Mantle8
The first geology-based natural hydrogen exploration company.
Grenoble, France · Founded 2024 · $39.4M raised
- Headquarters
- Grenoble
- Employees
- 11–50
- Founded
- 2024
- Business Model
- B2B
- Website
- mantle8.com
- Total Funding
- $39.4M
- Last Round
- $36.0M Series AMay 2026
- Rounds
- 2
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 2 funding rounds and 2 investors for this company. The full record is or through the API.
About
Mantle8 is a French natural hydrogen exploration company combining geophysics, geochemistry, and seismic data to accurately detect natural hydrogen locations. Its proprietary technology visualizes entire hydrogen-generating systems to evaluate the amount and quality of hydrogen present, enabling identification of optimal reservoirs and targeting production at $0.80/kg. Founded in 2024 by geologists with 20 years of experience, Mantle8's geology-based approach halves project development time compared to trial-and-error drilling, and is scalable across the entire planet.
Summary
Mantle8 is a Climate Tech company based in Grenoble, France, founded in 2024. It has raised $39.4M in total across 2 rounds, most recently a $36.0M Series A round in May 2026. Investors include Kiko Ventures and Breakthrough Energy Ventures.
Tech & App Stack
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Funding History
May 2026
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Funding: Seed through Series A. Amounts, valuations, and investors where available.
Investors
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