Live from the Vusion podcast studio at Groceryshop 2026 in Las Vegas, Chris Walton catches up with Mark Williamson, AVP of Retail Media at Costco, to discuss the evolution of Costco’s retail media capabilities and how the business is balancing advertising with its core membership experience.

Mark looks at Costco’s rebuilt ad server, clean room, offsite measurement and search integrations, while explaining how retail media connects to a business where much of the shopping still happens inside the warehouse. The conversation also turns to the next phase of digital discovery as AI agents increasingly enter the shopping journey.

In this episode:

• The progress of Costco’s retail media technology stack

• Building retail media around the Costco membership experience

• How Costco connects ad exposure to in-warehouse sales

• The role of membership in Costco’s retail media strategy

• Why the warehouse remains central to Costco’s advertising proposition

• How AI agents could change search, discovery and advertising

• What it means to reach a shopper when the shopper is an AI agent

🎧 Subscribe to Omni Talk Retail for more conversations with the leaders shaping retail.