Helion Energy
PrivateLast Round
Series G
Jun 4, 2026
Est. Valuation
$15.5B
Total Funding Raised
$1.49B
Momentum
Top 10%
of companies Caplight tracks
Company Overview
Helion Energy is a clean energy company that develops patented plasma accelerator technology to produce low-cost, zero-carbon electricity through magneto-inertial fusion generators.
Sector
Energy & Sustainability
Verticals
Renewable Energy, Energy Management
Business Model
B2B
Customer Profile
Services & Consulting
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Helion Energy Comparables
Compare Helion Energy with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Commonwealth Fusion Systems | 85% | |
| TAE Technologies | 83% | |
| Zap Energy | 82% |
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Helion Energy Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series G | Jun 4, 2026 | ||||
| Series F | Jan 28, 2025 | ||||
| Strategic | Sep 27, 2023 | ||||
| Series E | Nov 5, 2021 | ||||
| Series D | Sep 22, 2020 | ||||
Series C | Jan 1, 2019 |
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Key People
Founding team and executive leadership
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Helion Energy Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| SoftBank Investment Advisers | Series G, Series F |
| Capricorn Investment Group | Series B, Series F, Series D, Series E, Series G, Series C |
| Peak XV Partners | Series G |
| Thrive Capital | Series G |
| SoftBank Group | Series F |
| Lux Capital | Series G |
| Alta Park Capital | Series G |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Jun 26, 2026
Grew 16% QoQ, from 484 to 562 employees.
- Jun 4, 2026
$465M round led by Thrive Capital.
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Recent news
Latest coverage and updates
- is_developingOct 28, 2026
Helion Energy plans to develop high-voltage semiconductors under a letter of intent with the U.S. Department of Commerce for up to $175 million in CHIPS research and development funding, announced in Washington on Oct 22nd '26.
- expands_facilitiesOct 22, 2026
Under a proposed plan, Helion Energy would spend more than $100 million in Washington on semiconductor research, advanced packaging, and manufacturing lines, with more than 100 jobs.
- is_developingOct 22, 2026
Helion Energy plans to develop high-voltage power semiconductors and advanced energy power modules in fusion power generation with up to $175 million in funding in Washington on Oct 22nd '26.
- receives_financingOct 22, 2026
Helion Energy receives $225M through an award combined with additional private investment to develop and manufacture advanced semiconductors in the United States.
- receives_financingOct 22, 2026
Helion Energy signs a letter of intent with the U.S. Department of Commerce to receive up to $175M through the CHIPS Research and Development Office for developing and manufacturing high-voltage power semiconductors and advanced energy power modules for fusion power generation.
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Helion Energy Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Appears On
Curated lists and screens where this company is featured.
Frequently Asked Questions
Common questions about Helion Energy's valuation, stock price, and market status.
Is Helion Energy a public or private company?
Helion Energy is a private company.
What is the current stock price of Helion Energy?
Helion Energy is a private company, so its shares have no public market price. Caplight tracks Helion Energy's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Helion Energy worth (valuation)?
Helion Energy's valuation is estimated at $15.5B based on funding round data.
Can I buy Helion Energy stock?
Helion Energy shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Helion Energy's last funding round?
Helion Energy's most recent funding round was Series G on June 4, 2026.
Who are the main investors in Helion Energy?
Key investors in Helion Energy include Capricorn Investment Group, Thrive Capital, Lightspeed Venture Partners.
Will Helion Energy IPO soon?
No public IPO plans have been announced for Helion Energy.
How can I track Helion Energy secondary market activity?
Caplight tracks bids, offers, and trades in Helion Energy's shares on secondary markets.