Mantle8

Private

GrenobleEnergy & Sustainabilityhttps://mantle8.com/

Last Round

Series A

May 13, 2026

Total Funding Raised

$41.9M

Momentum

Top 5%

of companies Caplight tracks

Company Overview

Mantle8 is an energy exploration company that develops proprietary geoscience and imaging technologies to identify and assess natural hydrogen reservoirs.

Sector

Energy & Sustainability

Verticals

Alternative Fuels, Renewable Energy, Environmental Monitoring

Business Model

B2B

Customer Profile

Services & Consulting, Data as a Service

AI Layer

Application

Keywords

natural hydrogenwhite hydrogengeoscience softwaresubsurface imagingpredictive modelinghydrogen explorationmultiphysics imagingenergy explorationgeophysical analysissubsurface modelinggeological dataclean energy techexploration servicesgeotechdeep tech

Historical Pricing

Historical view of private secondary pricing and transaction trends.

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Caplight Momentum Score

Proprietary index based on bid/ask volume and sentiment.

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Mantle8 Comps

Public and private peers based on sector, stage, and business model.

Mantle8 comps — public and private peers by sector, stage, and business model
Company	Status	Est. Valuation	Rev Multiple
OpenAI	Private	$86.0B	~40x
Cohere	Private	$5.0B	--
Competitor 1	Public	$XX.XB	XXx
Competitor 2	Public	$XX.XB	XXx

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Mantle8 Funding Rounds

Historical fundraising activity

Data table
Round	Date	Amount Raised	Valuation	Investors	Sources
Series A	May 13, 2026
Grant	Mar 10, 2026
Seed	Feb 7, 2025

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Key People

Founding team and executive leadership

Emmanuel Masini

CEO

Executive Team

Mantle8 Investors

Notable investors and investment history

Mantle8 investors
Investor	Rounds
IP Group	Series A
European Commission	Grant
Sandwater	Series A
Breakthrough Energy Ventures	Seed, Series A
Wind Capital	Series A
Bpifrance	Series A
Kiko Ventures	Series A, Seed

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Market signals

Structured signals derived from secondary market and firmographic data.

May 22, 2026
Grew 24% quarter-over-quarter, from 21 to 26 employees.
May 13, 2026
$36M round led by Sandwater.

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Mantle8 Filings

SEC and related filings with document metadata.

Data table
Typed	Date	Amount Offered	Amount Sold	Filling	Pages	Download
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Mantle8 Filings

SEC and related filings with document metadata.

Frequently Asked Questions

Common questions about Mantle8's valuation, stock price, and market status.

Firmographic Details

HeadquartersGrenoble

Employee Range31

Year Founded2018

Last FundingMay 13, 2026

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