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United States
Arnold Magnetic Technologies
Sintered samarium cobalt permanent magnets sold under the RECOMA brand, a small high-temperature niche in which Arnold is one of very few Western producers. Published grades run from RECOMA 18 to RECOMA 35E, with maximum operating temperatures up to 350 degrees Celsius for the high-temperature grades. The company also makes engineered magnetic assemblies, precision thin metals, flexible magnets and, since acquiring Ramco in 2021, electric motors, stators and rotors. End markets are aerospace and defense, general industrial, motorsport, oil and gas, medical and energy.
At a glance
- Founded
- 1895 — Arnold's published history dates the lineage to 1895, when Bion J. Arnold established the Arnold Electric Power Station Company; alnico production began under the Arnold Engineering Company in 1924. The present corporate name dates from 2005, when Audax Group acquired the business and renamed it. The samarium cobalt line specifically descends from Indiana General, whose rare-earth production the company dates to 1976.
- Headquarters
- Rochester, New York, United States
- Ownership
- Owned by Compass Diversified (NYSE: CODI), which acquired the business on 5 March 2012 for approximately USD 128.8 million and reported holding 98.0% of the stock on a primary basis, 82.8% fully diluted, at 31 December 2025. The prior owner was Audax Group, which had bought the business from Precision Castparts in 2005. Because the parent is SEC-registered, Arnold is one of very few magnet makers whose results are published.
- Stage
- Arnold Magnetic Technologies: Mature. A long-running SmCo maker and NdFeB finisher in Rochester.
- Arnold Magnetic Technologies AG (Lupfig): Mature. Arnold's long-running Swiss SmCo operation, formerly Ugimag.
- Arnold Magnetic Technologies (Thailand): Ramping. Opened in October 2024, with Phase II due by mid-2027 to double capacity.
- Listing
- NYSE: CODI
Listed through its parent or partner. Owned by Compass Diversified, which reports Arnold as a segment.
Investor relations
NYSE: CODI
Listed through its parent or partner.
Investor relations - Revenue
- USD 151.0 million
Reported, full year 2025, ended 31 December 2025.
This is Compass Diversified's Arnold reporting segment, down from USD 171.8 million in 2024. It is broader than the magnet business: the segment also contains Ramco electric motors, Precision Thin Metals foil products and Flexmag flexible magnets. Rare earth magnet revenue alone is not broken out, and neither is revenue by site.
Source
Capacity
Each date below links to the document the figure came from. A capacity figure with no source is not on this page.
| What | Figure | Status | As of |
|---|---|---|---|
| Sintered samarium cobalt, Lupfig, Switzerland, sold under the RECOMA brand. The company described this site as capacity-constrained with lead-time pressure in April 2026. | no tonnage published | Operating | Apr 2026 |
| Fabrication of SmCo magnets at Rochester, New York, from block produced at Lupfig | no tonnage published | Operating | Sep 2026 |
| Amata City Chonburi, Thailand — Phase 1, magnet finishing plus rotor and stator assemblies. The factory began operating in October 2024 and Phase 1 finishing capability was completed in March 2026. | no tonnage published | Operating | Apr 2026 |
| Amata City Chonburi, Thailand — Phase 2, samarium cobalt production, shaping and finishing. Announced as a multi-million-dollar investment that the company says will double overall magnet production capacity. | full operational readiness stated for mid-2027; no tonnage published | Announced | Apr 2026 |
| NdFeB production capacity at any Arnold site | not published | Announced | Sep 2026 |
Narrative
Arnold Magnetic Technologies traces its published lineage to 1895 and is headquartered in Rochester, New York. Compass Diversified acquired a controlling interest in March 2012 for about USD 128.8 million and reported owning 98.0 percent of the stock at the end of 2025; because that parent is SEC-registered, Arnold's segment results are public, at USD 151.0 million of net sales in 2025 against USD 171.8 million in 2024. The group's distinguishing position is in samarium cobalt, sold as RECOMA and produced at Lupfig, Switzerland, with some block shipped to Rochester for fabrication. A Thailand plant at Amata City Chonburi began operating in October 2024, and Arnold announced in April 2026 that samarium cobalt production there would reach full readiness by mid-2027.
Where public sources disagree
- The scope of the Thailand increase is stated two ways by the company: a September 2025 release says the facility will more than double samarium cobalt output, while an April 2026 release says the expansion will double overall magnet production capacity. Different bases, different multipliers, and no tonnage attached to either.
- Timing shifted too. The September 2025 release reads as near-term; the April 2026 release places samarium cobalt production in Phase 2 with full readiness only by mid-2027.
- Three site capabilities recorded elsewhere could not be confirmed from any linkable source: samarium cobalt alloying at Rochester, NdFeB machining at Rochester, and block making in Thailand. What is published is narrower — Lupfig makes the SmCo, some block ships to Rochester for fabrication, and Thailand's step is described only as production, shaping and finishing.
- No publicly announced US government or defense award to Arnold was found. The company emphasizes ITAR registration and DFARS compliance, which is a compliance posture rather than an award.
