Magrathea Metals
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Investors
About
Magrathea Metals is a California-based startup founded in 2022 by Alex Grant (CEO) and Jacob Brown, both chemical engineers with prior experience working on lithium and battery technology, including time at Tesla 1. The company is developing a novel electrolytic process to produce magnesium metal from seawater and underground brines, with the goal of rebuilding US-domestic and ex-China magnesium production capacity for industrial and defense applications 12.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2023-06-07 | Seed | $10M | VoLo Earth, Capricorn Investment Group | Valor Equity Partners, Exor Ventures, Hyperguap, Necessary Ventures, Untitled, EQT Foundation 13 |
| 2026-05-05 | Series A | $24M | Resource Technology Capital, Balerion Space Ventures | VoLo Earth, Capricorn Investment Group, Ora Global, Oxcart, WovenEarth, Audacity, Avila 2 |
What Investors Say
No independently sourced investor quotes found.
What Founders Say
Alex Grant, CEO and co-founder of Magrathea, on the Series A: “Magnesium metal supply underpins trillions of dollars of trade and national security is impossible without it. Magrathea is the global category leader in rebuilding ex-China magnesium supply.” 2
Sources
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Gunderson Dettmer, “Gunderson Dettmer Advises Magrathea Metals in its $10M Seed Financing co-led by VoLo Earth and Capricorn Investment Group,” accessed April 2026. https://www.gunder.com/en/news-insights/client-news/magrathea-metals-announces-10m-seed-financing↩↩↩
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Magrathea Metals, “Magrathea backed by $100M to rebuild American magnesium production,” May 5, 2026, accessed April 2026. https://www.magratheametals.com/news/100million↩↩↩
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Magrathea Metals, “Magrathea raises $10M seed round,” June 7, 2023, accessed April 2026. https://www.magratheametals.com/news/seedround↩