2026-05-13
Mantle8 raises €31M Series A
Grenoble-based Mantle8 raised €31M in a Series A led by Sandwater.
Round at a Glance
| Company | Mantle8 |
| HQ | Grenoble, France |
| Amount | €31M ($37M) |
| Round | Series A |
| Date | 2026-05-13 |
| Valuation | Not disclosed |
| Total Disclosed Funding | €37M |
Company Snapshot
Mantle8 is a France-based natural hydrogen exploration company. According to the company's public materials, the product helps the company's own exploration and drilling campaign with proprietary subsurface modelling and multiphysics technology, including a platform that generates four-dimensional images of active underground hydrogen systems.
Investors in This Round
| Investor | Investor HQ Country | Notes |
|---|---|---|
| Sandwater | Norway | Lead |
| Breakthrough Energy Ventures | United States | Participant |
| Bpifrance | France | Participant |
| IP Group | United Kingdom | Participant |
| Wind Capital | Not disclosed | Participant |
| Calderion | Not disclosed | Participant |
Known Cap Table
| Investor | Round(s) | Investor HQ Country |
|---|---|---|
| Sandwater | Series A | Norway |
| Breakthrough Energy Ventures | Series A | United States |
| Bpifrance | Series A | France |
| IP Group | Series A | United Kingdom |
Total disclosed funding: €37M.
Sources
- https://mantle8.com/mantle8-raises-e31m-in-series-a-funding-to-prove-commercial-viability-of-natural-hydrogen-production
- https://www.eu-startups.com/2026/05/frances-mantle8-raises-e31-million-to-fund-the-worlds-most-advanced-natural-hydrogen-exploration-and-drilling-campaign/
- https://www.theengineer.co.uk/content/news/france-s-mantle8-raises-31m-for-hydrogen-exploration