Antares Nuclear
PrivateLast Round
Series C
Jul 27, 2026
Total Funding Raised
$643M
Momentum
Top 5%
of companies Caplight tracks
Company Overview
Antares Nuclear is a climate and clean energy company that designs and manufactures modular, transportable fission microreactors for strategic energy applications on Earth, in space, and underwater.
Sector
Energy & Sustainability
Verticals
Defense Tech, Energy Storage
Business Model
B2G
Customer Profile
Government Contracts, Hardware Sales
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Antares Nuclear Comparables
Compare Antares Nuclear with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Radiant Nuclear | 86% | |
| Hadron Energy | 78% | |
| NANO Nuclear Energy | 77% |
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Antares Nuclear Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series C | Jul 27, 2026 | ||||
| Grant | Jun 5, 2026 | ||||
| Grant | Apr 1, 2026 | ||||
| Grant | Mar 3, 2026 | ||||
| Grant | Jan 26, 2026 | ||||
Series B | Dec 2, 2025 |
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Key People
Founding team and executive leadership
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Antares Nuclear Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Banter Capital | Seed, Series A |
| United States Department of Defense | Grant |
| U.S. Department of Defense (DIU) | Grant |
| Industrious Ventures | Series C, Series B |
| Paradigm | Series C |
| United States Air Force | Grant |
| Alt Capital | Series B, Series A |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Oct 1, 2026
Grew 25% QoQ, from 119 to 149 employees.
- Sep 1, 2026
Grew 29% QoQ, from 110 to 142 employees.
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Recent news
Latest coverage and updates
- is_developingOct 24, 2026
Antares is developing the R1-S reactor for orbital flight, using passive heat pipes rather than mechanical coolant pumps to remove heat from its nuclear core.
- is_developingSep 18, 2026
As of Sep '26, Antares is developing modular, transportable reactors fuelled with TRISO HALEU fuel.
- attends_eventSep 18, 2026
Antares attends a side event at World Nuclear Symposium 2026 in Sep '26, where its Head of Federal Strategy and Policy, Tom Mancinelli, says diverse supply sources help avoid over-reliance on single suppliers.
- is_developingSep 17, 2026
On Sep 17th '26, Antares is developing compact microreactors for critical missions on Earth and in space, while Centrus supplies HALEU under a multi-year contract with deliveries commencing before the end of the decade.
- receives_financingSep 12, 2026
In Sep '26, Antares receives a $161M Strategic Breakthrough award from the US Space Force to build space-qualified reactors.
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Antares Nuclear 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 Antares Nuclear's valuation, stock price, and market status.
Is Antares Nuclear a public or private company?
Antares Nuclear is a private company.
What is the current stock price of Antares Nuclear?
Antares Nuclear is a private company, so its shares have no public market price. Caplight tracks Antares Nuclear's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Antares Nuclear worth (valuation)?
Valuation information for Antares Nuclear is not publicly available.
Can I buy Antares Nuclear stock?
Antares Nuclear shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Antares Nuclear's last funding round?
Antares Nuclear's most recent funding round was Series C on July 27, 2026.
Who are the main investors in Antares Nuclear?
Key investors in Antares Nuclear include Paradigm, Alt Capital, Shine Capital, Caffeinated Capital.
Will Antares Nuclear IPO soon?
No public IPO plans have been announced for Antares Nuclear.
How can I track Antares Nuclear secondary market activity?
Caplight tracks bids, offers, and trades in Antares Nuclear's shares on secondary markets.