# Heirloom Carbon Technologies

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/heirloom-carbon-technologies

- Industry: Environmental Services
- Headquarters: Brisbane, US
- Website: www.heirloomcarbon.com
- Total disclosed funding: $203M
- Latest round: Series B (Dec 4, 2024)
- Investors on record: 20

## About

Founded in 2020 in Brisbane, US, Heirloom Carbon Technologies specializes in carbon dioxide removal via Direct Air Capture. The company has undergone strategic developments to scale its operations. In December 2025, Heirloom Carbon Technologies, Inc. raised an undisclosed amount of venture funding from Development Bank of Japan.

Heirloom specializes in Direct Air Capture (DAC) technology, utilizing limestone for carbon mineralization to permanently remove CO2 from the atmosphere. The company operates facilities that capture significant volumes of CO2, with plans for two new facilities in Northwestern Louisiana capable of capturing nearly 320,000 tons of CO2 annually. Heirloom's technology accelerates the natural mineralization process, targeting businesses committed to sustainability who purchase carbon removal credits to offset their emissions. The company primarily focuses on the North American market, especially the United States, as it scales operations aligned with regional net-zero goals.

Heirloom specializes in Direct Air Capture (DAC) technology, utilizing limestone for carbon mineralization to permanently remove CO2 from the atmosphere. The company operates facilities that capture significant volumes of CO2, with plans for two new facilities in Northwestern Louisiana capable of capturing nearly 320,000 tons of CO2 annually. Heirloom's technology accelerates the natural mineralization process, targeting businesses committed to sustainability who purchase carbon removal credits to offset their emissions. The company primarily focuses on the North American market, especially the United States, as it scales operations aligned with regional net-zero goals.

As of December 2025, the company plans to expand direct air capture plant construction, reduce carbon dioxide removal costs, broaden utilization partnerships, and increase carbon credit generation capacity.

## Funding rounds

- Series B, Dec 4, 2024, $150M — Quantum Capital Group, MC Capital, Japan Airlines, Siemens Financial Services, Mitsui & Co., Breakthrough Energy Ventures, H&M Group Ventures, Ahren Innovation Capital, Lowercarbon Capital, Future Positive, Carbon Direct Capital, MCJ, MOL Switch
- Series A, Mar 17, 2022, $53M — Breyer Capital, Breakthrough Energy Ventures, Ahren Innovation Capital, Lowercarbon Capital, 776, Carbon Direct Capital, Time Ventures, Microsoft Climate Innovation Fund, Carbon Removal Partners, Neglected Climate Opportunities
- Seed, Apr 1, 2021 — Prelude Ventures, Breakthrough Energy Ventures, Lowercarbon Capital

## Investors

- Prelude Ventures — Seed
- Breakthrough Energy Ventures (https://capitalatlas.ai/funds/breakthrough-energy-ventures) — Seed, Series A, Series B
- Lowercarbon Capital (https://capitalatlas.ai/funds/lowercarbon-capital) — Seed, Series A, Series B
- Breyer Capital (https://capitalatlas.ai/funds/breyer-capital) — Series A
- Ahren Innovation Capital (https://capitalatlas.ai/funds/ahren-innovation-capital) — Series A, Series B
- 776 (https://capitalatlas.ai/funds/776) — Series A
- Carbon Direct Capital (https://capitalatlas.ai/funds/carbon-direct-capital) — Series A, Series B
- Time Ventures (https://capitalatlas.ai/funds/time-ventures) — Series A
- Microsoft Climate Innovation Fund (https://capitalatlas.ai/funds/microsoft-climate-innovation-fund) — Series A
- Carbon Removal Partners (https://capitalatlas.ai/funds/carbon-removal-partners) — Series A
- Neglected Climate Opportunities (https://capitalatlas.ai/funds/neglected-climate-opportunities) — Series A
- Quantum Capital Group (https://capitalatlas.ai/funds/quantum-capital-group) — Series B
- MC Capital — Series B
- Japan Airlines — Series B
- Siemens Financial Services — Series B
- Mitsui & Co. — Series B
- H&M Group Ventures — Series B
- Future Positive (https://capitalatlas.ai/funds/future-positive) — Series B
- MCJ (https://capitalatlas.ai/funds/mcj) — Series B
- MOL Switch (https://capitalatlas.ai/funds/mol-switch) — Series B