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MANTEL CAPTURE, INC.

Cambridge, MA · Founded 2022 · Clean tech · Private

Molten borate salt system for carbon dioxide capture from industrial emission sources

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Updated · mantelcapture.com

Sector
Clean tech
Headquarters
Cambridge, MA
Founded
2022
Latest Form D
$18.3M, Aug 2026
Total capital
$51M
Federal grants
$275K
1 award · 2024
Rank in peer group#7 of 28
Private capital raised
$50.5M
4 Form D · last Aug 2026
2 months since last filing
Federal contracts
$246K
1 award · Defense
Rank in Clean tech#83 of 914
Granted patents
0
7 pending

Capital timeline

20222023202420252026FEDERAL ↑EQUITY ↓Cumulative $51M$246K$275K1st Form D$2M2nd Form D$700K3rd Form D$29.4M4th Form D$18.3M
20222023202420252026FEDERAL ↑EQUITY ↓Cumulative $51M$246K$275K1st Form D$2M3rd Form D$29.4M

Latest events

  • Private capital raisedForm D · SEC · 4th filing$18.3M
  • Private capital raisedForm D · SEC · 3rd filing$29.4M
  • Federal grantNSF · Phase I · SBIR Phase I: Optimizing Composition of Novel Molten Alkali Metal Borates for Carbon Dioxide Capture$275K
  • Private capital raisedForm D · SEC · 2nd filing$700K
  • Federal contractDefense · Mantel Capture, Inc. - SBIR Phase I$246K
  • Private capital raisedForm D · SEC · 1st filing$2M

Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.

Standing among 28 peers

Line = median

Clean tech · Material

  • Federal grants#7 · top 25%

Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.

Founders and team

Researcher links verified by same-company patents and grants
  • Sean RobertsonResearcherDirectorLinked by $275K in grants as PI
  • Cameron HallidayExecutive Officer, DirectorNamed in SEC Form D filings
  • Danielle ColsonDirectorNamed in SEC Form D filings
  • Daniel LeffDirectorNamed in SEC Form D filings
  • Danielle RapsonExecutive Officer, DirectorNamed in SEC Form D filings
  • Hector MacQuarrieDirectorNamed in SEC Form D filings
Show all 8 people
  • Hooisweng OwDirectorNamed in SEC Form D filings
  • Michael KearneyDirectorNamed in SEC Form D filings

What it has protected

USPTO · 0 granted of 7
  • PendingSystems And Methods For CO2 Capture Using Molten SaltsUSPTOApplication 19211956
  • PendingSystems And Methods For Heat RecoveryUSPTOApplication PCTUS2024039436
  • PendingMethods For Heat RecoveryUSPTOApplication 63652899
Show all 7 patent records
  • Systems And Methods For CO2 Capture Using Molten SaltsApr 2, 2026 · Application 19211956Pending
  • Systems And Methods For Heat RecoveryApplication PCTUS2024039436Pending
  • Methods For Heat RecoveryApplication 63652899Pending
  • Methods Of Control For CO2 Capture Systems Using Molten SaltsApplication PCTUS2024024157Pending
  • Systems And Methods For Co 2 Capture Using Molten SaltsApplication PCTUS2023080613Pending
  • Methods For Heat RecoveryApplication 63515561Pending
  • Methods And Systems For CO2 CaptureApplication 63495760Pending

Related companies, and why

  • RedShift Energy, Inc.Similar federal contract value in Clean tech · $250K in contracts
  • NX FUELS INCSimilar federal contract value in Clean tech · $250K in contracts
  • MIGHTY SEAWALL INC.Similar federal contract value in Clean tech · $250K in contracts
  • 3D ARRAY TECHNOLOGY LLCSimilar federal contract value in Clean tech · $225K in contracts
  • UPSTREAM PBCSimilar federal contract value in Clean tech · $219K in contracts
  • 2WITECH SOLUTIONS LLCSimilar federal contract value in Clean tech · $210K in contracts

Regulatory activity · Clean tech

Sector-level, not company-level

Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.

Sources

Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.

How to read this page

Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.

Data freshness

SEC Form D filings through . SBIR and STTR awards through .