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
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
- partners_withSep 10, 2026
Commonwealth Fusion Systems LLC partnered with Hyundai Group on Sep 10th '26.
- receives_financingAug 3, 2026
Commonwealth Fusion Systems LLC received financing of $13.5M in Series A on Jul 1st '18.
- is_developingJul 31, 2026
Commonwealth Fusion Systems LLC is developing net-energy positive fusion device on Jul 31st '26.
- is_developingJul 31, 2026
Commonwealth Fusion Systems LLC is developing SPARC fusion demonstration machine on Jul 31st '26.
- receives_financingJul 31, 2026
Commonwealth Fusion Systems LLC was planning to receive financing of $1B in funding on Jul 31st '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.
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Frequently Asked Questions
Common questions about Commonwealth Fusion Systems's valuation, stock price, and market status.
Is CFS a public or private company?
CFS is a private company.
What is the current stock price of CFS?
CFS is a private company with no public stock price. No recent secondary market data is available.
How much is CFS worth (valuation)?
CFS's valuation is estimated at $5.0B based on funding round data.
Can I buy CFS stock?
CFS shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors. Visit https://www.caplight.com to learn more.
When was CFS's last funding round?
CFS's most recent funding round was Series B Extension on December 1, 2021.
Who are the main investors in CFS?
Key investors in CFS include Temasek, Eni, Breakthrough Energy Ventures, Tiger Global Management.
Will CFS IPO soon?
No public IPO plans have been announced for CFS.
How can I track CFS secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor CFS's secondary market activity and sign up for updates.