research report · COST

Costco Wholesale Corp

Johannes Vermeer, Woman Holding a Balance, c. 1664, detail · National Gallery of Art

Viridis’s deep research report, written Oct 11, 2026 from its annual report (10-K for the year ended Aug 30, 2026, filed Oct 7, 2026). Written and checked with Anthropic’s Claude models.

your email, no card; what you get

business trajectory

Improving

better on balance: sales, margins, cash or competitive position

financial resilience

Strong

can meet its obligations and fund its plan for two years with money it can count on, with room

Judgments of the business from its filings, not of its shares: no valuation, no advice.

bottom line

Costco ended fiscal 2026 (52 weeks to August 30, 2026) larger, more profitable and richer in cash. Net sales rose 10% to $297.2B, operating income rose 12.5% to $11.7B (my calculation), and operating cash flow of $15.8B paid for capex, dividends and buybacks with about $6.1B left over. The headline runs ahead of the underlying engine. Higher gasoline prices added $3.5B to sales, comparable sales excluding gas and currency slowed to 7% from 8%, and paid-member growth slowed to 3.8% just as the 2024 fee increase stopped adding to growth. Funding risk is negligible. What decides the trajectory is whether member traffic and member growth hold up without those tailwinds.

in the full report

Its findings, each with the evidence, the strongest counterpoint and what would prove it wrong:

  • Underlying demand is solid, but gasoline flatters the headline and adjusted growth slowed
  • Membership, the profit anchor, is decelerating as the fee increase laps
  • Cash comfortably funds a 17% capex step-up, though suppliers helped
  • Tariff refunds add a one-off FY2027 lift, with a legal tail

Then its finances, the quality of its earnings, its management, the case for and against, and what to watch, its claims cited to the filings and checked against them.

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