Helion

$465.0M Series G

Announced: Jun 4, 2026
Sector: Energy
Investors: 7

Summary

Everett-based Helion raised $465 million in a Series G round to help build a power plant for Microsoft. Investors included Sam Altman, SoftBank Vision Fund 2, Reid Hoffman, KKR, BlackRock, Mithril Capital Management, and Capricorn Investment Group.

Investors

Sam Altman, SoftBank Vision Fund 2, Reid Hoffman, KKR, BlackRock, Peter Thiel’s Mithril Capital Management, Capricorn Investment Group