Serve Robotics Sinks 7% as Guidance Cut Overshadows Grubhub Deal; Symbotic Drops 5%, DoorDash Ticks Up

Serve Robotics (NASDAQ:SERV) sank 7% to $4.55 Tuesday afternoon, wiping out Monday’s Grubhub-fueled rally after the company cut its 2026 revenue guidance following its Aug. 6 earnings report. Full-year 2026 revenue guidance was lowered to $9 million to $10 million from about $26 million, and the stock is down 56% year to date. The reset was driven by softer Uber Eats delivery volumes, even as a Grubhub partnership and expanded DoorDash coverage briefly boosted sentiment Monday. Serve said its Q2 2026 revenue was $3.2 million, up 404% year over year, but attributed the outlook decline to “changes in the operating model and integration of our fleet.”