It may be time to pump the brakes on this EV maker after a huge jump in its share price.The share price of Rivian Automotive (RIVN +0.07%) skyrocketed after the electric vehicle (EV) maker returned to being gross-margin positive and offered upbeat commentary about the upcoming launch of its R2 SUV next year. The stock is now up nearly 50% over the past year after the surge.Let's take a closer look at the company's results and prospects to see whether or not it's too late to buy the stock.The R2 remains in f ...