Helion
Helion Energy, Inc. is an American fusion research and technology company based in Everett, Washington. Founded in 2013, Helion is dedicated to developing commercial fusion power plants that aim to provide clean, low-cost, and sustainable electricity. The company is led by CEO David Kirtley, CTO Chris Pihl, and Principal Scientist George Votroubek, and has received recognition for its innovative approach to clean energy. Helion is focused on magneto-inertial fusion technology, which combines magnetic and inertial fusion principles. Their reactors use deuterium and helium-3 as fuel, targeting aneutronic fusion to minimize radioactive waste. This technology is designed to be smaller, cheaper, and faster to develop than traditional fusion reactors, with the potential to produce electricity at around $0.01 per kWh. Helion's business model includes developing fusion generators, selling electricity through purchase power agreements, and partnering with large energy consumers like Microsoft and Nucor Corporation. The company aims to have its first commercial fusion power plant operational by 2028.
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Headcount trend
Helion went from 265 employees in Oct 2024 to 498 in Sep 2026. Apr to Sep 2026: 89 people joined, 20 left.
Org structure
Headcount by department
Funding
- Jan 2025 · Series F · $425M · Lightspeed Venture Partners, SoftBank Vision Fund 2, Mithril Capital
- Oct 2023 · $35M · Nucor
- Nov 2021 · Series E · $500M · Mithril Capital, Capricorn Investment Group
- Sep 2021 · Series D · $40M
- Jan 2019 · Series C · $10M
- Jul 2015 · Series A · $10.6M
- Aug 2014 · Seed · $1.5M · Mithril Capital, Y Combinator
Salaries at Helion
All salaries2 salary profiles in India
H-1B sponsorship
Peer reviews
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Hiring now
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Helion FAQ
How many employees does Helion have?
Helion has about 498 employees, up 5.7% over the 3 months to Sep 2026.
Does Helion sponsor H1B visas?
Yes. Helion filed 3 H1B (LCA) applications in FY2026, according to the latest U.S. Department of Labor disclosures. Most of them were for Engineering roles.
What is Helion's revenue per employee?
Helion makes about $50K in revenue per employee, based on $25M annual revenue and 498 employees.
How much does Helion pay?
6figr has 2 salary profiles for Helion in India and 1 in the US, with pay broken down by role, level and gender on the Helion salaries page. See Helion salaries in India
How much funding has Helion raised?
Helion has raised $1.02B in total funding; its latest round was Series F in Jan 2025.
Data from Company Prospectus, DOL LCA disclosures, WARN notices and 6figr salary profiles.