Commonwealth Fusion Systems
PrivateLast Round
VC Round
Jul 30, 2026
Est. Valuation
$5B
Total Funding Raised
$2.91B
Momentum
Top 5%
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, Clean Manufacturing
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 |
| MIT | Series A Extension, Seed, Series A |
| 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 |
Market signals
Structured signals derived from secondary market and firmographic data.
- Jul 30, 2026
$1.0B round raised
- Jul 27, 2026
Monthly visitors increased 41% MoM.
Recent news
Latest coverage and updates
- is_developingOct 8, 2026
On Oct 8th '26 in Massachusetts, Commonwealth Fusion Systems LLC plans to develop the AI-enabled digital twin platform with 10 National Laboratories, universities, and industry partners to optimize SPARC’s performance and accelerate commercial fusion energy.
- expands_facilitiesOct 5, 2026
Commonwealth Fusion Systems LLC expands its facilities with a magnet factory in Massachusetts
- expands_facilitiesSep 30, 2026
Commonwealth Fusion Systems LLC develops its first grid-scale ARC power plant facility in Virginia on Sep 30th '26
- attends_eventSep 28, 2026
Commonwealth Fusion Systems LLC attended event TechCrunch Disrupt 2026 on Sep 28th '26.
- partners_withSep 10, 2026
Commonwealth Fusion Systems LLC partnered with Hyundai Group on Sep 10th '26.
Commonwealth Fusion Systems 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.
Request accessAppears 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.
Is Commonwealth Fusion Systems a public or private company?
Commonwealth Fusion Systems is a private company.
What is the current stock price of Commonwealth Fusion Systems?
Commonwealth Fusion Systems is a private company, so its shares have no public market price. Caplight tracks Commonwealth Fusion Systems's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Commonwealth Fusion Systems worth (valuation)?
Commonwealth Fusion Systems's valuation is estimated at $5.0B based on funding round data.
Can I buy Commonwealth Fusion Systems stock?
Commonwealth Fusion Systems shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Commonwealth Fusion Systems's last funding round?
Commonwealth Fusion Systems's most recent funding round was VC Round on July 30, 2026.
Who are the main investors in Commonwealth Fusion Systems?
Key investors in Commonwealth Fusion Systems include Temasek, Eni, Breakthrough Energy Ventures, Tiger Global Management.
Will Commonwealth Fusion Systems IPO soon?
No public IPO plans have been announced for Commonwealth Fusion Systems.
How can I track Commonwealth Fusion Systems secondary market activity?
Caplight tracks bids, offers, and trades in Commonwealth Fusion Systems's shares on secondary markets.