# Mantel Capture

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/mantel-capture

- Industry: Materials
- Headquarters: Cambridge, US
- Website: www.mantelcapture.com
- Total disclosed funding: $50M
- Latest round: Series A (Jul 10, 2026)
- Investors on record: 11

## About

Founded in 2022, and based in Massachusetts, US, Mantel Capture, Inc. operates as a clean technology company that develops a carbon capture solution. The company was founded by its CEO, Cameron Halliday, COO, Danielle Colson; and CTO, Sean Robertson. In August 2026, Mantel Capture, Inc. raised USD 18 million in series A funding from Azimut Alternative Capital Partners and Constellation Technology Ventures.

Mantel Capture develops a liquid-phase carbon capture technology based on molten salt that can operate in high-temperature (about 600ºC) environments like those found within boilers, kilns, and furnaces to absorb CO2 and discharge the absorbed stream of CO2 into storage for other uses. The technology enables its customers to produce high-quality heat while minimizing energy losses. The company’s targeted client base is companies in the industrial heat, cement, steel, and hydrogen industries, who can use its solutions to cut energy losses and emissions to fulfill climate goals.

The company plans to use the August 2026 funding to support commercial deployments across power generation, oil and gas, and pulp and paper, including projects in Canada, West Virginia and Quebec.

## Funding rounds

- Series A, Jul 10, 2026, $18M — Constellation Technology Ventures, Azimut Alternative Capital Partners
- Series A, Jun 20, 2024, $29M — BP Ventures, Shell Ventures, Hartree Partners LP, Engine Ventures, Eni Next, MCJ, New Climate Ventures, Vale Ventures, Newlab
- Seed, Aug 19, 2022, $2M — Engine Ventures, New Climate Ventures

## Investors

- Engine Ventures (https://capitalatlas.ai/funds/engine-ventures) — Seed, Series A
- New Climate Ventures (https://capitalatlas.ai/funds/new-climate-ventures) — Seed, Series A
- BP Ventures (https://capitalatlas.ai/funds/bp-ventures) — Series A
- Shell Ventures (https://capitalatlas.ai/funds/shell-ventures) — Series A
- Hartree Partners LP — Series A
- Eni Next (https://capitalatlas.ai/funds/eni-next) — Series A
- MCJ (https://capitalatlas.ai/funds/mcj) — Series A
- Vale Ventures (https://capitalatlas.ai/funds/vale-ventures) — Series A
- Newlab — Series A
- Constellation Technology Ventures (https://capitalatlas.ai/funds/constellation-technology-ventures) — Series A
- Azimut Alternative Capital Partners (https://capitalatlas.ai/funds/azimut-alternative-capital-partners) — Series A