Helical Fusion Co., Ltd.
PrivateLast Round
Series B
Apr 27, 2026
Total Funding Raised
$41.88M
Momentum
Top 5%
of companies Caplight tracks
Company Overview
Helical Fusion Co., Ltd. operates in Energy & Sustainability and is based in Tokyo. Its latest recorded funding round was a Series A Extension round in December 2025.
Helical Fusion Co., Ltd. is a clean technology company that develops commercial fusion reactors based on the helical-stellarator design to provide a sustainable and stable energy source.
Sector
Energy & Sustainability
Verticals
Renewable Energy, Advanced Materials
Business Model
B2B
Customer Profile
Services & Consulting, Government Contracts, Revenue Share
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Helical Fusion Co., Ltd. Comparables
Compare Helical Fusion Co., Ltd. with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Type One Energy Group | 83% | |
| Stellarex Energy | 83% | |
| Proxima Fusion | 81% |
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Helical Fusion Co., Ltd. Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series B | Apr 27, 2026 | ||||
| Series A Extension | Dec 4, 2025 | ||||
| Debt | Jul 11, 2025 | ||||
| Series A | Jul 10, 2025 | ||||
| Grant | Oct 13, 2023 | ||||
Seed | Apr 5, 2023 |
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Key People
Founding team and executive leadership
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Helical Fusion Co., Ltd. Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Tokai Tokyo Investment Co., Ltd. | Series A |
| Sony Ventures Corporation | Pre Seed |
| Biotope by VIB | Pre Seed |
| Keio Innovation Initiative | Series A |
| Mizuho Capital | Series A |
| 株式会社日本政策金融公庫 | Debt, Series A |
| Nissay Capital | Series A |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Oct 1, 2026
Open roles increased to 23, 115% of headcount.
- Sep 21, 2026
Open roles increased from 0 to 17, representing 85% of headcount.
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Recent news
Latest coverage and updates
- attends_eventOct 30, 2026
Helical Fusion Co.'s Co-Founder & CEO, Takaya Taguchi, is set to speak at Web Summit 2026 in Lisbon, Portugal, from Nov 9th to 12th '26, in a session on next-generation energy technologies.
- partners_withOct 29, 2026
Helical Fusion Co. partners with Gauss Fusion GmbH through a Joint Statement of Intent to advance the commercialization of Helical Stellarator and Modular Stellarator technologies.
- is_developingOct 11, 2026
Helical Fusion Co. is developing a helical, or stellarator-type, fusion reactor and is manufacturing and constructing equipment for a superconducting-magnet demonstration associated with its planned Helix HARUKA device.
- partners_withOct 8, 2026
Helical Fusion Co. and Fuji Electric Co. work together under a 2025 agreement for Fuji Electric Co. to supply power supply equipment for Helical Fusion Co.'s HTS magnet development and broaden collaboration toward future fusion power systems.
- receives_financingOct 8, 2026
Helical Fusion Co. receives $79M in cumulative financing, including grants and loans, as Fuji Electric and other investors support the Helix Program in the second close.
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Helical Fusion Co., Ltd. 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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Frequently Asked Questions
Common questions about Helical Fusion Co., Ltd.'s valuation, stock price, and market status.
Is Helical Fusion Co., Ltd. a public or private company?
Helical Fusion Co., Ltd. is a private company.
What is the current stock price of Helical Fusion Co., Ltd.?
Helical Fusion Co., Ltd. is a private company, so its shares have no public market price. Caplight tracks Helical Fusion Co., Ltd.'s secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Helical Fusion Co., Ltd. worth (valuation)?
Valuation information for Helical Fusion Co., Ltd. is not publicly available.
Can I buy Helical Fusion Co., Ltd. stock?
Helical Fusion Co., Ltd. shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Helical Fusion Co., Ltd.'s last funding round?
Helical Fusion Co., Ltd.'s most recent funding round was Series B on April 27, 2026.
Who are the main investors in Helical Fusion Co., Ltd.?
Key investors in Helical Fusion Co., Ltd. include Keio Innovation Initiative, SBI Investment Co., Ltd..
Will Helical Fusion Co., Ltd. IPO soon?
No public IPO plans have been announced for Helical Fusion Co., Ltd..
How can I track Helical Fusion Co., Ltd. secondary market activity?
Caplight tracks bids, offers, and trades in Helical Fusion Co., Ltd.'s shares on secondary markets.