Mantle8

Private

Grenoble-based French natural-hydrogen explorer using proprietary 4D subsurface modeling (HOREX) to identify commercially viable geologic H2 deposits. Targeting production cost below €0.80/kg. Founded by ex-TotalEnergies geoscientist Emmanuel Masini.

Founders Emmanuel Masini

CEO Emmanuel Masini

Company

Founded

2019

Headquarters

Grenoble, France

Financials

Total Funding

$38M

Sectors

Climate Tech Hardware

mantle8.com

Funding History

3 rounds

Series A May 13, 2026

$33M

Sandwater (Lead) Breakthrough Energy Ventures Bpifrance IP Group Wind Capital Calderion

Grant Mar 15, 2026

$2M

European Union Just Transition Fund (Lead)

Seed Jun 15, 2025

$3M

Breakthrough Energy Ventures (Lead)

Funding data is compiled from multiple independent sources including company announcements, press coverage, and regulatory filings. While we strive for accuracy, amounts and dates may reflect reported figures at time of announcement.