Magrathea
Magrathea Metals - Building American Magnesium Supply Security
San Francisco, United States · $34.0M raised
- Headquarters
- San Francisco, California
- Business Model
- B2B
- Website
- magratheametals.com
- Total Funding
- $34.0M
- Last Round
- $24.0M Series AMay 2026
- Rounds
- 2
About
Magrathea is a technology company founded in California that has developed a new generation of electrolytic process for making clean, secure magnesium metal from seawater and brines. Magnesium supply underpins trillions of dollars of trade, and national security is impossible without it; Magrathea is the category leader in rebuilding ex-China supply of the critical material.
Summary
Magrathea is a Climate Tech company based in San Francisco, United States. It has raised $34.0M in total across 2 rounds, most recently a $24.0M Series A round in May 2026. Investors include Resource Technology Capital, Volo Earth Ventures and Capricorn Investment Group.
Tech & App Stack
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Funding History
May 2026
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Seed through Series A — per-round amounts, valuations, and who invested in each round.
Investors
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