Antares
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Investors
Founders
About
Antares is a nuclear fission energy company developing compact small modular microreactors (SMRs) for defense and space applications 123. On 2026-07-27, the company announced a $470 million Series C round consisting of $370 million in equity and $100 million in debt, co-led by Paradigm and Caffeinated Capital, with participation from Point72 Ventures, Shine Capital, and Industrious Ventures 123. The financing brings total funding to over $604 million and follows the company’s Series B of $96 million in December 2025 23. Antares’ Mark-0 demonstration microreactor achieved criticality on June 4, 2026 at Idaho National Laboratory under the DOE Reactor Pilot Program — the first private advanced reactor criticality in decades 12. The reactors use TRISO fuel (uranium encapsulated in carbon and ceramic shells) cooled by gases such as helium or molten salts and produce 100 kilowatts to 1 megawatt of electricity 1. Antares is one of three Pentagon finalists for the Advanced Nuclear Power for Installations program, targeting first electricity production in 2027 and initial military deployment by 2028 12.
Disclaimer: This is a lean profile built from initial round coverage and may be expanded as more information becomes available.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2025-12 | Series B | $96M | — | — 4 |
| 2026-07-27 | Series C | $470M ($370M equity + $100M debt) | Paradigm, Caffeinated Capital | Point72 Ventures, Shine Capital, Industrious Ventures 123 |
What Investors Say
“Now they transition to a new era: The scaled deployment of microreactors that can operate reliably, safely, and economically for years on U.S. military bases.”
— Alana Palmedo, Managing Partner, Paradigm, on the Series C round 2.
“Antares stands apart in the advanced nuclear space by delivering concrete results, such as winning the race to criticality and securing major customers like the U.S. Air Force.”
— Varun Gupta, Caffeinated Capital, on the Series C round 2.
What Founders Say
“The military has been a partner to us every step of the way… To do that, we’re announcing $470M of equity and debt to invest one-to-one with the taxpayer.”
— Jordan Bramble, CEO of Antares, on the Series C round 2.
Sources
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“Antares raises $470M to build nuclear reactors for the U.S. military,” TechCrunch, July 27, 2026. Accessed July 2026. https://techcrunch.com/2026/07/27/antares-raises-470m-to-build-nuclear-reactors-for-the-u-s-military/↩↩↩↩↩↩
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“Antares Raises $470M Series C to Deploy Nuclear Microreactors for Critical Missions,” Yahoo Finance / BusinessWire, July 27, 2026. Accessed July 2026. https://finance.yahoo.com/energy/articles/antares-raises-470m-series-c-113000270.html↩↩↩↩↩↩↩↩↩
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“Antares Raises $470M Series C to Deploy Nuclear Microreactors for Critical Missions,” BusinessWire press release, July 27, 2026. Accessed July 2026. https://www.businesswire.com/news/home/20260727569769/en/Antares-Raises-$470M-Series-C-to-Deploy-Nuclear-Microreactors-for-Critical-Missions↩↩↩↩
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“Antares Raises $96 Million in Series B Funding to Accelerate Nuclear Microreactor Development,” BusinessWire press release, December 2, 2025. Accessed July 2026. https://www.businesswire.com/news/home/20251202017776/en/Antares-Raises-$96-Million-in-Series-B-Funding-to-Accelerate-Nuclear-Microreactor-Development↩