R1 Microreactor
A modular microreactor power system for defence applications.
Maturity not rated
- Contract award
- Aug 26, 2026
Startup · United States
Antares
HQ TorranceFounded 202351-200 employees
Nuclear microreactor developer building deployable power systems for the U.S. military.
Sep 11, 2026CompanyAntares Selected for $161M Strategic Breakthrough Award to Demonstrate Space ReactorBusiness WireAug 26, 2026CompanyAntares Awarded Army Janus Agreement at Fort BraggAntaresAug 26, 2026NewsU.S. Army Mobilizes $2.2B Janus Program to Deploy More Than 20 Commercial MicroreactorsPOWER MagazineAug 26, 2026Government record (high significance)Army reaches agreement with private industry for nuclear micro-reactorsU.S. ArmyAug 26, 2026News (high significance)Army to host nuclear microreactors at Forts Bragg, Campbell, Hood, Benning and DrumDefenseScoop
- Sep 11, 2026CompanyBusiness WireAntares Selected for $161M Strategic Breakthrough Award to Demonstrate Space Reactor
- Aug 26, 2026CompanyAntaresAntares Awarded Army Janus Agreement at Fort Bragg
- Aug 26, 2026NewsPOWER MagazineU.S. Army Mobilizes $2.2B Janus Program to Deploy More Than 20 Commercial Microreactors
- Aug 26, 2026Government record (high significance)U.S. ArmyArmy reaches agreement with private industry for nuclear micro-reactors
- Aug 26, 2026News (high significance)DefenseScoopArmy to host nuclear microreactors at Forts Bragg, Campbell, Hood, Benning and Drum
Funding5 rounds · $504M
- Equity raised
- $504M
- Debt, secondaries & grants
- $100M
- Latest
- $100MDebt · Jul 27, 2026
Oct 30, 2023Jul 27, 2026
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| Jul 27, 2026 | Debt | $100M | — | — | — | Confirmed |
| Jul 27, 2026 | Series C | $370M | — | Caffeinated Capital, Paradigm | Industrious Ventures, Point72 Ventures, Shine Capital | Confirmed |
| Dec 2, 2025 | Series B | $96.0M | — | Shine Capital | Alt Capital, Caffeinated Capital, Industrious Ventures | Confirmed |
| Oct 31, 2024 | Series A | $30.0M | — | Alt Capital, Caffeinated Capital | BoxGroup, Shine Capital | Confirmed |
| Oct 30, 2023 | Seed | $8.1M | — | — | — | Confirmed |
- DebtConfirmed$100MJul 27, 2026
- $370MJul 27, 2026
- $96.0MDec 2, 2025
- $30.0MOct 31, 2024
- SeedConfirmed$8.1MOct 30, 2023
Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.
Programs2 programs
Programs2
| Program | Role | Program status | Confidence |
|---|---|---|---|
| Advanced Nuclear Power for Installations | Prime | Development | Confirmed |
| Janus Program | Prime | Development | Confirmed |
Systems1
Newest unveiled first. Open a system for its milestone timeline, components and sources.
Capabilities2
| Technology | Role | Maturity | TRL | Notes | Confidence |
|---|---|---|---|---|---|
| Microreactors | Developer | Prototype | — | Mark-0 reached zero-power criticality at INL on 2026-06-04 (first under the DOE Reactor Pilot Program); Army Janus awardee (Fort Bragg). | Reported |
| Space fission power and propulsion | Developer | Development | — | — | Reported |
- DeveloperMark-0 reached zero-power criticality at INL on 2026-06-04 (first under the DOE Reactor Pilot Program); Army Janus awardee (Fort Bragg).PrototypeReported
Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.
Supply Chain1 facility
Facilities1
| Facility | Kind | Location | Status | Confidence |
|---|---|---|---|---|
| Antares Torrance facility | Factory | Torrance, California, United States | Operating | Reported |
- Antares Torrance facilityFactory · Torrance, California, United StatesOperatingReported
People3
- Jordan Bramble · LinkedIn ↗
CEO
- Julia DeWahl · LinkedIn ↗
Founder
- Rian Bahran · LinkedIn ↗
Chief Nuclear Officer
Hiring Observations10 observed listings
Los Angeles · Full-time · Other
Availability unverified · Black Flag job board
Checked Oct 5, 2026
General Application for Engineers ↗
Los Angeles · Full-time · Other
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Checked Oct 5, 2026
Los Angeles · Full-time · Engineering
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Los Angeles · Full-time · Manufacturing
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Manufacturing Engineer - Integration ↗
Los Angeles · Full-time · Manufacturing
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Manufacturing Engineer - Supply Chain ↗
Los Angeles · Full-time · Manufacturing
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Mechanical Design & Integration Engineer - Space ↗
Los Angeles · Full-time · Engineering
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Los Angeles · Full-time · Engineering
Availability unverified · Black Flag job board
Checked Oct 5, 2026
Nuclear Instrumentation and Controls Test Engineer ↗
Los Angeles · Full-time · Engineering
Availability unverified · Black Flag job board
Checked Oct 5, 2026
A sample of observed listings, not a total vacancy count. Availability may have changed since collection. Categories are inferred from job titles.
Sources38
Show all 38 sources and supporting evidence
Profile5
- 1
Dow Jones via Morningstar · Jul 27, 2026 · Supports Organization
“The nuclear-energy startup said Monday that the funding round was co-led by Paradigm and Caffeinated Capital”
- 2
cbinsights.com · Supports Organization · founded year
“Antares was formerly known as Antares Industries. It was founded in 2023 and is based in Torrance, California.”
