# Antares

> Antares is a nuclear fission energy company building factory-produced, transportable microreactors that deliver strategic power for mission-critical systems across land, sea, and space. Founded in 2023 and headquartered in Torrance, California, its R1 reactor uses TRISO fuel, sodium heat pipes, and a nitrogen Brayton cycle to produce 100kWe-1MWe for six-plus years. In June 2026 its Mark-0 reactor became the first privately developed advanced reactor to achieve criticality under the U.S. Department of Energy's Reactor Pilot Program.

- **Founded:** 2023
- **Headquarters:** Torrance, California, United States
- **Founders:** Jordan Bramble (Co-Founder & CEO), Julia DeWahl (Co-Founder & President)
- **Team size:** ~110 employees
- **Products:** R1 Microreactor, Mark-0, Special-purpose reactor systems
- **Notable:** First privately developed advanced reactor to achieve initial criticality under the DOE Reactor Pilot Program (June 4, 2026, at Idaho National Laboratory)., Raised $96M Series B in December 2025; $140M+ raised since founding in 2023., Built a ~145,000 sq ft manufacturing facility in Torrance, California, designed to produce ~10 reactor units per year.

## Products & services

- **R1 Microreactor** — A transportable microreactor producing 100kWe to 1MWe for 6+ years, using TRISO coated-particle fuel in a prismatic graphite core, sodium heat pipes for passive heat transfer, and a nitrogen Brayton cycle for power conversion, with integrated shielding and a transport cradle.
- **Mark-0** — An early demonstration reactor that achieved initial criticality on June 4, 2026, at Idaho National Laboratory under the DOE Reactor Pilot Program - the first privately developed advanced reactor to reach criticality under that program.
- **Special-purpose reactor systems** — Modular, transportable reactor platforms with automated control systems, digital twins, high-temperature heat pipes and radiators, and in-house nuclear-grade graphite machining.

## Achievements

- First privately developed advanced reactor to achieve initial criticality under the DOE Reactor Pilot Program (June 4, 2026, at Idaho National Laboratory).
- Raised $96M Series B in December 2025; $140M+ raised since founding in 2023.
- Built a ~145,000 sq ft manufacturing facility in Torrance, California, designed to produce ~10 reactor units per year.
- Selected by the Department of the Air Force for a proposed microreactor deployment at Joint Base San Antonio.
- Reached reactor criticality less than three years after founding.

## Latest updates

- **2026-06** — Mark-0 reactor achieved initial criticality at Idaho National Laboratory - first private advanced reactor to do so under the DOE Pilot Program.
- **2026-04** — Selected by the Department of the Air Force for proposed microreactor deployment at Joint Base San Antonio under the ANPI initiative.
- **2025-12** — Closed $96M Series B led by Shine Capital to accelerate microreactor development.
- **2025-08** — Named one of 11 participants in the DOE Reactor Pilot Program.

## Links

- Website: https://antaresindustries.com
- LinkedIn: https://www.linkedin.com/company/antares-industries
- Twitter/X: https://twitter.com/AntaresNuclear
- YouTube: https://www.youtube.com/watch?v=uIEsJiYxaEo

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Profile page: https://yespress.io/antares
Published by YesPress — https://yespress.io
Last updated: 2026-06-10