Key Highlights

  • Revenue growth: Costco reported double-digit sales growth in fiscal Q3 2026, with quarterly Revenue around $70 billion.
  • Membership strength: The membership renewal rate remained above 90%, and membership fee income grew at a double-digit rate.
  • Business model: Costco earns a large share of profit from annual membership fees rather than markups on low-margin goods.
  • Defensive quality: Costco's steady Demand through economic cycles offers ballast to a Nasdaq 100 benchmark dominated by technology names.

Costco (NASDAQ:COST) thrives precisely when shoppers become careful with money, and that counter-cyclical quality is why its membership model matters so much to Nasdaq 100 investors. As households hunt for value, Costco's promise of low prices in exchange for an annual fee becomes more appealing, not less, giving the company a resilience that many retailers lack.

What Costco Does

Costco is a warehouse-club retailer that sells groceries and general merchandise in bulk at low margins. It sits in the consumer-staples sector. Its Business model is unusual: it makes a large share of its profit not from selling goods but from the annual fees members pay for the right to shop there. That structure aligns the company with its customers, since it can keep product prices razor-thin and still earn healthy profits from membership.

Fees Do the Heavy Lifting

The most recent results underline the model's strength. In its third quarter of fiscal 2026, reported in late spring, Costco delivered double-digit sales growth, with quarterly revenue around 70 billion US dollars, and membership fee income rising at a double-digit rate. Crucially, its membership renewal rate remained very high, above 90 per cent, showing that shoppers see enough value to keep paying. Because Costco's financial year ends in early September, its fiscal 2026 largely tracks the past year of trading, a detail worth noting when comparing it with other retailers.

Why it Matters for the Nasdaq 100

Costco brings defensive, consumer-staples exposure to a benchmark dominated by technology. Its results are a useful read on the health and behaviour of the middle-class consumer: steady membership growth and high renewals suggest households remain willing to spend on value. For a fund tracking the index, Costco offers a measure of ballast, a business whose demand is relatively stable through economic cycles, which can offset the Volatility of the technology names that dominate the Nasdaq 100.

The Risks to Weigh

Costco's margins are deliberately thin, so it depends on Volume and membership growth rather than mark-ups, leaving little cushion if costs rise. Its valuation has become rich for a retailer, which raises expectations and the risk of disappointment. It is exposed to wage inflation, tariffs on imported goods and shifts in consumer confidence. Expansion into new markets carries execution risk. And any slip in the renewal rate, however small, would raise questions about the durability of the model that underpins its profits.

The Discipline Behind the Model

What makes Costco unusual is the discipline that sustains the model. The company deliberately limits the number of products it stocks, buys in vast quantities and passes most of the savings to members, accepting thin margins in exchange for loyalty and volume. That restraint is difficult for rivals to copy, because it requires forgoing the higher mark-ups that most retailers rely on. It also builds trust: members keep renewing because they believe Costco is genuinely working to lower their costs. In an age when many retailers chase short-term profit, that patient, member-first approach is the quiet engine behind the company's remarkable consistency.

What to Watch Next

Readers should follow comparable sales, which show underlying demand, and membership fee income, the true engine of profitability. The renewal rate is the single most important indicator of the model's health, so any change deserves attention. News of membership fee increases, which Costco raises only occasionally, can lift profits meaningfully and is worth watching. Commentary on tariffs and costs reveals how the company is protecting its low prices. Finally, keep the valuation in mind, because Costco's quality is widely recognised and already reflected in its share price, meaning the stock can struggle to make progress even when the business itself continues to perform exactly as investors have come to expect, quarter after quarter, over the long course of many patient years.

Thin Margins, Loyal Members

Costco's model works precisely because it refuses to chase the easy profit that thinner discipline would allow. By keeping prices low and relying on membership loyalty rather than markups, it has built a business that is difficult to imitate and, so far, difficult to dislodge. The risk for investors is less about the company's execution than about a valuation that already assumes this consistency will continue indefinitely.