The DepotsNarrow moat

Costco Wholesale (COST) — moat facet

Goods move through rather than sit, which is why 32 million square feet of logistics supports 135 million of selling floor.

Most retailers store. Costco routes. The company buys most merchandise directly from producers and sends it either straight to a warehouse or through a cross-docking depot, whose depots "receive large shipments from suppliers and quickly ship these goods to warehouses"1. Goods are broken down and reconsolidated rather than put away, so the depot is a sorting floor rather than a store cupboard.

Floor space, FY2025 (million sq ft)134.7mSelling floor32.2mDistribution and logisticsAbout one square foot of back-end per four of front-end, because goods cross-dock rather than sit.
Most retailers store; Costco routes. Large shipments arrive at a depot and leave the same way, which the 10-K credits with 'freight volume and handling efficiencies'.

The scale ratio tells the story. Distribution and logistics facilities total about 32.2 million square feet against 134.7 million square feet of selling floor2 — roughly one square foot of back-end for every four of front-end. A conventional grocer with a comparable footprint needs far more, because it holds weeks of stock for tens of thousands of items across many pack sizes.

Two features of the assortment make this possible. Fewer than 4,000 items means fewer flows to coordinate. And selling in case, carton or multiple-pack quantities only, straight from the pallet, means the merchandise arrives in the form it will be sold in — no repacking, no relabelling, no picking. The 10-K's own phrase for the benefit is "freight volume and handling efficiencies".

The result appears in two places. It is part of why inventory turns roughly thirteen times a year3, and part of why the selling floor can be a plain box with racking above it rather than a store with a stockroom behind it.

The vulnerability is symmetrical: a system with almost no buffer stock has almost no shock absorber. Costco's own risk factors name it — disruptions "due to extreme weather, pandemics or other catastrophic events, labor issues, work stoppage, or other shipping problems may result in delays"4 — and 2020 demonstrated it in public.

Moat trajectory: Holding steady

The cross-dock ratio and the inventory turn have been steady for years. E-commerce fulfilment is the piece that does not fit the model, and it is still small.

The number that tests this moat
Reported
Distribution floor space against selling floor space
32.2 million square feet against 134.7 million

Roughly one square foot of back-end per four of front-end, because goods cross-dock rather than sit. It is also why there is almost no buffer stock when something goes wrong.

Source: Costco Form 10-K, fiscal year ended August 31, 2025 ↗
⚠ Threats to the moat
⚠ THREAT 01
A System With No Slack Has No Slack
Twenty-eight days of stock is an efficiency in a normal year and an empty aisle in an abnormal one — and an empty aisle here is a debit against a fee.
References
  1. ReportedThe company buys most merchandise directly from producers and sends it either straight to a warehouse or through a cross-docking depot, whose depots "receive large shipments from suppliers and quickly ship these goods to warehouses".
    Costco Form 10-K, fiscal year ended August 31, 2025 - Item 1 Business (membership counts and renewal rates, warehouse and gas-station counts, under 4,000 SKUs, Executive tier and the 2% reward, human capital and wages, competition, Kirkland Signature) — FY2025 · publ. October 8, 2025 · source ↗
  2. ReportedDistribution and logistics facilities total about 32.2 million square feet against 134.7 million square feet of selling floor — roughly one square foot of back-end for every four of front-end.
    Costco Form 10-K, fiscal year ended August 31, 2025 - Item 2 Properties (725 warehouses with owned land and building, 141 land-only leases, 134.7 million square feet of selling floor and 32.2 million of distribution) — FY2025 · publ. October 8, 2025 · source ↗
  3. Moat Explorer calcIt is part of why inventory turns roughly thirteen times a year, and part of why the selling floor can be a plain box with racking above it rather than a store with a stockroom behind it.
    Moat Explorer calculation: FY2025 merchandise costs of $239,886M over average merchandise inventories of about $18,382M gives roughly 13 inventory turns (about 28 days); accounts payable of $22,363M over inventories of $19,418M gives 115% at Q3 FY2026 — FY2025 and Q3 FY2026 · publ. September 2026 · source ↗
  4. ReportedCostco's own risk factors name it — disruptions "due to extreme weather, pandemics or other catastrophic events, labor issues, work stoppage, or other shipping problems may result in delays" — and 2020 demonstrated it in public.
    Costco Form 10-K, fiscal year ended August 31, 2025 - Item 1A Risk Factors (U.S. and Canada 86% of net sales and 84% of operating income, California 26% of U.S. net sales, cannibalisation, tariffs, supplier and site-acquisition risk, 'high market expectations') — FY2025 · publ. October 8, 2025 · source ↗
Sources
Generated September 23, 2026