Fourth State
PrivateLast Round
Grant
Apr 8, 2026
Total Funding Raised
$2.57M
Momentum
Top 10%
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
SEC and related filings with document metadata.
| Typed | Date | Amount Offered | Amount Sold | Filling | Pages | Download |
|---|---|---|---|---|---|---|
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Frequently Asked Questions
Common questions about Fourth State's valuation, stock price, and market status.