Mass Magnetics

USA-made magnetics for aerospace, robotics and defense.

YC Summer 2026Hard TechDronesManufacturing

About Mass Magnetics

Mass Magnetics turns recycled rare-earth scrap into high-performance permanent magnets, made in America. The materials we supply are the backbone of electric motors, sensors, speakers, hard drives, and electronics. Our process enables DFARS-compliant magnets for defense, aerospace, and industrial manufacturers who demand domestic supply without compromising on quality. Operations in Greater Boston, MA (Greentown Labs) and Columbus, IN.

Founders

  • Matthew Groll

    Founder

    Co-founder and CTO at Mass Energy Company. Former NASA/Columbia/MIT. Previously worked on thermal systems and guidance/navigation at NASA Johnson Space Center for ISS and Artemis lunar missions. Also previously worked as a Member of Technical Staff at Draper Laboratory. Studied Mechanical Engineering at Columbia, captaining the Formula SAE and Robotics Club, then earned a Masters in Manufacturing from MIT.

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  • Eric Silver

    Founder

    Founder at Mass Magnetics. Worked for years in pilot cathode production for lithium-sulfur battery chemistries. Now I'm fixing American magnet supply chains.

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