Mass Magnetics
Physical AI
US maker of sintered rare-earth magnets from recycled scrap for motors, robotics and defense.
Mass Magnetics turns recycled rare-earth scrap into sintered NdFeB permanent magnets in the United States. The company says AI and robotics sort end-of-life magnets by grade, then a rapid-sintering process finishes a magnet in minutes versus hours for conventional routes, aiming at DFARS-compliant supply for defense, aerospace, robotics, drones and industrial motor makers. It states operations in Greater Boston (Greentown Labs) and Columbus, Indiana. The public thesis is that America's magnet bottleneck is manufacturing from existing scrap, not new mines. Mass Magnetics is a Y Combinator Summer 2026 company; YC lists founding year 2026 and a three-person team. No named customers are disclosed.
Research mapping
Physical AI / Materials & Critical Components (L3) / Seed
Evidence boundary
Original analysis and independent corroboration remain under development. Commercial scale and durable technical advantage remain under review.
What makes it defensible
Domestic sintered NdFeB from recycled scrap on a minutes-scale sintering cycle — the magnet layer motors, robots and DFARS defense hardware cannot import from covered countries.
Position in the stack: Materials/component supplier upstream of electric motors and actuators. Hard to copy if the scrap-sorting plus rapid-sinter process actually yields defense-grade magnets without a mine-and-refine stack.
Who buys it
Founding team
Eric Silver — Founder and CEO — Built battery pilot production lines and materials labs in the Midwest for NSF-funded companies; previously worked on lithium-sulfur cathode production
Matthew Groll — Co-founder and CTO — Mechanical engineering at Columbia and manufacturing master's at MIT; thermal systems and GNC at NASA Johnson for ISS and Artemis; former Member of Technical Staff at Draper Laboratory
SourceFinancing detail
- Last round
- Seed
Investors: Perplexity AI; SV Angel; Liquid 2 Ventures; a16z Scout Fund; Jason Miller; Y Combinator; additional MIT/NSF/accelerator backers
Mapped funds and investors
Direct relationships supported by published evidence.
Reported holdings as-of
No sourced relationships mapped yet.
Disclosed investment history
No sourced relationships mapped yet.
Showing up to four relationships in each group. ETF weights describe the fund’s portfolio, not ownership of this company. Private investment history does not establish current ownership.
Evidence & media
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Mass Magnetics — Products, Competitors, Financials (Crunchbase/CB Insights)
What this source supports: CB Insights lists Mass Magnetics as a Convertible Note-stage company with ~$500K total raised; opened preorders for recycled rare-earth magnets Aug 2026.
What it does not establish: Total raised (~$500K) differs from the DB's $50M-cap Seed framing; target customers not named.
Source -
Launch YC: Mass Magnetics — USA-made magnets
What this source supports: YC launch post: founders Eric Silver and Matthew Groll; rapid sintering (~3 minutes) from recycled scrap, AI-driven scrap sorting.
What it does not establish: First-party accelerator launch post; performance claims unverified.
Source