DoorDash reports Q4 revenue up 38% YoY to $3.96B, vs. $3.99B est., total orders up 32% to 903M, and forecasts Q1 adjusted EBITDA below estimates (Samantha Subin/CNBC)

Samantha Subin / CNBC: DoorDash reports Q4 revenue up 38% YoY to $3.96B, vs. $3.99B est., total orders up 32% to 903M, and forecasts Q1 adjusted EBITDA below estimates   —  Doordash's stock dropped 10% after the food delivery platform issued disappointing fourth-quarter results and guidance as it ramps up its investments in new technology.