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Antares logo
Climate/Energy
Industrial/Manufacturing
Space/Defense

Antares

Purpose-designed modular power for defense-critical assets

CORE INFO

$470
Total Funding
Series C
Round
2023
Founded
~65 employees
Team Size
Torrance, California, USA
Headquarters

Antares develops compact nuclear microreactors designed to provide reliable and transportable energy solutions for defense, space, and critical infrastructure applications. Their technology is particularly suited for remote environments, offering continuous power without external resupply for extended periods.

  • Antares raised $470 million in a Series C funding round led by Paradigm and Caffeinated Capital, announced on July 27, 2026.chroniclejournal.com
  • The company serves notable clients such as the U.S. Air Force, NASA, and the Department of Energy.startupintros.com
  • TechRadar reported on Antares' $470 million Series C funding and its plans to supply microreactors to the US military.techradar.com

WHY WE WOULD WORK AT ANTARES

Innovative Energy Solutions

Join a pioneering team developing compact nuclear microreactors like the R1, designed to provide reliable energy for defense and space applications.

Impactful Mission

Contribute to a mission that aims to make clean energy abundant from Earth to the asteroid belt, enhancing the American standard of living.

Collaborative Culture

Be part of a close-knit team of approximately 65 employees, fostering collaboration and innovation in a dynamic startup environment.

Strong Funding Backing

Benefit from over $470 million in funding, ensuring financial stability and resources to drive groundbreaking projects forward.

Notable Clients

Work with prestigious clients like NASA and the U.S. Air Force, making a tangible impact on national security and space exploration.

Cutting-Edge Technology

Engage with advanced technologies, including TRISO fuel and sodium heat pipes, to revolutionize energy production in remote environments.

MARKET AND TRACTION

TOTAL ADDRESSABLE MARKET

  • Antares targets the defense, space, and critical infrastructure sectors, which are increasingly seeking reliable and autonomous energy solutions.

  • The demand for compact nuclear microreactors is expected to grow as governments and organizations prioritize energy independence and sustainability in remote operations.

    • NOTABLE CUSTOMERS

  • Antares serves significant public entities, including the U.S. Air Force, NASA, and the Department of Energy, highlighting its credibility and strategic importance in national security and space exploration.

  • These partnerships position Antares as a key player in the transition to advanced energy solutions for critical missions.

    • KEY METRICS

    ✦ KEY METRIC
  • Antares has raised a total of $470 million in Series C funding, with notable investors including Paradigm and Caffeinated Capital.

  • The company has successfully tested its Mark-0 microreactor, achieving criticality, which is a significant milestone in nuclear energy development.

    • GROWTH TACTICS

  • Antares focuses on developing transportable nuclear microreactors that can operate autonomously for extended periods, catering to the needs of remote and austere environments.

  • The company aims to leverage its technology to expand its client base within the defense and energy sectors, enhancing energy security and sustainability.

    • COMPETITIVE ADVANTAGE

  • Antares's R1 microreactor is designed to produce up to one megawatt of continuous energy without external resupply for up to three years, offering a unique solution for energy challenges in critical applications.

  • The company's advanced technology and partnerships with government agencies provide a strong foundation for its competitive positioning in the nuclear energy market.

    • PRODUCT AND TECH

    R1 Microreactor

    The R1 microreactor is Antares's flagship product, designed to produce up to one megawatt of continuous energy for up to three years without external resupply. This compact nuclear microreactor is engineered for reliability and transportability, making it ideal for defense, space, and critical infrastructure applications.

    Sodium Heat Pipes

    Antares utilizes advanced sodium heat pipe technology in its microreactors to efficiently transfer heat generated during nuclear fission. This technology enhances the reactor's performance and safety, ensuring effective energy production in remote or austere environments.

    TRISO Fuel Technology

    The R1 microreactor employs TRISO (tristructural-isotropic) fuel, known for its superior safety and efficiency in nuclear reactions. This innovative fuel design allows for high-temperature operation and minimizes the risk of radioactive release, making it suitable for various applications.

    Autonomous Operation

    Antares's microreactors are designed to operate autonomously, providing continuous power without the need for external resupply. This capability is crucial for military and space missions, where reliable energy sources are essential in remote locations.

    Defense and Space Applications

    Antares focuses on providing energy solutions for defense and space sectors, serving notable clients like the U.S. Air Force and NASA. The company's microreactors are tailored to meet the unique energy demands of critical infrastructure and military operations.

    COMPANY CULTURE

    Values

  • Commitment to energy abundance

  • Focus on enhancing the American standard of living

  • Strong belief in the importance of a robust defense industrial base

  • Dedication to clean energy solutions from Earth to the asteroid belt

  • Innovation and excellence in technology development

    • Operating Principles

  • Emphasis on autonomous operation in remote environments

  • Prioritization of reliability and transportability in energy solutions

  • Continuous improvement through advanced technology and engineering

  • Collaboration with government and defense sectors for impactful solutions

    • Benefits

  • Opportunity to work on cutting-edge nuclear technology

  • Contributing to national security and critical infrastructure

  • Engaging in a mission-driven environment focused on sustainability

  • Potential for professional growth in a rapidly evolving industry

    • Team Cadence

  • Agile team structure promoting quick decision-making

  • Regular collaboration across engineering, operations, and leadership

  • Open communication channels fostering innovation and feedback

  • Emphasis on teamwork to achieve ambitious goals

    • Learning & Growth

  • Commitment to continuous learning and professional development

  • Opportunities for training in advanced nuclear technologies

  • Encouragement of innovative thinking and problem-solving

  • Support for employees to engage in industry conferences and workshops

    • COMPENSATION SNAPSHOT

    B-
    Comp score vs cohort
    vs. Climate/Energy · Series C · US
    Based on publicly available compensation ranges from job postings; exact compensation may vary.
    Engineering IC2n = 9
    $115K – $160Kmedian $138K
    Los Angeles / Bay Area
    Engineering IC3n = 6
    $112K – $173Kmedian $142K
    Los Angeles / Bay Area
    Engineering IC4n = 18
    $140K – $185Kmedian $163K
    Los Angeles / Bay Area
    Engineering IC5n = 3
    $150K – $210Kmedian $180K
    Los Angeles / Bay Area
    Operationsn = 7
    $100K – $175Kmedian $138K
    Los Angeles / Bay Area
    US-only in v1 · only categories with n > 2 shown · in-person / hybrid / remote treated separately where n ≥ 3