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Inside Costco’s Secretive Retail Media Strategy: What Mark Williamson Revealed

Costco has always been the effortlessly cool kid of the retail media world: unbothered by hype, quietly confident, and doing things entirely on its own terms. In this episode, I unpack what makes Costco’s retail media approach so different from the 80+ U.S. retail media networks vying for attention, and why their “member-first, margin-second” philosophy is more than just a tagline.

After digging through Mark Williamson (Retail Media AVP at Costco) interviews, I piece together a clearer picture of how Costco is building a retail media business that deeply aligns with its culture, elevates…

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