Helion Energy
HE
Helion Energy develops pulsed fusion generators based on field-reversed configuration plasmas. The system is designed to capture fusion energy as electricity through direct energy conversion rather than steam turbines. The company targets utility-scale power generation with low carbon emissions.
Founded by David Kirtley (Co-founder & CEO), Chris Pihl (Co-founder & CTO), George Votroubek (Co-founder & Chief Scientist), John Slough (Co-founder), Anthony Pancotti (Co-founder)
Blended valuation$13.5B$13B secondary
Valuation history
Weekly blended valuation with priced funding rounds marked on the timeline.
$17B
blended valuationfunding round
May 31, 2021$81.6MOct 5, 2026
All rounds
10 funding rounds, newest first.
| Round | Announced | Raised | Post-money |
|---|---|---|---|
| Series G | Jun 4, 2026 | $465M | $15.5B |
| Series F | Jan 28, 2025 | $425M | $5.4B |
| Growth | Sep 27, 2023 | $35M | $4.2B |
| Series E | Nov 5, 2021 | $500M | $3B |
| Series D | Sep 23, 2020 | $40M | $1.3B |
Join Legion to view all 10 rounds.Sign in to Legion
Investors
19 investors across all rounds.
- CICapricorn Investment Group
- MCMithril Capital Management
- SASam Altman
- YCY Combinator
- LVLightspeed Venture Partners
- TCThrive Capital
- BOBoxGroup
- LCLux Capital
- PXPeak XV Partners
- SVSoftBank Vision Fund
Only Legion members can view the full investor roster. Sign in to Legion
Secondary market activity
Recent buy and sell interest for Helion Energy shares on the secondary market.
| Kind | Implied valuation | Price / share | Date |
|---|---|---|---|
| $17.9B | — | Sep 29, 2026 | |
| $6.4B | $74.16 | Sep 23, 2026 | |
| $6.4B | $74.16 | Sep 22, 2026 |
Invest in the private markets on Legion
Registered users see full trading activity, every investor, rankings, and live deals.
Data as of Oct 15, 2026. Valuations are estimates blended from primary and secondary-market signals — not investment advice.