Company profile
Arnold Magnetic Technologies: what it does, projects, funding and status (2026)
Processing / manufacturing (operating) Subsidiary of Compass Diversified (NYSE: CODI) HQ: Rochester, New York
Arnold Magnetic Technologies, headquartered in Rochester, New York and a subsidiary of Compass Diversified (NYSE: CODI), is a magnet and precision-component maker with more than 130 years of history that fabricates samarium cobalt magnets in Rochester and has plants in four other countries. It signed a non-exclusive sales and distribution agreement with USA Rare Earth on Mar 23, 2026.
Verified through Oct 1, 2026
Status and timeline Report a correction All US rare earth companies
What does Arnold Magnetic Technologies do?
Arnold Magnetic Technologies makes high-performance permanent magnets, precision foil, flexible composites and engineered magnetic assemblies for aerospace, defense, industrial, medical and energy customers. It works at the magnet step, with samarium cobalt as its core rare earth product.
At its Rochester headquarters Arnold fabricates and tests samarium cobalt (SmCo) magnets and builds custom assemblies, most of which go to aerospace and defense programs. It also produces RECOMA samarium cobalt, alnico, injection-molded and Flexmag flexible magnets to customer designs.
Samarium cobalt magnets do not use dysprosium or terbium, and samarium is one of the seven elements China placed under export licensing in Apr 2025. See the US sources of samarium and SmCo magnets page.
Which assets and facilities does Arnold Magnetic Technologies operate?
Arnold operates a Rochester, New York technology center and manufacturing site and plants in the United Kingdom, Switzerland, Thailand and China. A newly commissioned Thailand plant is meant to more than double its SmCo output, and its US sintering capacity is not stated.
| Asset | Location | What it does | Size or output | Status |
|---|---|---|---|---|
| Technology center and manufacturing | Rochester, New York | SmCo magnet fabrication, testing and assemblies | Not stated | Operating |
| Thailand magnet plant | Thailand | Samarium cobalt magnets | More than doubles SmCo output; doubling targeted by 2027 | Commissioned |
| Other sites | United Kingdom, Switzerland, China | Magnets and precision components | Not stated | Operating |
Arnold reports more than $50M invested over five years in facility improvements, technology upgrades and expansion. The sources checked do not break out US versus overseas magnet output.
Who buys from Arnold Magnetic Technologies and where does it get its materials?
Arnold serves more than 2,000 customers worldwide in aerospace and defense, general industrial, motorsport, oil and gas, medical and energy markets. It sources samarium outside China, including through 2025 supply agreements with Less Common Metals and Solvay.
The 2025 agreements give Arnold guaranteed access to premium rare earth oxides and alloys, including samarium oxide for SmCo magnets. In Mar 2026 Arnold and USA Rare Earth announced a mutual, non-exclusive distribution partnership that pairs Arnold's precision magnets with USA Rare Earth's domestic NdFeB capability.
What is the timeline of Arnold Magnetic Technologies?
Arnold secured samarium supply from Less Common Metals and Solvay in 2025, commissioned a Thailand SmCo plant and signed a distribution agreement with USA Rare Earth on Mar 23, 2026. The Thailand expansion targets a doubling of SmCo output by 2027.
- 2025
Arnold signs supply agreements with Less Common Metals and Solvay for samarium and other rare earth materials.
- 2025 to 2026
Arnold commissions a new magnet facility in Thailand to more than double its SmCo output.
- Mar 23, 2026
Arnold and USA Rare Earth sign a non-exclusive sales and distribution agreement.
Next milestones
- 2027
Thailand expansion is expected to double magnet capacity.
What government support has Arnold Magnetic Technologies received?
Arnold has no federal grant, loan or equity stake in the sources checked. It sells to defense programs and benefits from sourcing rules that favor non-Chinese magnets, but no direct award is recorded.
No federal support is recorded for Arnold Magnetic Technologies in the sources checked.
The DFARS rule starting Jan 1, 2027 affects defense buyers of rare earth magnets. See the DFARS 2027 rare earth rule.
What are the risks and unknowns for Arnold Magnetic Technologies?
The main unknowns are how much of Arnold's samarium cobalt output is made in the United States, whether its non-China samarium supply scales and how the USA Rare Earth link develops. This directory reports facts and gives no investment view.
- US output: the sources checked name Rochester fabrication but do not give US sintering capacity.
- Samarium supply: samarium oxide outside China is scarce; the 2025 agreements help but depend on suppliers' output.
- Non-exclusive partnership: the USA Rare Earth deal does not commit volumes.
- Overseas production: new SmCo capacity is in Thailand, not the US.
Questions about Arnold Magnetic Technologies
Who owns Arnold Magnetic Technologies?
Arnold Magnetic Technologies is a subsidiary of Compass Diversified (NYSE: CODI) and is headquartered in Rochester, New York.
What does Arnold Magnetic Technologies make?
High-performance permanent magnets including samarium cobalt, alnico and NdFeB, plus precision foil, flexible composites and engineered magnetic assemblies, mainly for aerospace and defense.
Does Arnold make samarium cobalt magnets in the US?
Arnold fabricates and tests samarium cobalt magnets at its Rochester, New York headquarters. A newer Thailand plant is meant to more than double its SmCo output, and US sintering capacity is not stated.
What is the Arnold and USA Rare Earth agreement?
On Mar 23, 2026 the two companies signed a non-exclusive sales and distribution agreement, combining Arnold's precision magnet expertise with USA Rare Earth's domestic NdFeB capabilities.
Where does Arnold get samarium?
Arnold has a strategic agreement to source samarium outside China and 2025 supply agreements with Less Common Metals and Solvay for samarium oxide and other materials.
Sources and verification
Each profile lists its sources, a confidence grade and a verification date. Order of authority: official records (SEC filings, agency documents), company documents and technical reports, research papers, then independent press. Syndicated copies and reference works are labeled and are never the only source for a number. Company-reported figures are labeled as such, and non-binding deals are labeled "letter of intent" or "conditional".
- OSTI review, Minerals Engineering 249 (Kashyap et al., 2026) Research paper
- Arnold Magnetic Technologies: strategic investments and agreements for rare earth supply continuity Company document
- Arnold: strategic expansion of Thailand operations Company document
- Arnold: who we are Company document
- Metal.com: Arnold Magnetic expands Thai plant, doubles magnet capacity by 2027 Independent press
- Metal Powder Tech: Arnold and USA Rare Earth distribution agreement (Mar 2026) Independent press
- Compass Diversified 10-K (SEC) Official record
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