Costco (COST) has expanded Costco delivery via Uber Eats (UBER) to 47 states

Partnership expansions between a big-box retailer and a delivery platform sit at the low end of the materiality scale for both names, and past episodes of this kind have tended to be treated as incremental top-line colour rather than thesis-changing events. The distinction worth drawing is between a pilot and a near-nationwide rollout: once coverage approaches most of the addressable footprint, the incremental read-through shifts from logistics validation to whether same-day and third-party channels actually show up in comparable sales or membership metrics, which is where Costco's delivery economics have historically been scrutinised given its thin-margin model. For the platform side, grocery and retail order volume has been the growth leg of the delivery segment, and announcements of this type have previously served as confirmation of that mix shift rather than new information. What matters next is disclosure: whether either party quantifies order volumes, basket sizes, or the fee structure on subsequent earnings calls, and whether the partnership extends to additional formats or markets. Absent such detail, the market reaction to comparable announcements has typically been modest and short-lived in both names.