Magrathea Metals
Rebuilding the American magnesium metal supply base.
The product
Magrathea has developed a next-generation electrolytic process that produces magnesium metal directly from seawater and brines — bypassing the dirty, Chinese-dominated Pidgeon process. Standing up the first major Western electrolytic magnesium smelter in Stamps, Arkansas.
The thesis
The United States and Europe produce no primary magnesium metal, while China controls roughly 95% of global supply. Magnesium is critical for aerospace alloys, automotive lightweighting, steelmaking, titanium production, and defense platforms. Magrathea is developing a proprietary electrolytic process to restore domestic supply; the company reports more than $100 million of total backing and approximately $800 million per year of future-revenue demand for its metal.
How it runs
Develops and scales a proprietary electrolytic process for producing primary magnesium from seawater and brines. Its Arkansas Magnesium joint venture with TETRA combines Magrathea's process with TETRA's brine resource, energy, land, supply chain, and operating capabilities at the Evergreen chemical campus.
How it earns
Plans to sell primary magnesium into industrial and defense supply chains, including through an offtake and distribution partnership with global metals trader Wogen. Commercial plants are being advanced through partnerships and joint ventures, supported by government funding and private capital.
Why it wins
The process targets the difficult salt-dehydration and electrolysis steps in magnesium production. Magrathea reports 50% lower capital and operating costs than legacy electrolysis and has demonstrated greater than 99.9% pure, ASTM B92-compliant magnesium from Arkansas brine.
Evidence ledger
- website · 2026-05-28
Magrathea Metals identifies as a reindustrialization company.
https://www.magratheametals.com - web · 2026-05-05
Magrathea closed a $24 million Series A in March 2026. The company reports more than $100 million in total backing from private investors, government, and commercial partnerships. Magnesium is used in aerospace, aluminum alloys, steelmaking, titanium production, and other critical-material supply chains.
https://www.magratheametals.com/news/100million - web · 2026-09-28
Magrathea says current demand for its metal totals approximately $800 million per year of future revenue. The Department of War awarded the company a $19.6 million Defense Production Act Title III grant.
https://www.magratheametals.com/partnerships - web · 2026-09-28
Magrathea says the United States and Europe produce zero magnesium metal and China controls 95% of global supply. The company describes its technology as an electrolytic process for producing magnesium from seawater and brines.
https://www.magratheametals.com/ - web · 2026-09-28
The newest material first-party release listed is the June 16, 2026 Arkansas-brine technical milestone, before the dossier cutoff.
https://www.magratheametals.com/news
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