Costco has spent years as the quiet giant of retail — enormous in scale, deliberately restrained in flash. So when the warehouse club finally makes a serious move into retail media, it's worth paying attention to how it's doing it differently.
The company just unveiled a major upgrade to Costco Velocity, its retail media network, through a partnership with ad tech firm Moloco that brings AI-powered "digital endcaps" to Costco.com. It's the first new onsite advertising product built on the Costco Velocity stack, and it signals that even the most ad-averse retailer in America now sees retail media as essential infrastructure.
How It Works
The new Reserved Display format will appear on Costco.com's highest-traffic pages — the homepage and search results — serving personalized product recommendations based on actual shopper purchase behavior. As Supermarket News reported, Moloco's deep neural networks and operational machine learning analyze real purchase data to match products with shoppers, using real-time indicators to predict relevance.
Think of it as the digital equivalent of the physical endcap — that prime merchandising real estate at the end of every warehouse aisle — but powered by AI that knows what you've actually bought before, not just what you've browsed. Costco described the placements as designed to deliver "merchandising serendipity," helping shoppers discover products they didn't know they wanted.
Beta partners will get access in Q2 2026, with broader availability to follow. Additional ad slots and formats are planned for Q2 through Q3.
Why Costco, and Why Now
Costco has historically been cautious about advertising. The company's value proposition — low prices, curated selection, no-frills experience — makes aggressive ad placements risky. Push too hard and you undermine the trust that keeps 75 million households paying annual membership fees.
But the economics of retail media are now too compelling to ignore. As eMarketer noted, the platform represents Costco's effort to monetize its digital traffic without compromising the shopping experience. The choice of Moloco — an AI-native company rather than a legacy ad tech provider — suggests Costco is prioritizing relevance over volume. The system improves with each interaction, theoretically getting better at serving ads that feel like helpful recommendations rather than interruptions.
The timing isn't accidental either. Costco just posted a strong Q2, with net income rising 13.8% to $2 billion and net sales up 9.1% to $68.24 billion. When your core business is humming, you can afford to build new revenue streams thoughtfully rather than desperately.
The Broader Retail Media Landscape
As we reported earlier this month, retail media spending is approaching $100 billion. Walmart Connect, Amazon Ads, and Kroger Precision Marketing have established the playbook. But Costco's approach is notable for what it's not doing: flooding pages with sponsored products. The "digital endcap" framing — limited, premium placements in high-intent locations — mirrors the physical store experience where every square foot of product placement is deliberately curated.
For CPG brands, Costco Velocity could become one of the most valuable retail media channels precisely because it's scarce. In a warehouse with roughly 4,000 SKUs compared to the 30,000+ at a typical grocery store, every product recommendation carries more weight. If Moloco's AI can deliver genuinely relevant suggestions, the conversion potential is significant.
The real question is whether Costco can scale its retail media revenue without diluting the treasure-hunt experience that defines the brand. Every retailer says they'll put the customer experience first. Costco might actually mean it.