Magrathea Metals
Magrathea Metals is an Advanced Metals & Metallurgy company founded in 2022 and based in Oakland, United States. It has raised $100M in total funding, most recently a Series A in 2026.
Founded in 2022 by Alex Grant and Jacob Brown, both chemical engineers with battery and lithium backgrounds, Magrathea Metals is based in Oakland, California. The company has developed a new electrolytic process that produces magnesium metal from seawater and brine at lower cost than incumbent mining-based routes and with a carbon-neutral footprint. Magnesium is a lightweight structural metal critical to automotive, aerospace and defense applications, and Magrathea closed a $24 million Series A in 2026 (co-led by VoLo Earth and Capricorn Investment Group across earlier rounds), bringing total backing from private, government and commercial partners to over $100 million.
The U.S. has almost no domestic primary magnesium; Magrathea's seawater electrolysis aims to onshore a defense-critical light metal China currently dominates.
magratheametals.com ↗·Advanced Metals & Metallurgy·
United States·private 