- Samarium sourcing is described two ways: an undated company resource page describes a relationship with a rare earth mine in China, while a September 2025 release describes securing samarium sourcing outside China. The undated page appears to be the older statement but cannot be definitively sequenced.
- Arnold's claims to be the market leader in high-performance samarium cobalt, and that no other Western supplier has such a robust SmCo supply chain, are the company's own and are recorded as claims.
Latest reports
| Period | Published | Report |
|---|---|---|
| Q2 2026 (quarter to 30 Jun 2026) | 2026-08-10 | Compass Diversified Reports Second Quarter 2026 Financial Results |
| Q1 2026 (quarter to 31 Mar 2026) | 2026-05-06 | Compass Diversified Reports First Quarter 2026 Financial Results |
| Q4 and FY 2025 (year to 31 Dec 2025) | 2026-02-26 | Compass Diversified Reports Fourth Quarter and Full Year 2025 Financial Results |
| Q3 2025 (quarter to 30 Sep 2025) | 2026-01-14 | Compass Diversified Reports Third Quarter 2025 Financial Results |
Across these reports
Arnold's net sales fell from US$171.8M in FY2024 to US$151.0M in FY2025, then grew year on year in Q1 and Q2 2026 (US$40.2M and US$43.2M), with Adjusted EBITDA up versus the prior-year quarter in each of the last three reported quarters. CODI's reporting was delayed through 2025 by the Lugano restatement and became current in January 2026.
| Measure | What the reports show |
|---|---|
| Arnold net sales (quarterly, US$) | US$37.7M (Q3 25, vs US$46.1M Q3 24) → US$40.8M (Q4 25, vs US$41.3M) → US$40.2M (Q1 26, vs US$34.0M) → US$43.2M (Q2 26, vs US$38.4M). |
| Arnold net sales (fiscal year, calendar basis) | US$171.8M (FY2024) → US$151.0M (FY2025); H1 2026 US$83.4M vs US$72.4M in H1 2025. |
| Arnold Adjusted EBITDA (quarterly, US$) | US$4.1M (Q3 25, vs US$8.6M) → US$6.1M (Q4 25, vs US$4.7M) → US$5.1M (Q1 26, vs US$2.6M) → US$6.2M (Q2 26, vs US$4.2M); FY2025 US$16.9M vs US$27.2M in FY2024. |
| Arnold commentary | FY2025 Adjusted EBITDA add-backs include costs for relocating two of Arnold's US facilities and for the retirement of Arnold's chief executive officer (FY2025 release); |
Stated dates
| Target | First stated | Now | Status |
|---|---|---|---|
| Restatement of CODI financial statements after the Lugano irregularities | delay of Q1 2025 10-Q and need to restate 2024 announced 2025-05-07, no completion date given | achieved 8 Dec 2025 (10-K/A restating 2022-2024 filed) | met |
| Filing of the delayed Q1-Q3 2025 10-Qs (return to current SEC reporting) | 'in coming weeks' (restatement release, 2025-12-08) | achieved by 14 Jan 2026: company 'now fully current with our SEC filings for 2025' (Q3 2025 release) | met |
Figures are as the company reported them, linked to each report. This summarizes what changed between reports; it is not a view on the company or its shares.
Sources
- Compass Diversified Q4 and full-year 2025 earnings release — Arnold segment net sales — Compass Diversified, filed with the SEC (2026-02-26)
- Compass Diversified Form 10-K for 2025 — ownership percentage, acquisition date and price, segment scope — Compass Diversified, filed with the SEC (2026-02-27)
- Strategic expansion for Thailand operations — Arnold Magnetic Technologies (2026-04-28)
- Strategic investments and agreements to ensure continuity of critical rare earth materials supply — Arnold Magnetic Technologies (2025-09-23)
- RECOMA samarium cobalt magnets — grades and maximum operating temperatures — Arnold Magnetic Technologies (accessed 2026-09-18)
- Arnold Magnetic Technologies announces new USA Rare Earth agreement — non-exclusive mutual distribution — Arnold Magnetic Technologies via Business Wire (2026-03-23)
- Acquisitions history — 1895 lineage, 1976 rare earth production start, 2005 renaming — Arnold Magnetic Technologies (2021-11)
How this page is sourced
Everything here comes from public sources — company filings, annual reports, exchange announcements, government releases and trade press. Every figure is linked to the document it came from and carries the date that document was published, because a capacity number without a date is not a fact, it is a rumor with a decimal point.
What is deliberately absent: material nonpublic information. I have spent more than two decades in this industry and a good deal of what I know about these companies I learned under NDA. Those obligations do not expire and they do not bend for a website. Nothing I have been told in confidence appears here in any form, and nothing on this page — or missing from it — should be read as a signal about what I know privately. I hold NDAs absolutely. It is the reason clients tell me things.
Judgment is the other thing left out on purpose. This page reports what has been published and who published it. Whether a target is credible, whether a ramp will hold, whether a capacity figure survives contact with the plant behind it — that is the work I do for clients, and it does not belong in a free reference page.
Where public sources disagree, I say so rather than picking a winner. Where a figure has not been published, the field says so rather than carrying an estimate. An empty field is information too.
Public filings tell you what a company has said. Whether it holds up is a different question, and the one I get hired to answer.
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