Key TakeawaysVistra shares are higher after the its third-quarter results comfortably topped expectations. The electricity provider has been the best-performing stock in the S&P 500 this year. Vistra has seen enthusiasm about using nuclear capacity to power energy-intensive AI processes. Vistra Corp (VST) shares climbed after the company posted third-quarter earnings that smashed expectations after the market closed Wednesday.  The Texas-based electricity provider reported revenue of $6.29 billion, up 54% ...