Uber stock tumbled Wednesday after the ride-share and food delivery company reported a surprise first-quarter loss and a weak outlook moving forward — while shares of e-hail rival Lyft went into overdrive after reporting a notable year-over-year acceleration in its latest earnings.Uber was down nearly 6%, to around $65 after the opening bell, as the the company also forecast gross bookings — a key metric that indicates the total dollar value of transaction on the platform — in the second quarter below Wall ...