Helion
formerly Helion EnergyBuilding the world's first fusion power plant
Helion was founded in 2013, is headquartered in Everett, United States, lists 201–500 employees, and has $1.5B in recorded funding across 6 rounds.
- Headquarters
- Everett, Washington
- Employees
- 201–500
- Founded
- 2013
- Business Model
- B2B
- Website
- helionenergy.com
- Total Funding
- $1.5B
- Last Round
- $465.0M Series G+Jun 2026
- Rounds
- 6
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 6 funding rounds and 7 investors for this company. The full record is or through the API.
About
Helion was founded in Washington State by Dr. David Kirtley, Chris Pihl, Dr. John Slough, and Dr. George Votroubek with the goal to build a fusion system designed for commercial electricity. Helion signs customer agreements with the industry's first two customers: Microsoft and Nucor. Raised $500M to build 7th fusion prototype, Polaris.
Summary
Helion is a Clean Energy company based in Everett, United States, founded in 2013. It lists 201–500 employees. It has raised $1.5B in total across 6 rounds, most recently a $465.0M Series G+ round in Jun 2026. Investors include Thrive Capital, Nucor and Sam Altman.
Tech & App Stack
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Funding History
Jun 2026
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Funding: Series C through Series G+. Amounts, valuations, and investors where available.
Investors
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