Helion raises $500M Series E led by Sam Altman, with up to $1.7B more tied to milestones

Helion

Helion closed a $500M Series E led by Sam Altman, with up to $1.7B more available if the company achieves performance milestones. The capital will complete Polaris, Helion's seventh-generation fusion machine meant to demonstrate net electricity generation from fusion.

• $500M Series E led by Sam Altman (executive chairman since 2015); additional $1.7B available through milestone-based funding
• Additional investors include Dustin Moskovitz, Mithril Capital, Capricorn Investment Group
• Funding to complete Polaris with 2024 target for demonstrating net fusion electricity; supports goal to be first to generate fusion power