Constellation Energy Corporation has become one of the standout stories in the utility and clean‑energy sector in 2025. As of the close on December 5, 2025, Constellation Energy stock traded at $359.82, giving the company a market capitalization of roughly $110–115 billion and placing it among the world’s largest utilities by value.Companies Market Cap+1 Over the past three years, the stock has delivered a staggering 311% total return, with gains of more than 40% over the last 12 months and close to 50–60% year to date, according to recent valuation work from Simply Wall St.Simply Wall St That kind of performance has pushed CEG firmly onto the radar of both institutional investors and retail traders looking for exposure to nuclear and AI‑driven power demand.