Fourth State
PrivateLast Round
Grant
Apr 8, 2026
Total Funding Raised
$2.57M
Momentum
Top 25%
of companies Caplight tracks
Company Overview
Fourth State is a clean technology company that develops modular plasma reactor technology for the destruction of PFAS and other persistent contaminants in water.
Sector
Energy & Sustainability
Verticals
Water Treatment, Clean Manufacturing
Business Model
B2B
Customer Profile
Government Contracts, Hardware Sales
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Fourth State Comparables
Compare Fourth State with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| DMAX Plasma, Inc. | 90% | |
| Onvector | 88% | |
| Aclarity | 85% |
Fourth State Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Grant | Apr 8, 2026 | ||||
| Grant | Oct 29, 2025 | ||||
| Accelerator | Jul 14, 2025 | ||||
| Seed | Jan 10, 2022 | ||||
| Grant | Feb 10, 2021 | ||||
Grant | Jan 22, 2020 |
Fourth State Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Cyclotron Road | Accelerator |
| U.S. Department of War | Grant |
| California Energy Commission | Grant |
| Activate | Accelerator |
| Department of Energy | Accelerator, Grant |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 8, 2026
$250K raised from the U.S. Department of War.
- Jul 14, 2025
$300K raised from Activate and Cyclotron Road.
Fourth State 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 accessFrequently Asked Questions
Common questions about Fourth State's valuation, stock price, and market status.
Is Fourth State a public or private company?
Fourth State is a private company.
What is the current stock price of Fourth State?
Fourth State is a private company with no public stock price. No recent secondary market data is available.
How much is Fourth State worth (valuation)?
Valuation information for Fourth State is not publicly available.
Can I buy Fourth State stock?
Fourth State 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 Fourth State's last funding round?
Fourth State's most recent funding round was Grant on April 8, 2026.
Who are the main investors in Fourth State?
Key investors in Fourth State include Cyclotron Road, U.S. Department of War, California Energy Commission, Activate, Department of Energy.
Will Fourth State IPO soon?
No public IPO plans have been announced for Fourth State.
How can I track Fourth State secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor Fourth State's secondary market activity and sign up for updates.