Kyoto Fusioneering
PrivateLast Round
Series D
Aug 24, 2026
Est. Valuation
$542.5M
Total Funding Raised
$164.75M
Momentum
Top 5%
of companies Caplight tracks
Company Overview
Kyoto Fusioneering operates in Energy & Sustainability and is based in Tokyo. Its latest recorded funding round was a Debt round in September 2025.
Kyoto Fusioneering is an alternative energy equipment company that develops advanced technologies, including gyrotron systems, tritium fuel cycle solutions, and breeding blankets, for commercial fusion power plants.
Sector
Energy & Sustainability
Verticals
Renewable Energy, Clean Manufacturing
Business Model
B2B
Customer Profile
Hardware Sales, Services & Consulting, Government Contracts
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Kyoto Fusioneering Comparables
Compare Kyoto Fusioneering with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Canon Inc. | 73% | |
| Cocchi Technologies | 70% | |
| Thales Group | 69% |
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Kyoto Fusioneering Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series D | Aug 24, 2026 | ||||
| Debt | Sep 9, 2025 | ||||
| Series C Extension | Sep 9, 2025 | ||||
| Series C Extension | Jul 23, 2024 | ||||
| Series C Extension | Apr 11, 2024 | ||||
Series C | May 17, 2023 |
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Kyoto Fusioneering Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| JAFCO Group Co., Ltd. | Series C Extension, Series B, Series C |
| Development Bank of Japan | Series D, Series B, Series C |
| Coral Capital | Series C Extension, Seed, Series B, Series C |
| Fujikura Ltd. | Series C Extension |
| Mitsubishi UFJ Financial Group | Debt |
| K4 Ventures | Series C Extension, Series C |
| 京都キャピタルパートナーズ | Series C Extension |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Aug 24, 2026
$105M round with participation from DBJ Capital and MUFG Bank.
- Jan 1, 2026
Secured National Institute for Fusion Science as a customer.
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Recent news
Latest coverage and updates
- partners_withNov 3, 2026
Kyoto Fusioneering Ltd. and Focused Energy sign an MoU on Nov 3rd '26 to strengthen cooperation between the Japanese and German fusion industries and explore technical cooperation, research-hub collaboration, and joint market development.
- partners_withOct 28, 2026
Kyoto Fusioneering Ltd. and Proxima Fusion GmbH partner under a memorandum of understanding to expand joint work on next-generation gyrotrons and fuel-cycle technologies for commercial fusion power plants, with Proxima Fusion GmbH contributing technologies and engineering expertise to deployment in Germany, on Oct 28th '26 in Japan.
- is_developingOct 28, 2026
Kyoto Fusioneering Ltd. and Proxima Fusion sign an MoU in Japan on Oct 28th '26 to continue and expand joint work on next-generation gyrotrons for plasma heating and fuel-cycle technologies for commercial fusion power.
- partners_withOct 7, 2026
On Oct 7th '26, Kyoto Fusioneering Ltd. partners with Daido Steel Co. in a joint development program to establish commercial manufacturing technology for low-activation vanadium alloy, after melting and forging 200 kg of high-purity vanadium and advancing toward a fusion-blanket mock-up.
- is_developingSep 29, 2026
Kyoto Fusioneering Ltd. has been working on high-power, continuous-operation gyrotrons and power supplies for superhot geothermal applications under Japan’s NEDO Deep-Tech Startups Support Program since 2024.
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Kyoto Fusioneering Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
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Frequently Asked Questions
Common questions about Kyoto Fusioneering's valuation, stock price, and market status.
Is Kyoto Fusioneering a public or private company?
Kyoto Fusioneering is a private company.
What is the current stock price of Kyoto Fusioneering?
Kyoto Fusioneering is a private company, so its shares have no public market price. Caplight tracks Kyoto Fusioneering's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Kyoto Fusioneering worth (valuation)?
Kyoto Fusioneering's valuation is estimated at $542.5M based on funding round data.
Can I buy Kyoto Fusioneering stock?
Kyoto Fusioneering shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Kyoto Fusioneering's last funding round?
Kyoto Fusioneering's most recent funding round was Series D on August 24, 2026.
Who are the main investors in Kyoto Fusioneering?
Key investors in Kyoto Fusioneering include Japan Investment Corporation, Global Brain Corporation, JIC Venture Growth Investments, JIC Investment, In-Q-Tel.
Will Kyoto Fusioneering IPO soon?
No public IPO plans have been announced for Kyoto Fusioneering.
How can I track Kyoto Fusioneering secondary market activity?
Caplight tracks bids, offers, and trades in Kyoto Fusioneering's shares on secondary markets.