Helion Energy
PrivateLast Round
Series G
Jun 4, 2026
Est. Valuation
$15.5B
Total Funding Raised
$1.49B
Momentum
Top 25%
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
Price History
Caplight MarketPrice™ estimate for Helion Energy, published with a 90-day delay.
Caplight MarketPrice™
$66.31
per share, as of May 2026
+152.1%
2-year change
Caplight MarketPrice™ is an estimate of private secondary market pricing, shown here on a delayed basis for illustrative purposes only. It may be incomplete, is subject to change, and may not be relied upon for any purpose or considered investment advice.
Helion Energy Comparables
Compare Helion Energy with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Commonwealth Fusion Systems | 85% | |
| Pacific Fusion | 84% | |
| TAE Technologies | 82% |
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 |
Key People
Founding team and executive leadership
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 |
Market signals
Structured signals derived from secondary market and firmographic data.
- Jan 1, 2028
Aims to deliver fusion energy to the grid by 2028.
- Jun 26, 2026
Grew 16% QoQ, from 484 to 562 employees.
Recent news
Latest coverage and updates
- expands_offices_toSep 8, 2026
Helion Energy expanded offices to Seattle, Washington, United States, Northern America, Americas on Sep 8th '26.
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.
Request accessAppears 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 a public or private company?
Helion is a private company.
What is the current stock price of Helion?
Helion is a private company with no public stock price. Caplight tracks Helion's secondary market activity and provides MarketPrice™ estimates to Caplight users.
How much is Helion worth (valuation)?
Helion's valuation is estimated at $15.5B based on funding round data.
Can I buy Helion stock?
Helion shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors. Visit https://www.caplight.com to learn more.
When was Helion's last funding round?
Helion's most recent funding round was Series G on June 4, 2026.
Who are the main investors in Helion?
Key investors in Helion include Capricorn Investment Group, Thrive Capital, Lightspeed Venture Partners.
Will Helion IPO soon?
No public IPO plans have been announced for Helion.
How can I track Helion secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor Helion's secondary market activity and sign up for updates.