Mantle8
Summary active Updated May 13, 2026This profile is AI-generated. If you spot an error, please help us fix it by sharing a URL to the correct information.
About
Mantle8 is a Grenoble, France-based deep-tech startup pioneering natural (geologic) hydrogen exploration and drilling, with a proprietary technology platform for identifying commercial-scale hydrogen systems 12. The €31M Series A announced May 13, 2026 was led by Sandwater with participation from Breakthrough Energy Ventures, Ecotechnologies 2 fund (managed by Bpifrance on behalf of the French government), IP Group, Wind Capital, and Calderion (an Audacia-backed investment platform); the round brings total funding to €37M ($44M) 12. Capital will fund the world’s most advanced natural hydrogen exploration and drilling campaign over the next two years 1.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-05-13 | Series A | €31M | Sandwater | Breakthrough Energy Ventures, Ecotechnologies 2, IP Group, Wind Capital, Calderion 12 |
| 2025-02 | Seed | €3.4M | — | — 3 |
What Investors Say
No independently sourced investor quotes found at this time.
What Founders Say
Bart Markus, Chairperson, stated: “The next two years are about proving that the active hydrogen systems our technology has pinpointed can deliver sustained, commercially viable flow.” 1
Sources
-
AzoCleanTech, “Mantle8 Raises €31M in Series A Funding to Prove Commercial Viability of Natural Hydrogen Production,” May 13, 2026. Accessed May 2026. https://www.azocleantech.com/news.aspx?newsID=36328↩↩↩↩↩
-
ESG Today, “Mantle8 Raises $36 Million to Scale Natural Hydrogen Exploration Platform,” May 13, 2026. Accessed May 2026. https://www.esgtoday.com/mantle8-raises-36-million-to-scale-natural-hydrogen-exploration-platform/↩↩↩
-
EU-Startups, “Natural hydrogen exploration startup Mantle8 raises €3.4 million to scale,” February 2025. Accessed May 2026. https://www.eu-startups.com/2025/02/natural-hydrogen-exploration-startup-mantle8-raises-e3-4-million-to-scale/↩