Antares
Builds the R1 microreactor, a 100 kW to 1 MW nuclear power unit for military installations and spacecraft, in a Torrance factory sized for ten units a year.
USAF maintainers inspect C-130J engines at Ramstein, Germany. Photo: U.S. Air Force photo by Senior Airman Andrew Bertain, Public domain (PD-USGov-Military-Air Force).
Funding history
| Date | Round | Amount |
|---|---|---|
| Jul 2026 | Series C | $470M |
Why it matters
Mark-0 reactor reached criticality at Idaho National Laboratory in June 2026; DIU ANPI finalist; $161M DoD award in Sep 2026 for a space reactor demonstration.
Is Antares publicly traded?
Antares is privately held as of November 14, 2026: there is no ticker and no announced IPO. Shares are not available on public exchanges.
Information only, not investment advice.
Some figures rest on a single report. Treat them as indicative.Last verified November 14, 2026
Antares: key questions
What does Antares do?
Builds the R1 microreactor, a 100 kW to 1 MW nuclear power unit for military installations and spacecraft, in a Torrance factory sized for ten units a year.
What does Antares make?
Products named by Antares include R1 and Mark-0.
Where is Antares based?
Antares is headquartered in Torrance, California. It was founded in 2023.
How much funding has Antares raised?
Total funding is ~$600M, based on announced and reported rounds. Latest round: Series C, $470M, Jul 2026.
Who are Antares' investors?
Notable investors include Paradigm, Caffeinated Capital, Shine Capital, Point72 Ventures, Industrious Ventures, Alt Capital.
Is Antares publicly traded?
Antares is privately held as of November 14, 2026: there is no ticker and no announced IPO. Shares are not available on public exchanges.
Can you buy Antares stock?
Not on a public exchange: Antares is a private company. Shares of private companies change hands only in private transactions open to accredited investors, when the company allows it. This is not investment advice.
Sources
- ans.org/news/article-7594/antares-raises-funds-for-microreactor-development
- nucnet.org/news/us-startup-raises-usd470-million-to-build-reactors-for-military-bases-7-2-
Figures come from company announcements, government sources and press reports. Spot an error? Send a correction. Nothing here is investment advice.
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