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Overview
Heirloom Carbon develops Direct Air Capture technology that uses limestone to speed up carbon mineralization, turning atmospheric CO2 into rock within days. Its main offering is carbon removal credits, representing permanent CO2 removal and storage either underground or in building materials like concrete. The approach differs by leveraging abundant limestone and targeting credits under $100 per ton by 2035, backed by a commercial facility opened in 2020. The company aims to help other businesses reach carbon neutrality with affordable, permanent removal while creating green jobs and minimizing environmental impact.
About Heirloom Carbon
Industries
Industrial & Manufacturing
Energy
Social Impact
Company Size
51-200
Company Stage
Series B
Total Funding
$204M
Headquarters
San Francisco, California
Founded
2020
Simplify's Take
What believers are saying
- Louisiana facilities Phase 1 operational 2026, Phase 2 100,000 tpa by 2027.
- Microsoft, Meta, Shopify, JPMorgan signed major carbon removal purchase agreements.
- Japanese investors including Mitsui, Mitsubishi, Japan Airlines committed $150M Series B.
What critics are saying
- Climeworks Mammoth (36,000 tpa) and Carbon Engineering STRATOS (500,000 tpa) outpace Heirloom.
- DOE Project Cypress funding delays threaten Phase 2 100,000+ tpa expansion.
- Local opposition to Louisiana facilities risks construction delays and legal challenges.
What makes Heirloom Carbon unique
- Limestone-based mineralization accelerates CO2 capture from years to three days.
- First commercial DAC facility operational in California since end of 2023.
- Closed-loop system reuses materials, enabling continuous scalable carbon capture.
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Funding
Total Funding
$204M
Above
Industry Average
Funded Over
3 Rounds
Industry standards
Benefits
Covered health, dental and vision
Generous parental leave. 16 weeks paid leave for all Heirloom employees, regardless of primary/secondary caregiver status.
Generous stock options
Flexible time off. Unlimited PTO for exempt (salaried) employees & 80 hours for full time non-exempt (hourly) employees.
Stay healthy. Monthly health and wellness reimbursement.
Learn on the job. Robust annual education and conference budget, including airfare and hotel costs.
Growth & Insights and Company News
6 month growth
↑ 0%1 year growth
↑ 0%2 year growth
↑ 4%United Airlines announced that its United Airlines Ventures (UAV) Sustainable Flight Fund has made an investment in Direct Air Capture (DAC) company Heirloom, alongside an agreement for the right to purchase up to 500,000 tons of carbon dioxide removal to make sustainable aviation fuel. Launched in 2023, the UAV Sustainable Flight Fund invests in and […]
Heirloom Carbon, a carbon capture startup, raised $150 million in a Series B round led by Future Positive and Lowercarbon Capital, with participation from investors like Ahren Innovation Capital and Japan Airlines. Heirloom's technology captures CO2 from the air using a unique process involving limestone. The funds will be used to build a carbon capture facility in Louisiana by 2026. The company aims to reduce carbon removal costs to $200-$300 per metric ton by the early 2030s.
MOL Switch LLC, a subsidiary of Mitsui O.S.K. Lines, has invested in Heirloom Carbon Technologies, a U.S. company developing Direct Air Capture (DAC) technology. This investment is part of a $150 million funding round, which includes other Japanese companies like Mitsui & Co. and Japan Airlines. Heirloom's DAC technology uses limestone to reduce costs and aims to remove 1 million tons of CO2 annually, supported by up to $600 million from the U.S. Department of Energy.
Heirloom, America’s leading Direct Air Capture (DAC) technology provider, has raised $150 million in Series B funding. The round was co-led by Future
Four Japanese companies, including Mitsui & Co., Mitsubishi Corp., Mitsui O.S.K. Lines, and Japan Airlines, are investing in Heirloom Carbon Technologies, the first commercially operational U.S. business focused on removing carbon dioxide from the air.
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About Heirloom Carbon
Industries
Industrial & Manufacturing
Energy
Social Impact
Company Size
51-200
Company Stage
Series B
Total Funding
$204M
Headquarters
San Francisco, California
Founded
2020
There are no jobs for Heirloom Carbon right now.
Find jobs on Simplify and start your career today