Radiant Nuclear
PrivateLast Round
Series D
Dec 17, 2025
Est. Valuation
$1.8B
Total Funding Raised
$619.1M
Momentum
Top 25%
of companies Caplight tracks
Company Overview
Radiant (Alternative Energy Equipment) is a clean energy company that develops zero-emissions nuclear microreactor technology as a cost-effective and portable alternative to fossil fuels for military and commercial applications.
Sector
Energy & Sustainability
Verticals
Renewable Energy, Defense Tech, Cloud Infrastructure
Business Model
B2G
Customer Profile
Government Contracts, Hardware Sales, Services & Consulting
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Radiant Nuclear Comparables
Compare Radiant Nuclear with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Hadron Energy | 86% | |
| NANO Nuclear Energy | 83% | |
| Deployable Energy | 82% |
Radiant Nuclear Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series D | Dec 17, 2025 | ||||
| Series C | May 28, 2025 | ||||
| Series C | Oct 23, 2024 | ||||
| Series B | Apr 24, 2023 | ||||
| Grant | Mar 22, 2023 | ||||
Series A | Mar 9, 2022 |
Key People
Founding team and executive leadership
Radiant Nuclear Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Andreessen Horowitz | Series D, Series C, Series B |
| Also Capital | Series A, Seed, Series C |
| Friends & Family Capital | Series D |
| Washington Harbour Partners | Series D, Series C |
| Union Square Ventures | Series D, Series C, Series A |
| Gigascale Capital | Series C |
| Cantos Ventures | Series B |
Market signals
Structured signals derived from secondary market and firmographic data.
- Jan 1, 2028
Initial customer deliveries of Kaleidos microreactor planned for 2028.
- Jan 1, 2028
Targeting initial microreactor deliveries to begin in 2028.
Radiant Nuclear Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
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