Commonwealth Fusion Systems
PrivateLast Round
VC Round
Jul 30, 2026
Est. Valuation
$5B
Total Funding Raised
$2.91B
Momentum
Top 25%
of companies Caplight tracks
Company Overview
Commonwealth Fusion Systems is an energy technology company that designs and constructs fusion machines to deliver clean, limitless fusion energy.
Sector
Energy & Sustainability
Verticals
Renewable Energy, Advanced Materials
Business Model
B2B
Customer Profile
Revenue Share, Services & Consulting, Hardware Sales
AI Layer
Application
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Commonwealth Fusion Systems Comparables
Compare Commonwealth Fusion Systems with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| TAE Technologies | 85% | |
| Helion | 83% | |
| Tokamak Energy | 81% | |
Commonwealth Fusion Systems Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| VC Round | Jul 30, 2026 | ||||
| Series B Extension | Aug 28, 2025 | ||||
| Series B | Dec 1, 2021 | ||||
| Series A Extension | May 26, 2020 | ||||
| Series A | Jun 27, 2019 | ||||
Seed | Mar 9, 2018 |
Key People
Founding team and executive leadership
Commonwealth Fusion Systems Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| One Madison Group | Series B |
| Development Bank of Japan | Series B, Series B Extension |
| Fine Structure Ventures | Series A Extension, Series B |
| Fujikura Ltd. | Series B, Series B Extension |
| Temasek | Series B, Series A Extension |
| Future Ventures | Series A Extension, Series B, Series A, Series B Extension |
| Galaxy Interactive | Series B, Series B Extension |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 21, 2026
Experts gathered for the second Boundary Collaborators Workshop.
- Mar 4, 2026
SPARC tokamak assembly underway, targeting 140MW fusion power.
Commonwealth Fusion Systems Filings
SEC and related filings with document metadata.
| Typed | Date | Amount Offered | Amount Sold | Filling | Pages | Download |
|---|---|---|---|---|---|---|
Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation |
Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation |
Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation |
Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation | Sign Up to view | Mock Valuation |
Appears On
Curated lists and screens where this company is featured.
Frequently Asked Questions
Common questions about Commonwealth Fusion Systems's valuation, stock price, and market status.