Startup · Japan
Kyoto Fusioneering
HQ Tokyo, JapanFounded 201951-200 employeesUpdated
Builds fusion plant systems, including plasma heating, fuel cycles, blankets, and thermal systems.
Funding9 rounds · ~$211M
- Equity raised
- ~$211M
- Debt, secondaries & grants
- ~$1.38B
- Latest
- ~$1.34BDebt · Aug 24, 2026
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| Aug 24, 2026 | Debt | ~$1.34B | — | — | — | Reported |
| Aug 24, 2026 | Series D | $105M | — | — | — | Confirmed |
| Sep 9, 2025 | Debt | ~$35.8M | — | — | — | Reported |
| Sep 9, 2025 | Series C | ~$9.8M | — | — | — | Reported |
| Jul 23, 2024 | Series C | ~$6.8M | — | — | — | Reported |
| May 16, 2023 | Series C | ~$76.6M | — | — | — | Reported |
| Feb 2, 2022 | Debt | ~$6.1M | — | — | — | Reported |
| Feb 2, 2022 | Series B | ~$11.5M | — | — | — | Reported |
| Jan 15, 2021 | Undisclosed | ~$1.2M | — | — | — | Reported |
- Debt~$1.34BAug 24, 2026
- Series DConfirmed$105MAug 24, 2026
- Debt~$35.8MSep 9, 2025
- Series C~$9.8MSep 9, 2025
- Series C~$6.8MJul 23, 2024
- Series C~$76.6MMay 16, 2023
- Debt~$6.1MFeb 2, 2022
- Series B~$11.5MFeb 2, 2022
- Undisclosed~$1.2MJan 15, 2021
Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.
Capabilities1
| Technology | Role | Maturity | TRL | Notes | Confidence |
|---|---|---|---|---|---|
| Nuclear energy and propulsion | Developer | — | — | classify_sectors run 37, haiku, taxonomy 2026-10-18b: Builds fusion plant systems such as plasma heating, fuel cycles and blankets; no defense use is stated. | Reported |
- Developerclassify_sectors run 37, haiku, taxonomy 2026-10-18b: Builds fusion plant systems such as plasma heating, fuel cycles and blankets; no defense use is stated.—Reported
Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.
People7
| Person | Role |
|---|---|
| Konishi Satoshi | Founder and CEO |
| Richard Pearson | Co-founder |
| Satoshi Konishi | Co-founder |
| Shutaro Takeda | Co-founder |
| Taka Nagao | Co-founder |
| Keishi Sakamoto | Director, Chief Technology Officer |
| Kiyoshi Seko | Chief Operating Officer, Board Director, President |
Sources4
Profile1
- 1
Supports Organization · linkedin url
“https://www.linkedin.com/company/kyoto-fusioneering/”
Funding2
- 2
Supports Funding round, Organization, Organization · ownership
“securing JPY 16.72 billion (approx. USD 105 million) in new equity along with access to JPY 9.0 billion (approx. USD 57 million) in credit and loan facilities, for JPY 25.72 billion (approx. USD 162 million) in total. The funds will accelerate the UNITY™ Program, KF’s staged de-risking program spanning Japan, Canada, and the United States, and expand the company’s supply”
- 3
Octen Business Search · Supports Funding round, Organization · employee range, Role
“funding round: Debt Financing, 2022-02-02, JPY 700,000,000”
People1
- 4
Supports Organization · founded year, Organization · hq city, Organization · hq region, Role
“Establishment October 1, 2019”
Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.