Is Costco a Buy After Its Latest Earnings Report?

Costco reported fiscal Q3 revenue of $70.52 billion, above the $69.81 billion consensus, with EPS of $4.93 versus $4.29 a year ago and net income up 15% to $2.19 billion. Fuel volumes hit record levels as gasoline prices rose, and membership fees increased 10.7% to $1.37 billion, but gross margin compressed 21 bps to 11.04% and the stock remains expensive at 48.5x forward earnings. The company also said tariff refunds would be used to lower prices rather than boost profits.

Analysis

The immediate beneficiary of higher fuel prices is not the fuel margin itself; it is the membership flywheel. Gas acts as a low-friction acquisition tool that changes shopping frequency and basket size, so the real upside is deferred CLV expansion rather than near-term P&L leverage. That matters because the market is still valuing COST as a high-quality retailer, not as a traffic arbitrage model with a self-reinforcing retention loop.

The bearish nuance is that inflationary traffic is not automatically high-quality traffic. As fuel, food, and transportation costs rise together, Costco can defend share by passing through lower prices, but that likely keeps gross margin capped while operating leverage stays muted. In other words, the macro impulse can support top-line resilience without creating the kind of earnings inflection needed to justify a premium multiple reset.

The second-order winner may be WMT, which can absorb price-sensitive consumers without the same incremental fuel-station catalyst, while COST’s upside becomes more dependent on members actually converting gas visits into warehouse spend. If gas stays elevated for months, the durability of the new-member cohort is the key variable; if prices normalize quickly, the supposed loyalty benefit can fade before it meaningfully changes unit economics.

Consensus may be underestimating how little tariff reimbursement changes the valuation setup: any cash recovery is economically fungible only if it can be retained, and management is signaling that competitive pass-through will likely nullify the benefit. The stock’s risk/reward looks asymmetric only if you believe gas-led retention produces a durable step-up in renewal rates over the next 2-4 quarters; otherwise, the premium multiple remains vulnerable to even modest disappointment in margin or comps.

Key Decisions for Investors

• Avoid initiating a fresh long in COST at current multiples; if owned, trim on strength into the next 1-2 quarters unless there is evidence that gas-driven first-time users are converting into higher warehouse spend and renewals.
• Pair trade: long WMT / short COST for 3-6 months. Thesis: WMT captures defensive demand without relying on fuel-driven traffic; COST is already priced for near-perfect execution and has less margin flexibility.
• Sell out-of-the-money COST puts 2-3 months out only if you want exposure to a pullback/reversion trade. Risk/reward is attractive if the market starts to question whether elevated fuel prices are a traffic tailwind or a margin tax.
• Monitor COST renewal rates and same-store basket composition over the next two earnings prints. If new gas customers lift renewals but not basket size, the equity rerating case weakens materially.
• For macro hedging, keep a small long consumer-discretionary basket hedge against COST exposure; sustained fuel inflation can preserve revenue but pressure aggregate household spend, capping upside for retailers with elevated valuation multiples.