- 3
Black Flag · Supports Organization
“Designs and manufactures compact nuclear microreactors to provide reliable, mobile energy solutions for critical and hard-to-reach locations, including remote”
- 4
LinkedIn · Supports Organization · employee range
“employee_range: 51-200 (profile: 51-200 employees)”
- 5
Systems2
- 6
U.S. Army · Aug 26, 2026 · Supports Organization technology, System · system technology:microreactors
“The five selected vendors and installations are as follows: - Antares Nuclear, Inc. – Fort Bragg, North Carolina - BWXT Advanced Technologies, LLC – Fort Campbell, Kentucky - General Atomics Electromagnetic Systems – Fort Hood, Texas - Radiant Industries, Inc. – Fort Benning, Georgia - Westinghouse Government Services – Fort Drum, New York”
- 7CompanyAntares — official website
Antares · Supports Organization · website, Organization technology, System
“We design and manufacture modular, transportable reactors for strategic energy applications on Earth and in space.”
Technologies2
- 8Government recordDepartment of Energy Celebrates First Advanced Reactor Criticality
U.S. Department of Energy · Jun 4, 2026 · Supports Organization technology
“Today, as part of the U.S. Department of Energy (DOE) Reactor Pilot Program, Antares Nuclear’s advanced reactor design, the Mark-0, successfully completed a zero-power fueled criticality demonstration at DOE's Idaho National Laboratory.”
- 9
Antares Nuclear · Supports Organization · name, Organization technology
“Antares Nuclear: Factory-Produced Fission Microreactors for Strategic Energy”
Funding7
- 10
TechCrunch · Dec 2, 2025 · Supports Funding round · amount
“Nuclear startup Antares said Tuesday it has raised $96 million in Series B funding as it pursues its small modular reactor design.”
- 11Regulatory filingAntares Nuclear, Inc. - SEC Form D (0001998786-25-000002)
U.S. Securities and Exchange Commission · Sep 19, 2025 · Supports Funding round
“Total Amount Sold $ 51,045,266 USD”
- 12
Crowell & Moring · Oct 31, 2024 · Supports Funding round · amount
“has successfully raised $30 million in Series A financing, bringing their total capital raised to over $38 million”
- 13Regulatory filingAntares Nuclear, Inc. - SEC Form D (0001998786-24-000002)
U.S. Securities and Exchange Commission · Oct 9, 2024 · Supports Funding round
“Total Amount Sold $ 27,529,968 USD”
- 14Regulatory filingAntares Nuclear, Inc. - SEC Form D (0001998786-23-000001)
U.S. Securities and Exchange Commission · Oct 30, 2023 · Supports Funding round
“Total Amount Sold $ 8,116,498 USD”
- 15CompanyAntares
Supports Funding round, Funding round · investors
“The capital, which includes $370 million in equity and $100 million in debt, comes weeks after Antares took its Mark-0 reactor critical at Idaho National Laboratory. It was the first privately developed non-light-water reactor to achieve criticality in the United States in more than four decades. Antares met the milestone on schedule, validating reactor physics, reactivity”
- 16
PitchBook · Supports Funding round, Organization · employee range
“Seed Round”
Supply chain1
- 17
Los Angeles Times · Dec 3, 2025 · Supports Facility
“It operates from a 145,000-square-foot facility in”
People2
- 18OtherBlack Flag 100
Black Flag · Supports Organization, Role
“Antares is pioneering the development of transportable microreactors to provide resilient, clean energy for military and strategic applications on Earth, in”
- 19
Crunchbase via Bright Data · Supports Role
“Founders: Jordan Bramble, Julia DeWahl”
Other19
- 20
Black Flag · Supports Job posting
“Executive Assistant, CEO”
- 21
Black Flag · Supports Job posting
“General Application for Engineers”
- 22
Black Flag · Supports Job posting
“Head of Finance”
- 23
Black Flag · Supports Job posting
“Licensing Engineer”
- 24
Black Flag · Supports Job posting
“Manufacturing Engineer”
- 25
Black Flag · Supports Job posting
“Manufacturing Engineer - Integration”
- 26
Black Flag · Supports Job posting
“Manufacturing Engineer - Supply Chain”
- 27
Black Flag · Supports Job posting
“Mechanical Design & Integration Engineer - Space”
- 28
Black Flag · Supports Job posting
“Mission Engineer”
- 29
Black Flag · Supports Job posting
“Nuclear Instrumentation and Controls Test Engineer”
- 30
- 31
Black Flag · Supports Job posting
“Senior Civil / Structural Engineer”
- 32
Black Flag · Supports Job posting
“Senior Controls Engineer - Mechanical / Mechanisms”
- 33
Black Flag · Supports Job posting
“Senior Electrical R&D Specialist”
- 34
Black Flag · Supports Job posting
“Senior Mechanical / Thermal Engineer - Heat Transfer Systems”
- 35
Black Flag · Supports Job posting
“Senior Mechatronics Engineer”
- 36
Black Flag · Supports Job posting
“Senior Nuclear Engineer”
- 37
Black Flag · Supports Job posting
“Senior Turbomachinery Engineer”
- 38
Black Flag · Supports Job posting
“Software Engineer - Backend / Embedded”
Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.