Four Per Cent as a DeterrentWide moat

Walmart (WMT) — moat facet

A competitor does not have to beat Walmart's margin. It has to build a cost structure that survives one.

The most underrated defensive weapon in retailing is a low margin, and Walmart runs one of the lowest in large-scale retailing at 4.18%. The businesses that run lower get there by carrying a few thousand items rather than a hundred and twenty thousand.

Operating margin, FY2026 (%)Walmart U.S.5.2%Walmart consolidated4.2%Walmart International3.9%Sam's Club U.S.2.6%Every segment runs on single-digit margins; the consolidated figure is 4.18%.
A rival does not have to beat four per cent. It has to build a cost structure that survives one, while carrying a hundred and twenty thousand items.

The logic runs backwards from the usual. A competitor entering Walmart's categories is not trying to beat a 4.2% operating margin; it is trying to build a cost structure that survives one. Every conventional retailer, every start-up with venture funding, every supplier considering selling direct has to answer the same question: can you run this at four cents on the dollar? Almost nobody can, and the few who can — the hard discounters, the clubs — get there by refusing to carry the assortment.

This is why Walmart's profitability should not be read as underperformance. The company generated $29,825 million of operating income on $713,163 million of revenue in fiscal 20261. Raising the margin to a supermarket's typical level would add many billions of profit and would also invite exactly the competitive entry the low margin prevents. Walmart has had sixty years to make that trade and has consistently declined.

The catch is that a deterrent only deters people who need a return. It does not deter a rival with a different objective — a marketplace subsidised by advertising, a Chinese platform selling factory-direct at no margin at all, a dollar chain that is not trying to sell the same basket. The 4.2% keeps out rational competitors, which is most of them, and not the others.

And it leaves nothing in reserve. At three cents of net margin2, a bad year in one category or one region moves earnings in a way it would not at a company earning fifteen.

The operating margin itself is the test: 4.18% in fiscal 2026 against 4.31% two years earlier3. If it rises materially, either the mix has shifted to advertising and membership — which is the bull case — or Walmart has started harvesting, which is the beginning of the end of this facet.

Moat trajectory: Holding steady

The operating margin has moved within a narrow band for years and there is no sign of either harvesting or erosion. The deterrent keeps working against competitors who need a return and continues not to work against the ones funded from elsewhere, which is the same situation as five years ago.

The number that tests this moat
Moat Explorer calc
Net margin
3.07% of revenue

$21,893M of net income attributable to Walmart on $713,163M. A competitor does not have to beat that margin, it has to survive one, and almost nobody can while carrying the assortment. It also leaves nothing in reserve for a bad year.

Source: Moat Explorer calculation from the FY2026 Form 10-K ↗
⚠ Threats to the moat
⚠ THREAT 01
The Deterrent Only Works on People Who Want a Margin
It keeps out rational competitors, which is most of them, and precisely not the ones taking general merchandise.
References
  1. ReportedThe company generated $29,825 million of operating income on $713,163 million of revenue in fiscal 2026.
    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 ↗
  2. Moat Explorer calcAt three cents of net margin, a bad year in one category or one region moves earnings in a way it would not at a company earning fifteen.
    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 ↗
  3. Moat Explorer calcThe operating margin itself is the test: 4.18% in fiscal 2026 against 4.31% 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