Costco Partnership Adds Grocery Density, Not Yet Profit Proof

What happened

Costco products are now available on DoorDash's marketplace across the United States, adding another high-profile grocery partner to the platform. DoorDash already claimed it became the leading third-party U.S. grocery and retail marketplace by order volume in 2025, with DashPass members placing about 75% of U.S. grocery and retail orders in Q2 2026. This partnership likely strengthens selection and could support order growth, but it does not directly address the core investment question around profit density: Q2 2026 net revenue margin was flat at 13.5% and GAAP net income fell 30% year over year. The press release from PYMNTS is a channel announcement, not a filing, and lacks financial terms, so its impact on economics is uncertain. Overall, this is consistent with DoorDash's strategy of expanding grocery and retail, but it does not alter the fact that the stock trades at 103x P/E and 51x EV/EBITDA, requiring proof of higher monetization.

Implication

This adds to DoorDash's grocery moat but doesn't solve margin concerns, as the company still needs to demonstrate that higher fees, ads, and grocery mix lift net revenue margin above the current 13.5%. The partnership may bring incremental orders but could also raise delivery complexity and costs given Costco's bulk item sizes, potentially pressuring contribution margin unless negotiated favorably. Investors should watch for any financial disclosure on revenue contribution or margin impact in upcoming quarters, though such details are unlikely to be broken out. The master report's WAIT rating remains appropriate; attractive entry remains below $175, and the next 90-day checkpoints on fee changes, membership momentum, and ad monetization are more important than this news. Any sustained improvement in profit density, not just order growth, would be required to justify a higher rating.

Thesis delta

The thesis is unchanged: DoorDash's scale and membership density are strong, but valuation already prices in continued growth. The Costco partnership modestly strengthens the grocery expansion narrative but does not address the flat net revenue margin or weak GAAP conversion flagged in Q2 2026. We remain on the sidelines at current prices, looking for evidence of profit density improvement.