Helical Fusion Co., Ltd.
PrivateLast Round
Series A
Extension
Dec 4, 2025
Total Funding Raised
$41.88M
Company Overview
Helical Fusion Co., Ltd. is a Japanese startup developing a commercial fusion reactor to provide a sustainable and stable energy source. As a spin-off from the National Institute for Fusion Science (NIFS), the company leverages decades of research to build a reactor based on the helical-stellarator design, a magnetic confinement method known for enabling stable, continuous plasma operation. The company's objective is to construct the world's first steady-state, net-power fusion plant, with a pilot plant named "Helix KANATA" planned for the 2030s. Helical Fusion is actively developing core technologies, such as high-temperature superconducting (HTS) magnets, and collaborates with various industrial partners. The company has secured significant funding, including a Series A round in July 2025, to advance its "Helix Program" and accelerate development.
Sector
Frontier & Industrial Tech
Verticals
Renewable Energy, Computing Hardware, Advanced Materials
Business Model
B2G
Customer Profile
Government Contracts, Services & Consulting
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Helical Fusion Co., Ltd. Comps
Public and private peers based on sector, stage, and business model.
Helical Fusion Co., Ltd. Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series A Extension | Dec 4, 2025 | ||||
| Debt | Jul 11, 2025 | ||||
| Series A | Jul 11, 2025 | ||||
| Grant | Oct 17, 2023 | ||||
| Seed | Apr 5, 2023 | ||||
Pre Seed | May 10, 2022 |
Key People
Founding team and executive leadership
Helical Fusion Co., Ltd. Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Tokai Tokyo Investment Co., Ltd. | Series A |
| 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 | Series A, Debt |
| Nissay Capital | Series A |
| KDDI Green Partners Fund | Series A |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 27, 2026
Developing integrated demonstration device 'Helix HARUKA' in Japan.
- Apr 6, 2026
Selected for Tokyo Metropolitan Government's Zero Emission program.
Helical Fusion Co., Ltd. Filings
SEC and related filings with document metadata.
| Typed | Date | Amount Offered | Amount Sold | Filling | Pages | Download |
|---|---|---|---|---|---|---|
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Frequently Asked Questions
Common questions about Helical Fusion Co., Ltd.'s valuation, stock price, and market status.
