Tesla has been stealing the headlines following the launch of its new robotaxi service in Austin, Texas. Rivian (RIVN 1.25%), meanwhile, hasn't received a lot of press recently, but when you look under the hood, there are several major reasons to get excited. There's one catalyst that few investors are paying attention to right now that could add huge fuel to the stock price in early 2026. That makes now the time to buy for investors looking to stay ahead of the curve. Rivian sales should grow tremendously ...