# Antares Nuclear

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/antares-nuclear

- Industry: Power & Utilities
- Headquarters: Torrance, US
- Website: www.antaresindustries.com/
- Total disclosed funding: $409M
- Latest round: Series C (Jul 8, 2026)
- Investors on record: 14

## About

Based in California, US, and founded in 2023, Antares Nuclear, Inc. specializes in advanced microreactor technology, with a key focus on the Antares R1 reactor. In July 2026, Antares Nuclear, Inc. raised USD 419 million in equity and venture debt funding co-led by Paradigm and Caffeinated Capital, with participation from Industrious Ventures, Shine Capital, Point72.  The round was part of a larger USD 419 million series C and venture debt funding.

Antares specializes in the development of advanced microreactor technology, particularly its flagship product, the Antares R1 reactor. This microreactor is engineered for rapid deployment in both terrestrial and space-based applications, emphasizing critical infrastructure resilience. Designed to be transportable on standard 463L pallets or within a single CONEX container, it allows for deployment in austere and remote environments. With built-in shielding features and sodium heat pipes, the R1 reactor ensures operational reliability and safety while minimizing the exclusion zone during deployment. Its core combines high-assay low-enriched uranium (HALEU) TRISO fuel with graphite moderation and reflective properties, catering to a diverse client base that includes government agencies and private enterprises focusing on energy solutions in the aerospace and defense sectors. The company actively markets its products in North America, Europe, and select regions in Asia, aiming to address the growing need for reliable energy sources in both remote locations and space missions. 

Antares generates revenue through direct sales and partnerships within the B2B sector, focusing on government contracts and commercial agreements with aerospace and defense industries. Transactions are structured around the sale of the R1 reactor, which may involve personalized contracts tailored to client needs, encompassing installation, maintenance, and operational training. Clients generally engage in one-time purchases or subscription-based models that include ongoing support services. 

The company plans to use the July 2026 funding to expand microreactor manufacturing and deliver power systems to military sites.

## Funding rounds

- Series C, Jul 8, 2026, $320M — Caffeinated Capital, Point72, Shine Capital, Paradigm, Industrious Ventures
- Series B, Sep 10, 2025, $51M — Caffeinated Capital, Industrious Ventures, Shine Capital, Altman Capital, 53 Stations
- Series A, Oct 30, 2024, $30M — BoxGroup, Rogue Venture Partners, Caffeinated Capital, Shrug Capital, Shine Capital, Uncommon Capital, Banter Capital, Altman Capital
- Seed, Oct 31, 2023, $8M — Rogue Venture Partners, Caffeinated Capital, Pathbreaker Ventures, Shrug Capital, Uncommon Capital, Humba Ventures

## Investors

- Rogue Venture Partners (https://capitalatlas.ai/funds/rogue-venture-partners) — Seed, Series A
- Caffeinated Capital (https://capitalatlas.ai/funds/caffeinated-capital) — Seed, Series A, Series B, Series C
- Pathbreaker Ventures (https://capitalatlas.ai/funds/pathbreaker-ventures) — Seed
- Shrug Capital (https://capitalatlas.ai/funds/shrug-capital) — Seed, Series A
- Uncommon Capital (https://capitalatlas.ai/funds/uncommon-capital) — Seed, Series A
- Humba Ventures — Seed
- BoxGroup (https://capitalatlas.ai/funds/boxgroup) — Series A
- Shine Capital — Series A, Series B, Series C
- Banter Capital (https://capitalatlas.ai/funds/banter-capital) — Series A
- Altman Capital (https://capitalatlas.ai/funds/altman-capital) — Series A, Series B
- Industrious Ventures (https://capitalatlas.ai/funds/industrious-ventures) — Series B, Series C
- 53 Stations (https://capitalatlas.ai/funds/53-stations) — Series B
- Point72 (https://capitalatlas.ai/funds/point72) — Series C
- Paradigm (https://capitalatlas.ai/funds/paradigm) — Series C