Costco’s Membership Loyalty Hides a Critical Risk: Can Growth Keep Up With Shifting Shopper Behavior?

The official report shows a strong headline. For the quarter ended February 15, Costco's net sales hit $68.24 billion, a solid 9.1% jump from last year. Earnings per share were $4.58, up 13.9%. On the surface, that looks like a win. But the real story for a retailer is what shoppers are actually doing in the aisles. That's where the comparable sales figure comes in. The company's total comparable sales rose 7.4% for the quarter, a healthy gain that suggests people are not just looking, but buying.

Then there's the $1.36 billion in membership fees, which grew 13.6% year-over-year. That's a powerful signal. When people keep paying their dues and even upgrade to executive memberships, it shows they see real value and are committed to coming back. The company's renewal rate of 92.1% in the U.S. and Canada is a testament to that brand loyalty.

So the numbers say growth is happening. But the common-sense check is this: Is the growth driven by more people shopping, or just by higher prices? The report hints at both. Average ticket prices rose 4.2%, and traffic grew 3.1%. That mix-more shoppers and bigger baskets-feels like the kind of sustainable demand that builds a durable business. The big question now is whether this momentum can hold as the economy shifts. For now, the baseline is clear: Costco's shoppers are still buying.

Kick the Tires: What's Really Happening in the Aisles

The numbers look good, but let's kick the tires. A 22.6% surge in digital sales is impressive, but is it truly adding new members or just shifting purchases online? The company itself notes that younger members renew at lower rates, which is a potential red flag for future revenue stability. If the digital growth is pulling from existing members who are just moving their shopping online, it doesn't build the same durable, fee-paying customer base as a new shopper joining the club.

Then there's the 3.1% increase in global store traffic. That's a positive sign, but what are shoppers actually doing? Are they buying more per trip, or are they just visiting more often? The report shows average ticket prices rose 4.2%, which suggests bigger baskets. But the real test is whether that spending is driven by genuine need or just the "treasure hunt" atmosphere. When people are spending more on each trip, it usually means they're finding value they didn't expect.

The bottom line is that Costco's model relies on two things: people coming in and people paying to keep coming back. The high renewal rate is a strong signal of loyalty, but the observation about younger members is a caution. The digital growth is a bright spot, but it needs to be measured against the health of the core membership engine. For now, the traffic and digital numbers pass the smell test. The real-world utility of the warehouse experience seems to be holding up. But the sustainability of that growth, especially as the economy shifts, will depend on whether new shoppers keep signing up and whether younger members stay committed long-term.

The Financial Engine: How Growth Actually Works

The real test of any business model is how it turns sales into profits. In Costco's case, the math is working exceptionally well. For the quarter, net sales grew 9.1%, but earnings per share jumped 13.9%. That gap is the hallmark of strong operating leverage, and it's powered directly by the membership model. The company's heavy investment in international expansion and digital is paying off, and the financial engine is humming.

Look at the numbers. The company is adding new warehouses at a steady clip, with plans for 28 net new warehouses for fiscal 2026. That's a tangible bet on future growth. Simultaneously, its digital arm is surging, with digitally enabled sales up 22.6% for the quarter. These aren't just vanity metrics; they're building a dual engine for revenue. The digital growth is pulling in new customers and adding convenience, while the physical expansion brings in new members and drives traffic to the core warehouse experience.

The market is clearly buying this story. Costco's stock has gained 16.86% year-to-date, a strong move that reflects investor confidence in this growth path. The stock's climb shows the market sees the investments in stores and online as a real-world utility that compounds over time, not just a cost.

The bottom line is that Costco's model is built for efficiency. More members mean more predictable fee income, which funds expansion and digital upgrades. Those upgrades then attract more shoppers, both online and in stores, boosting sales. The 13.9% EPS growth outpacing the 9.1% sales growth proves the system is working. It's a virtuous cycle where each dollar spent on growth generates more than a dollar in profit. For now, the engine is firing on all cylinders.

What to Watch: The Next Real-World Test

The story is clear for now, but the next few months will tell if it's built to last. The real-world test is simple: are shoppers still buying, and are they coming back? The next quarter's comparable sales numbers, especially in the U.S. and the digitally-enabled segment, need to be watched closely. The 7.4% growth rate is solid, but the trend from the first 24 weeks of the year-where the total company rate dipped to 6.5%-shows it can slow. If the next report shows a similar deceleration, it would signal the initial post-hike momentum is fading.

More importantly, monitor the health of the membership engine. The company's renewal rate of 92.1% in the U.S. and Canada is a powerful signal of loyalty, but the note that renewal rates were slightly lower than a year ago is a leading indicator. This is where the "K-shaped" consumer trend becomes a risk. Costco's model thrives on the wealthier, value-seeking shopper. If economic conditions worsen and that cohort cuts back on discretionary spending, the brand's resilience could be tested. The company's own data shows younger members renew at lower rates, which could accelerate if their financial situation tightens.

The biggest risk is a slowdown in discretionary spending. The "treasure hunt" atmosphere and Kirkland brand loyalty are strong, but they rely on people feeling confident enough to spend. If the broader economy shows signs of strain, the growth in traffic and average ticket price could stall. The digital sales surge is a bright spot, but it needs to be measured against the health of the core membership base. For now, the numbers pass the smell test, but the next real-world check will be in the coming quarters' traffic and renewal rates.