Costco's AI investments generated triple-digit growth in e-commerce traffic and contributed nearly $500 million in digital sales during the fiscal third quarter of 2026, the retailer disclosed in its May earnings call. The results show AI-sourced traffic now converting at the highest rate among all digital channels, signaling that the warehouse club's practical focus on product discovery is yielding measurable returns.
CFO Gary Millerchip explained that the company optimized product pages to make bundled offerings visible to large language models and AI search platforms. "We have got a good value on appliances, a very good everyday value, but our real big value is in an all-in pricing," Millerchip said. "Our prices include delivery, installation, and haulaway. Regular search did not show all that value." The same shortfall applied to tire services, where installation is included in the price-a detail traditional search engines failed to surface effectively.
Personalization contributes $500 million in digital sales
Separately, AI-powered personalized product recommendation carousels on Costco.com generated just under $500 million in digital sales during the quarter. Those recommendations delivered conversion rates three times better than the company's typical e-commerce performance. Costco's success with recommendation carousels exemplifies why executives increasingly view AI for Marketing as a high-ROI investment-conversion rates three times the company average directly lifted digital sales.
AI traffic becomes highest-converting channel
The volume of AI search-generated traffic remains modest compared to established channels, but its conversion advantage is clear. CEO Ron Vachris said Costco is "working with the leading AI companies to improve the visibility of our values to current and potential future Costco members." He added, "We believe AI is changing how consumers research products, and has the potential to be a significant opportunity for Costco given our pricing authority and our focus on quality."
Broader industry data support Costco's early returns. Adobe reported that AI referral traffic to U.S. retail sites surged 393% year-over-year in the first quarter of 2026, and multiple e-commerce research firms find AI-referred sessions convert at four to five times the rate of traditional organic search.
Why this matters for executives and strategy
Costco's approach shows that AI investments focused on real business friction-making complex offers like all-in pricing findable by AI-can produce best-in-class conversion rates without flashy applications. The $500 million personalization contribution and the elevation of AI traffic to the highest-converting channel both demonstrate that the technology is moving from promise to P&L impact. The results provide a clear template for leaders exploring AI for Executives & Strategy: focus the technology on concrete revenue levers, benchmark against traditional channels, and collaborate directly with the platforms where customers are increasingly doing their research.
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