---
title: "Instacart Stock (CART) Sinks on DoorDash-Costco Partnership Rumors — Here's Why Investors Are Worried"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/299084933.md"
description: "Instacart (CART) shares dropped 5% to approximately $47 following rumors that DoorDash may partner with Costco, a key Instacart client. Market intelligence firm Edgewater Research reported these checks suggest DoorDash is expanding its marketing push, which could exert short-term pressure on Instacart's business."
datetime: "2026-09-15T18:18:45.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/299084933.md)
  - [en](https://longbridge.com/en/news/299084933.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/299084933.md)
generator: "portal-rs"
---

# Instacart Stock (CART) Sinks on DoorDash-Costco Partnership Rumors — Here's Why Investors Are Worried

Shares in Maplebear's (CART) Instacart grocery delivery business fell by 5% to around $47 on Tuesday afternoon. This followed a report from market intelligence firm Edgewater Research that online food delivery giant DoorDash (DASH) may be moving to establish a partnership with wholesale retailer Costco (COST). Costco is a key partner for Instacart, which may explain why CART stock is dropping.

Edgewater said its report is based on checks with industry players. The checks suggest that DoorDash is expanding its marketing push. The firm expects a DoorDash-Costco partnership to cause short-term pressure for Instacart's business.

### Related Stocks

- [CART.US](https://longbridge.com/en/quote/CART.US.md)
- [DASH.US](https://longbridge.com/en/quote/DASH.US.md)
- [COST.US](https://longbridge.com/en/quote/COST.US.md)
- [COTG.US](https://longbridge.com/en/quote/COTG.US.md)
- [DASX.US](https://longbridge.com/en/quote/DASX.US.md)
- [COSW.US](https://longbridge.com/en/quote/COSW.US.md)

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- [Costco puts a price on the oil crunch](https://longbridge.com/en/news/299202450.md)
- [Why Costco (COST) Looks Like a Buy before Q4 Earnings](https://longbridge.com/en/news/299181558.md)
- [Costco Stock (COST) in Focus as Company Limits Motor Oil Purchases](https://longbridge.com/en/news/298953540.md)
- [Costco Wholesale Corporation $COST Shares Sold by Amundi](https://longbridge.com/en/news/298878303.md)
- [Concurrent Investment Advisors LLC Increases Holdings in Costco Wholesale Corporation $COST](https://longbridge.com/en/news/298798721.md)

---
> **Disclaimer: This article is for reference only and does not constitute any investment advice.**