Jacob Brown
Chief Scientist
Open roles0
Total raised$24M
Team size11-50
Founded · Stage2022 · Series A
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About the company
What they build and who they serve.
Magrathea Metals develops a carbon-neutral electrolytic process to extract magnesium metal from seawater and waste brines, targeting industrial customers in defense, automotive, and aerospace. The San Francisco-based company operates a pilot facility in Oakland, California and is building the first new U.S. magnesium smelter to reduce reliance on Chinese supply. Founded by CEO Alex Grant, it has signed a joint-venture term sheet with TETRA Technologies and an offtake distribution partnership with Wogen.
Team & contacts
Key people at the company—reach out on LinkedIn or email.
Alex Grant
CEO
Keegan Cisowski
Operations Manager
Darren Cockrell
Refractory Engineer
Tuan Nguyen
Senior Research Scientist
John Hermens
Senior Process Engineer
Why it matters
Signals from funding, traction, and product direction.
- Series A co-led by Resource Technology Capital and Balerion Space Ventures, with new participation from Oxcart, WovenEarth, Audacity and Avila and follow-on from insiders VoLo Earth, Capricorn Investment Group and Ora Global.
- Proceeds will fund construction of a demo magnesium smelter — Magrathea already operates a pilot facility in Oakland, California and is working toward Stamps, Arkansas as the next site under a JV term sheet with TETRA Technologies.
- Strategic context: there is currently zero primary magnesium production across NATO; defense and automotive manufacturers are actively seeking suppliers outside China, where the bulk of global magnesium production sits.
- Magrathea has signed an offtake distribution agreement with trading house Wogen targeting up to 7,000 tonnes/year of magnesium into the market by 2029.
Funding history
Rounds and investors over time, newest first.
Series A
$24MCapricorn Investment GroupVoLo Earth VenturesBalerion Space Ventures · LeadOra GlobalAvila VCWovenEarth VenturesAudacity VCOXCART VenturesResource Technology Capital · Lead
In the news
Press, announcements, and coverage about this company.
Investors
Capricorn Investment GroupVoLo Earth VenturesBalerion Space VenturesOra GlobalAvila VCWovenEarth VenturesAudacity VCOXCART VenturesResource Technology Capital
Focus areas
Series ACleantechDefenseMining & Metals
No open roles on the board yet
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