greatest competitive strength and its weakest economics are the same category.
⚠ THREAT 02
The App Between Walmart and the Customer
The grocery habit is only Walmart's asset while Walmart owns the transaction.
References
  1. ReportedThe reason 280 million people walk into a Walmart every week is not the televisions.
    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. ReportedGrocery was $285,482 million of Walmart U.S. net sales in fiscal 2026, 59% of the segment, and Walmart holds roughly 23.6% of the American grocery market — more than twice the next largest chain, and more than eight times Amazon and Whole Foods combined.
    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 ↗
  3. Third-party estimateGrocery was $285,482 million of Walmart U.S. net sales in fiscal 2026, 59% of the segment, and Walmart holds roughly 23.6% of the American grocery market — more than twice the next largest chain, and more than eight times Amazon and Whole Foods combined.
    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 ↗
  4. Third-party estimateTwenty years, Whole Foods, Amazon Fresh, and grocery remains about 2.8% of the American market, because fresh food is heavy, perishable, low-margin and hostile to the parcel economics that made Amazon what it is.
    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 ↗
  5. ReportedWalmart reports share gains across income tiers led by upper-income households — the trade-down that began under inflation and has not reversed.
    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 ↗
  6. Moat Explorer calcWalmart U.S. earns 5.2% at the operating line; a business that was three quarters food would earn considerably less, and the mix is moving that way.
    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 ↗
  7. Moat Explorer calcWhat tests this facet is grocery's share of Walmart U.S. net sales: 59.1% in fiscal 2026 against 59.8% two years earlier.
    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