Magrathea electrolytic magnesium process
Electrolytic process that makes magnesium metal from seawater and brine-derived magnesium chloride.
Prototype
Startup · United States
Magrathea Metals
HQ OaklandFounded 202211-50 employees
Founded in 2022 and headquartered in San Francisco, California, Magrathea Metals is pioneering a revolutionary electrolytic process to produce carbon-neutral magnesium metal from seawater and brines. This innovative approach not only addresses critical supply chain vulnerabilities—especially given that NATO currently has zero magnesium production—but also supports global electrification and decarbonization efforts. With substantial backing, including a $28 million partnership with the U.S. Department of Defense, Magrathea is poised to transform industries reliant on lightweight metals, such as automotive and aerospace, by providing a sustainable and domestically sourced alternative to traditional magnesium production.
StartupPrototype
May 5, 2026Company (high significance)Magrathea backed by $100M to rebuild American magnesium productionMagratheaDec 2, 2025News (high significance)Tetra considers Arkansas magnesium project with Pentagon-backed MagratheaReutersMay 28, 2025CompanyMagrathea launches next-gen magnesium production technology, advances plans to scaleMagrathea
- May 5, 2026Company (high significance)MagratheaMagrathea backed by $100M to rebuild American magnesium production
- Dec 2, 2025News (high significance)ReutersTetra considers Arkansas magnesium project with Pentagon-backed Magrathea
- May 28, 2025CompanyMagratheaMagrathea launches next-gen magnesium production technology, advances plans to scale
Funding3 rounds · $36.0M
- Equity raised
- $36.0M
- Latest
- $24.0MSeries A · May 5, 2026
Mar 2, 2022May 5, 2026
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| May 5, 2026 | Series A | $24.0M | — | Balerion Space, Resource Technology Capital | Capricorn Investment Group, VoLo Earth Ventures | Confirmed |
| Jun 7, 2023 | Seed | $10.0M | — | Capricorn Investment Group, VoLo Earth Ventures | Exor Ventures, Necessary Ventures, Sam Altman, Valor Equity Partners | Confirmed |
| Mar 2, 2022 | Convertible | $2.0M | — | — | — | Confirmed |
- $24.0MMay 5, 2026
- $10.0MJun 7, 2023
- ConvertibleConfirmed$2.0MMar 2, 2022
Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.
Systems1
Newest unveiled first. Open a system for its milestone timeline, components and sources.
Supply Chain1 input · 2 facilities
Produces, processes or develops1
Facilities2
| Facility | Kind | Location | Status | Confidence |
|---|---|---|---|---|
| Arkansas Magnesium Commercial Phase 1 plant | Factory | AR, United States | Planned | Confirmed |
| Magrathea Light Metal Technology Center (Oakland pilot facility) | Lab | Oakland, CA, United States | Operating | Confirmed |
- Arkansas Magnesium Commercial Phase 1 plantFactory · AR, United StatesPlannedConfirmed
- Magrathea Light Metal Technology Center (Oakland pilot facility)Lab · Oakland, CA, United StatesOperatingConfirmed
People3
Hiring Observations2 observed listings
Demonstration Plant Superintendent ↗
Salt Lake City Area, Utah · Other
Open when checked · Greenhouse public employer job board
Checked Oct 13, 2026
Oakland, California · Other
Open when checked · Greenhouse public employer job board
Checked Oct 13, 2026
A sample of observed listings, not a total vacancy count. Availability may have changed since collection. Categories are inferred from job titles.
Company Metrics
Employee-profile counts reflect LinkedIn profiles associated with the company, not verified headcount. One observation establishes a baseline; it does not establish growth.
Sources11
Show all 11 sources and supporting evidence
Profile1
- 1
TETRA Technologies · Dec 2, 2025 · Supports Organization · legal name
“to form a joint venture with Magrathea Metals, Inc. (a private company developing innovative technology for producing clean, secure magnesium metal from seawater and brines)”
Systems2
- 2
Magrathea · May 28, 2025 · Supports Facility, System
“at its pilot facility in Oakland, California”
- 3
Magrathea · Supports Facility, System, System · maturity
“validated at pilot scale at our Light Metal Technology Center in California”
Funding3
- 4
Magrathea · May 5, 2026 · Supports Facility, Funding round
“engineering work is underway on the Arkansas Magnesium's Commercial Phase 1 plant”
- 5
Magrathea · Jun 7, 2023 · Supports Funding round, Funding round · amount
“The round was co-led by VoLo Earth and Capricorn Investment Group.”
- 6Regulatory filingMagrathea Metals Inc. - SEC Form D/A (0001918019-22-000002)
U.S. Securities and Exchange Commission · Apr 14, 2022 · Supports Funding round · amount
“Total Amount Sold $ 1,955,000 USD”
Supply chain2
- 7
Magrathea Metals · Supports Organization · name, Organization input
“Magrathea Metals | U.S. Magnesium Production & Supply Chain”
- 8
LinkedIn · Supports Facility, Organization · employee range, Organization metric · employees in linkedin, Organization metric · followers
“headquarters: Oakland, California”
People2
- 9OtherBlack Flag 100
Black Flag · Supports Organization, Role
“Founded in 2022 and headquartered in San Francisco, California, Magrathea Metals is pioneering a revolutionary electrolytic process to produce carbon-neutral”
- 10
Magrathea · Supports Role
“Jason Rosalli CTO Scaled a novel chemical process”
Other1
- 11
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