# Magrathea: Mining & metals, Oakland, United States

> Magrathea: Magrathea is a cleantech and frontier industrial technology company founded in 2022 in California. Based in Oakland, United States. Founded 2022.

Source: https://millionrounds.com/startup/magrathea-3 (Millionrounds; every figure on the page links to its filing or article)

United States · [Mining & metals startup](https://millionrounds.com/companies)

# Magrathea

Magrathea is a cleantech and frontier industrial technology company founded in 2022 in California.

Email

Funding reported Last round: Seed

Mining & metals Oakland, United States

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Company summary

- **Founded:** 2022 4 years old
- **Team:** 22 11 to 50 people
- **Funding reported:** $24M in dollars
- **Last round:** Seed Jun 2023

How sure we are

- ✓ **Listed** We know it exists and what it does
- 2 **Funding reported** A company dataset reports a raise
- 3 **Observed** A filing or a dated announcement confirms a round

No round for Magrathea has been confirmed by a filing or an announcement yet, so nothing here counts toward an investor's record. [How we decide](https://millionrounds.com/methodology)

## About Magrathea

Magrathea is a cleantech and frontier industrial technology company founded in 2022 in California.

Established by chemical engineers Alex Grant and Jacob Brown, the company focuses on creating a low-carbon alternative to traditional metal extraction. Magrathea specializes in producing carbon-neutral magnesium metal and other light metals directly from seawater and brines through an advanced electrolytic process. This innovative approach aims to reduce the environmental impact of industries such as automotive, defense, and manufacturing. The company operates a pilot facility in Oakland, California, where it has successfully demonstrated its technology. Magrathea has secured over $100 million in funding from private investors and government partnerships, including a significant collaboration with the U.S. Department of Defense. Its product offerings include high-purity magnesium, rare earth materials, and electrolyzer machinery, all designed to support sustainable infrastructure and the electrification of various sectors. Magrathea is committed to enhancing supply chain resilience and promoting environmental sustainability through its mining-free metal production methods.

## What company datasets say Magrathea raised

Funding, as reported

Reported in all **$24M** in dollars

Rounds **2**

Last round **Seed**

Last round size **$24M**

Last round date **Jun 2023**

Investors listed **21**

## Founders and team

From Magrathea's own website: 2 on the team.

- **Alex Grant** CEO
- **Jason Rosalli** CTO

## On 8 portfolio pages

Investors who name them

- [Volo Earth Ventures](https://millionrounds.com/fund/volo-earth-ventures)
- [Compound](https://millionrounds.com/fund/compound-4)
- [TGM ventures](https://millionrounds.com/fund/tgm)
- [Juniper](https://millionrounds.com/fund/juniper)
- [Berkeley Gateway Accelerator](https://millionrounds.com/fund/berkeley-gateway-accelerator)
- [Avila VC](https://millionrounds.com/fund/avila-vc)
- [HyperGuap](https://millionrounds.com/fund/hyperguap)
- [Unbundled VC](https://millionrounds.com/fund/unbundled-vc)

Each firm lists Magrathea on its own website. That is the firm's claim, a weaker thing than a round we watched, but a named source.

## The company, in detail

What they build

Known for

magnesium foundry electrolysis aluminum primary metal manufacturing brine b2b light metal mining & metals hydrometallurgy metallurgy

Built with from their website

Amazon CloudFront Squarespace ECommerce Clarity SDM MailChimp CloudFlare Viewport Meta Webflow Hosting CloudFlare CDN CAPTCHA Google Font API

+8 more

Microsoft Exchange Unpkg Microsoft 365 Apps & Services Mobile Friendly Greenhouse Open Graph jQuery Squarespace

- **Sector:** Mining & metals
- **Industry code:** NAICS 331
- **Region:** California
- **Revenue:** $1.4M a year, as listed
- **Full record:** [Every detail in the company directory](https://millionrounds.com/directory/magrathea)

## Mining & metals in United States

Startups like it

- [**Redwood Materials** Carson City · founded 2017 *Raised*](https://millionrounds.com/company/redwood-materials)
- [**KoBold Metals** Berkeley · founded 2018 *Raised*](https://millionrounds.com/company/kobold-metals)
- [**Reframe Systems** Andover · founded 2021 *Raised*](https://millionrounds.com/company/reframe-systems)
- [**Mariana Minerals** San Francisco · founded 2009](https://millionrounds.com/startup/mariana-minerals)
- [**Lilac** Oakland · founded 2016](https://millionrounds.com/startup/lilac-4)
- [**JENNMAR** Pittsburgh · founded 1972](https://millionrounds.com/startup/jennmar)
- [**Seurat Technologies** Wilmington · founded 2015](https://millionrounds.com/startup/seurat-technologies)
- [**Jetti Resources** Boulder · founded 2014](https://millionrounds.com/startup/jetti-resources)

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