DoorDash sees strong quarterly growth in sales and orders but warns of big costs

DoorDash said Wednesday its revenue rose 38% in the fourth quarter as it gained new U.S. customers and added new services like restaurant reservations. Investors cheered that growth, sending DoorDash's stock up more than 13% in after-hours trading. But the San Francisco-based delivery company also warned of costly investments ahead. DoorDash CEO and Co-founder Tony [...]