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Mantel

Energy · Cambridge, United States · Founded 2022

Developing the first molten-salt based carbon capture technology MoreLess

Mantel is a pioneering startup specializing in advanced materials designed for high-temperature carbon capture. Operating in the carbon capture and storage (CCS) market, Mantel's core technology utilizes molten borates to capture CO2 efficiently within industrial environments such as boilers, kilns, and furnaces. This innovative approach allows for the recovery of high-quality heat during the capture process, significantly reducing energy losses by over 60%. Mantel primarily serves large-scale industrial clients looking to meet stringent climate goals and reduce their carbon footprint. The company's business model revolves around the development and deployment of its proprietary materials, generating revenue through technology licensing and long-term service agreements. Mantel's solutions are particularly attractive in light of increasing regulatory pressures and financial incentives for carbon reduction.

Keywords: carbon capture, high-temperature, molten borates, industrial settings, energy efficiency, climate goals, CCS market, technology licensing, service agreements, regulatory compliance.

Company overview

Mantel company information

The essential company record, classifications and operating signals in one place.

Status
Operational
Founded
2022
Headquarters
Cambridge, United States
Employees
51
Open positions
16
Dealroom signal
90.1
client focusb2btechnologyHardwaretechnologyDeep Techsub industryEnergy Efficiencybusiness modelManufacturingsectorSpinoutsectorSustainable Development GoalssectorCarbon Capture and StoragesectorClimate TechsectorPoint SourcesectorNIF defense security and resiliencesectorNIF Energy Security and Climate ChangesectorDT and LSsectorscience-based

Valuation & funding

Mantel funding history

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES AEquity / VC Aug 2026 $18M $150M Azimut Investments · Constellation Technology Ventures
SERIES AEquity / VC Apr 2025 Alumni Ventures
SERIES AEquity / VC Sep 2024 $30M $120M BP Ventures · Vale · MCJ Collective · Hartree Partners
SUPPORT PROGRAMOther financing Jul 2024 $0 Third Derivative
SEEDEquity / VC Aug 2022 $2M $8M New Climate Ventures · The Engine
SPINOUTOther financing Jan 2022 Massachusetts Institute of Technology
Showing 6 recorded eventsUnlock the complete deal history →

Financials

Workforce over time

Available workforce history. Financial fields without reported data are omitted.

YearEmployees
2026 49
2025 37
2024 27
2023 12
2022 4
Company filings, research estimates and Dealroom dataOpen the full financial model →

Growth signals

Mantel website traffic

Latest recorded traffic for Mantel is 5.1K monthly website visits, up 59.4% over the last three months. Mantel's team grew 37.8% over the past year.

Latest monthly visits5.1K 3-month web change+59.4% 1-year team growth+37.8%
Monthly website visits46 observations · Oct 2022–Jul 2026
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Comparisons

Mantel compared with similar companies

Dealroom’s weighted taxonomy model identifies the closest operating peers. Company identity and context stay open; selected comparison metrics preview what is available in the platform.

Showing 8 of the closest matchesCompare every metric →

Talent graph

Mantel's talent

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Team profiled 6 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 4 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

16 investors on Mantel's cap table

Sourced from Dealroom's funding and investor records. Investor profile links are shown where available.

Seed 2 investors entered at this stage
The Engine
New Climate Ventures
Series A 12 investors entered at this stage
Shell
Eni Next
BP Ventures
Vale
MCJ Collective
Hartree Partners
Engine Ventures
Newlab
Arosa Capital Management
Alumni Ventures
Azimut Investments
Constellation Technology Ventures
Other known 2 additional known investors
Massachusetts Institute of Technology
Third Derivative

Global footprint

Where Mantel has talent and traffic

Workforce by country
2 countries with
team presence
🇺🇸 United States75%
🇨🇦 Canada25%
2 countries shown

In the news

Latest news about Mantel

Recent press, funding announcements, and product moves mentioning Mantel — open to read from the original sources.

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Market sentiment

What the market is saying about Mantel

An AI-synthesized read of the highest-engagement posts about Mantel on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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