Helion raises $465M at $15.5B valuation

Helion raised $465 million in Series G funding led by Thrive Capital, achieving a $15.5 billion valuation. The round nearly triples the company's valuation from its January 2025 raise. Helion, backed by Sam Altman, announced the funding on Thursday. The investment boosts Helion's progress in fusion energy development. The valuation reflects increased confidence in commercial fusion timelines.