Costco Wholesale kept ringing up sales gains through the quarter ended May 10, 2026, even as broader U.S. retail spending showed signs of cooling. The company’s latest quarterly filing with the Securities and Exchange Commission details continued growth in merchandise revenue and membership-fee income during a stretch when government data pointed to softer results across much of the retail sector. The split between Costco’s trajectory and the wider pullback raises a pointed question: what makes its 130-million-plus cardholders behave differently from shoppers elsewhere?
Why the warehouse club keeps growing while other retailers slow
The tension is straightforward. The U.S. Census Bureau published its advance monthly sales estimates for May 2026, and the headline figures showed year-over-year gains for retail and food services that were weaker than the pace set earlier in the year. Department stores, specialty apparel, and electronics chains have all flagged cautious consumers in recent earnings calls. Against that backdrop, Costco’s quarterly results moved in the opposite direction.
One explanation centers on how Costco’s members use the store. A large share of warehouse-club spending goes toward groceries, household staples, and consumables purchased in bulk. These are items people buy regardless of economic mood. When a household treats Costco as its primary pantry, cutting back means switching brands or trimming quantities, not skipping trips entirely. That pattern would show up first in steady or rising traffic on staple categories, even if spending on discretionary goods softened across the rest of the retail sector. The quarterly filing captures exactly that dynamic: net sales rose, driven by higher traffic and a larger average transaction.
Costco’s 10-Q and Census data tell diverging stories
The strongest evidence sits in two primary documents. Costco’s Form 10-Q for the quarter ended May 10, 2026, filed with the SEC, reported that net sales increased, with both comparable-warehouse traffic and average ticket contributing to the gain. Deferred membership fees, a line item that reflects renewals paid in advance, also rose, signaling that cardholders are not just spending but recommitting to annual memberships at high rates.
The Census Bureau’s monthly retail trade data, drawn from its seasonally adjusted survey of thousands of businesses, tells the other side of the story. The advance release for May 2026 recorded a slower pace of growth for total retail and food services sales compared with the same month a year earlier. Warehouse clubs and supercenters as a category have outperformed the broader retail composite in the Census time series for several consecutive months, widening a gap that was narrower at the start of the year. That divergence is not a one-quarter blip; it reflects a structural difference in who shops at these stores and why.
Membership fees add another layer of insulation. Because Costco collects annual dues before a single item is scanned, it starts each quarter with a revenue floor that traditional retailers lack. High renewal rates mean that floor keeps rising, giving the company room to hold prices low on staples and absorb tariff-related cost increases without immediately passing them to shoppers. That pricing discipline, in turn, reinforces the habit loop: members keep showing up because the value proposition holds even when budgets tighten.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
