# Magrathea

> Magrathea is an Oakland, California clean-tech company rebuilding American magnesium production. Using a next-generation electrolytic process, it makes magnesium metal from seawater and brines with near-zero carbon emissions, aiming to break the West's dependence on Chinese supply for a metal critical to aerospace, automotive, and defense.

- **Founded:** 2022
- **Headquarters:** Oakland, California, United States
- **Founders:** Alex Grant (CEO & Co-founder), Jacob Brown (Co-founder (Technical))
- **Team size:** ~20 employees
- **Products:** Magnesium metal, Magnesium chloride electrolyzer
- **Notable:** Produced its first magnesium ingot in 2022, Launched a next-generation magnesium chloride electrolyzer at its Oakland pilot facility (May 2025), Pilot plant capacity of ~4,000 lbs of magnesium per year

## Products & services

- **Magnesium metal** — Primary magnesium metal (ingots) produced from seawater and brines for aerospace, automotive, and defense manufacturing.
- **Magnesium chloride electrolyzer** — Next-generation electrolytic technology that splits magnesium salts using electricity to produce magnesium metal at lower cost and near-zero carbon emissions.

## Achievements

- Produced its first magnesium ingot in 2022
- Launched a next-generation magnesium chloride electrolyzer at its Oakland pilot facility (May 2025)
- Pilot plant capacity of ~4,000 lbs of magnesium per year
- Claimed carbon-neutral process (0 kg CO2e/kg vs. 40+ kg CO2e/kg for the conventional Chinese process)
- Raised $24M Series A; over $100M total backing across private, government, and commercial channels
- Secured over $500M/year in future metal sales under MOU

## Latest updates

- **2026-05** — Closed a $24M Series A co-led by Resource Technology Capital and Balerion Space Ventures, bringing total backing past $100M.
- **2025-05** — Launched next-generation magnesium chloride electrolyzer at its Oakland pilot facility and detailed plans to scale.
- **2025-12** — Featured among start-ups advancing US magnesium production (C&EN).

## Links

- Website: https://magratheametals.com
- LinkedIn: https://www.linkedin.com/company/magratheametals
- Twitter/X: https://twitter.com/magratheametals

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Profile page: https://yespress.io/magrathea
Published by YesPress — https://yespress.io
Last updated: 2026-06-08