COSTCO: The $1,000 stock that nobody thought was an AI trade

Let’s start with the number that got everyone talking.

Costco closed above $1,008 a share on May 8, 2026. For a company that sells bulk toilet paper and $1.50 hot dogs, that’s a psychological milestone that would have sounded absurd five years ago. But here’s the thing. This isn’t just a pandemic-era sugar rush that never corrected. Costco is up 17% year-to-date, even as the S&P 500 has fallen over 3% in the same period. Investors aren’t buying a grocery store. They’re buying something else entirely.So what exactly is going on?

The April sales print was the match that lit the fuse

On May 6, Costco dropped its monthly sales update, and it was a good one. The company reported net sales of $23.92 billion for the four weeks ended May 3, 2026, up 13% from $21.18 billion in the same period last year. Total comparable sales rose 11.6% for the month, and digitally-enabled comparable sales climbed 18.8%. 

Now, some of that pop came from an extra shopping day in April due to the Easter calendar shift. The Easter holiday timing threw extra fuel on the fire, lifting total and comparable sales by roughly 1.5 to 2%. Fair enough. But even stripping that out, April’s adjusted total company comps still rose 7.8%, with digital comps up 18.4%. That is a step up from the 6.4% adjusted figure in January and the 6.2% reported in March. 

The trend is not a one-month fluke. Over the first 35 weeks of the fiscal year, total company comparable sales rose 7.8% and digitally-enabled comparable sales increased 21.6%. Month after month, the digital channel is running hot.

The membership machine nobody talks about

To understand why Wall Street is paying 53 times trailing earnings for a warehouse club, you have to understand that Costco is not actually a retailer.

Costco is primarily a membership subscription business that happens to operate retail stores. The product is almost irrelevant. The membership fee is the whole game. 

Costco generated $5.3 billion in membership fee revenue in fiscal 2025, with renewal rates holding above 92% in the United States and Canada following its first fee increase in seven years. Almost all of that fee income flows directly to the bottom line, which is what allows a retailer running on 12.9% gross margins to compound earnings consistently. 

Think about that. A company with razor-thin retail margins is able to justify a tech-stock valuation purely because people keep renewing their memberships at a 92% clip, year after year. Executive memberships now drive 75.8% of sales. The stickiest customers are also the biggest spenders. 

Now here comes the AI part

This is where the story gets interesting, and where most people are not paying attention.

Costco has been intensifying its investment in artificial intelligence and digital technologies as part of a broader transformation strategy aimed at improving member experience, boosting e-commerce growth, and strengthening operational efficiency. 

The most visible piece is personalization. Q2 already saw $470 million in e-commerce sales attributed to AI-powered personalized recommendation carousels. That is not a pilot program. That is a real revenue line with a dollar amount attached to it. 

But the AI play goes much deeper than a shopping carousel. The retailer uses machine-learning demand forecasting in its bakery operations to predict daily production levels, helping reduce waste and improve inventory management for perishable goods. Costco also hired a dedicated Chief Information Technology Officer to oversee AI implementation, and has a collaboration with Nvidia where they’re using supercomputers to screen drugs much faster.

Unlike the splashy AI announcements from tech-forward retailers, Costco’s embrace of AI lacks fanfare but delivers measurable results. The AI learns from patterns across all locations, creating a network effect where each new warehouse makes the entire system smarter. 

This is the Costco playbook applied to AI. Quiet. Relentless. Compounding.

And the international engine is just warming up

The two revenue drivers for the long-term are warehouse expansion into underpenetrated international markets, where March comps ran above 11% internationally versus 8.7% in the U.S., and sustained same-store sales growth as Costco’s value proposition draws traffic in a tight consumer environment. 

Management plans roughly 28 net new warehouses in FY26 to reach 942 locations, with more than 30 annually expected over the long run. Every new warehouse is also a new data point for the AI systems, improving forecasting across the entire network. 

So is it a buy?

Here’s where we have to be honest with you.

The stock trades at a 52x trailing P/E and roughly 46x on a forward basis, with a PEG of 5 and price-to-book near 14. That is one of the richest multiples in retail. 

The bear case takes shares to around $968 over the next year, a modest drawdown, while the bull case projects $1,124 by May 2027, a roughly 13% total return. 

Adding to the caution, University of Michigan consumer sentiment fell to a record low of 48.2 in May 2026. Insiders have also been trimming: four executive vice presidents sold stock between March 9 and April 1, 2026, at prices between $991 and $1,003. 

And Costco CEO Ron Vachris said during the most recent earnings call that “the future impact of tariffs remains extremely fluid.” About a third of its U.S. sales come from imported goods, so that is a real risk, not a talking point. 

The bottom line: Costco at $1,033 is a bet that the membership flywheel keeps spinning, that AI-driven personalization turns digital comps from impressive to structural, and that 30 new warehouses a year keep compounding quietly into new markets. The stock is not cheap. It has never been cheap. And historically, that has not been a good reason to avoid it.

The hot dog is still $1.50. Everything around it has changed.

This is not financial advice. Do your own research before making investment decisions.