DoorDash shares plunged Thursday after the food delivery firm missed profit estimates and gave a weak outlook. Yuki Iwamura / Bloomberg / Getty Images Close Key Takeaways Major U.S. equities indexes slid Thursday afternoon, led by tech stocks after a flurry of earnings reports and as worries about an AI bubble resurfaced. The Dow, S&P 500, and Nasdaq all lost ground. DoorDash (DASH) was the worst-performing stock in the S&P 500 after the food delivery firm's earnings fell short of forecasts and it gave a we ...