Tesla reported deliveries for the third quarter that beat estimates. Sales may have benefited from customers rushing to buy EVs before the expiration of a key tax credit. Some caution that momentum could fade now that the tax credit is no longer available. The move: Tesla stock jumped as much as 2% on Thursday, before reversing gains to trade lower by about 0.5%. Why: Tesla reported 497,099 vehicle deliveries in the third quarter, a 7% increase over the same period last year.