Antares Nuclear

Antares Nuclear

Develops autonomous microreactors for remote power

Overview

Preparing company description.

About Antares Nuclear

Simplify's Rating
Why Antares Nuclear is rated
B-
Rated B on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

Government & Public Sector

Energy

Aerospace

Defense

Company Size

51-200

Company Stage

Series B

Total Funding

$126M

Headquarters

Los Angeles, California

Founded

2023

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Simplify's Take

What believers are saying

  • Raised $96M Series B in December 2025 to fund R1 factory and fuel fabrication.
  • Selected for USAF JBSA microreactor deployment targeting 2028 operations.
  • First to receive DOE approval for demonstration before July 4, 2026.

What critics are saying

  • X-energy's Xe-Mobile secures DoD contracts with faster licensing by mid-2027.
  • Deep Fission's exclusive HALEU delays Antares fuel, missing 2027 demo.
  • Idaho National Lab delays past July 2026 trigger sodium heat pipe failures.

What makes Antares Nuclear unique

  • Antares R1 uses TRISO fuel and sodium heat pipes for passive cooling in austere environments.
  • Tungsten and boron carbide shielding enables transport in standard shipping containers.
  • Graphite core with boron carbide drums adapts terrestrial design for space missions.

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Funding

Total Funding

$126M

Above

Industry Average

Funded Over

3 Rounds

Debt funding comparison data is currently unavailable. We're working to provide this information soon!
Debt Funding Comparison
Coming Soon

Benefits

Health Insurance

Dental Insurance

Vision Insurance

401(k) Retirement Plan

Flexible Work Hours

Remote Work Options

Paid Vacation

Paid Sick Leave

Paid Holidays

Hybrid Work Options

Wellness Program

Mental Health Support

Gym Membership

Phone/Internet Stipend

Home Office Stipend

Professional Development Budget

Conference Attendance Budget

Stock Options

Company Equity

Relocation Assistance

Parental Leave

Family Planning Benefits

Fertility Treatment Support

Adoption Assistance

Childcare Support

Elder Care Support

Pet Insurance

Bereavement Leave

Tuition Reimbursement

Professional Certification Support

Mentorship Program

Training Programs

Tuition Reimbursement

Growth & Insights and Company News

Headcount

6 month growth

1%

1 year growth

-1%

2 year growth

0%
Bloomberg L.P.
Apr 8th, 2026
Nuclear startup Antares wins key approval to complete demonstration reactor under US programme

Antares Nuclear Inc., a California-based startup developing small reactors, has become the first company to receive approval from federal regulators to complete its demonstration system under a US programme designed to accelerate new fission technologies. The approval from the Department of Energy marks a significant milestone for the nuclear startup as it works to advance small modular reactor technology.

Business Wire
Dec 3rd, 2025
Antares Raises $96 Million in Series B Funding to Accelerate Nuclear Microreactor Development

Antares, an advanced nuclear energy startup, today announced the close of its $96 million Series B funding round. The round was led by Shine Capital, with pa...

Startup Ecosystem Canada
Dec 3rd, 2025
Antares Raises $96M for Microreactor Development for Diverse Energy Applications

Antares raises $96M for microreactor development for diverse Energy applications. News summary. Antares, a nuclear startup, has successfully raised $96 million in a Series B funding round to advance its small modular reactor design, known as the R1 microreactor. This funding includes $71 million in equity and $25 million in debt, with participation from Shine Capital, Alt Capital, Caffeinated, FiftyThree Stations, and Industrious. The R1 microreactor is designed for commercial, defense, and space-based applications, producing between 100 kilowatts and 1 megawatt of electricity using TRISO fuel. The startup's progress follows a renewed interest in nuclear power, evidenced by significant investments in similar companies like X-energy, Deep Fission, Aalo Atomics, and TerraPower. Antares aims to demonstrate its reactor for the Department of Energy next year, with plans to activate its full-power reactor by 2027. Story coverage.

FinSMEs
Dec 2nd, 2025
Antares Raises $96M in Series B Funding

Antares raises $96M in Series B funding. Antares, a Torrence, CA-based nuclear energy startup, raised $96M in Series B funding. The round was led by Shine Capital, with participation from Alt Capital, Caffeinated, FiftyThree Stations, Industrious, and other investors, bringing its total amount to date to over $130M in funding. It consisted of $71M in new equity capital and $25M in debt for equipment, factory build-out, and uranium procurement. Led by CEO Jordan Bramble, Antares is building compact nuclear microreactors to deliver energy where it's needed most: * remote military bases, * austere industrial sites, * and, one day, deep space and underwater missions. With operations in Torrance, California; Idaho Falls, Idaho; and Aiken, South Carolina, and a team of 60, Antares is working to demonstrate a low-power test reactor before July 4, 2026, and to test its electricity-producing demonstration unit in 2027. Production units will be deployed as early as 2028.

Business Wire
Dec 2nd, 2025
Antares raises $96M Series B to accelerate nuclear microreactor development

Antares, an advanced nuclear energy startup, has closed a $96 million Series B funding round led by Shine Capital. The round includes $71 million in new equity and $25 million in debt for equipment, factory build-out and uranium procurement. Participants include Alt Capital, Caffeinated, FiftyThree Stations, Industrious and other investors. The Washington-based company is developing nuclear microreactors. CEO Jordan Bramble said the capital will accelerate the company's mission to deliver its technology, though specific deployment timelines were not disclosed.

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