Total amount raised
$205M
Latest funding date
2025-12-02
Location
Heirloom has successfully raised funding over 7 rounds, with the latest round being undisclosed. The company is backed by 30 investors, including the Development Bank of Japan and Chiyoda Corporation.
Heirloom's innovative approach leverages the natural process of carbon mineralization using limestone to remove CO₂ from the atmosphere. Keep reading to explore the intricacies of Heirloom's fundraising journey and the investors backing this pioneering platform.
Heirloom has raised funding across multiple rounds backed by over 30 investors, including Future Positive, Lowercarbon Capital, Breakthrough Energy Ventures, and the Development Bank of Japan.
Keep reading to explore the intricacies of Heirloom's fundraising journey and the investors backing this pioneering platform.
What Is Heirloom?
Heirloom, based in Brisbane, California, is a private company specializing in direct air capture (DAC) technology that enhances the natural process of CO₂ absorption from the atmosphere. Founded in 2020, the company operates in carbon capture, mineral processing, and sustainability sectors. Heirloom uses a unique limestone-based approach to accelerate carbon mineralization and operates commercial DAC facilities in Louisiana and California, powered by renewable energy. The company employs 101–250 people and has secured supply agreements with major corporations including Microsoft, Stripe, and Meta.
How Much Funding Has Heirloom Raised?
- Seed Round
- Amount Raised: USD 1,000,000
- Date: May 2021
- Lead Investors: Prelude Ventures, Breakthrough Energy Ventures, Lowercarbon Capital, MCJ Collective
- Grant (NSF)
- Amount Raised: USD 255,737
- Date: June 2021
- Lead Investors: National Science Foundation
- Series A
- Amount Raised: USD 53,000,000
- Date: March 17, 2022
- Lead Investors: Carbon Direct Capital Management, Ahren Innovation Capital, Breakthrough Energy Ventures
- Participants: Microsoft Climate Innovation Fund, Breyer Capital, Grantham Environmental Trust, Lowercarbon Capital, TIME Ventures, Carbon Removal Partners, Seven Seven Six
- Grant
- Amount Raised: USD 1,000,000
- Date: April 2022
- Lead Investors: Undisclosed
- Series B
- Amount Raised: USD 150,000,000
- Date: December 4, 2024
- Lead Investors: Future Positive, Lowercarbon Capital
- New Investors: H&M Group, Japan Airlines, Mitsubishi Corporation (Americas), Mitsui & Co., MOL Switch LLC, Quantum Innovation Fund, Siemens Financial Services
- Repeat Investors: Ahren Innovation Capital, Breakthrough Energy Ventures, Carbon Direct Capital, MCJ Collective
- Equity Investment (Series B Extension)
- Amount Raised: Undisclosed
- Date: February 25, 2025
- Lead Investors: United Airlines Ventures (Sustainable Flight Fund)
- Undisclosed Round
- Amount Raised: Undisclosed
- Date: December 2, 2025
- Lead Investors: Development Bank of Japan, Chiyoda Corporation
Total Amount Raised: at least $205.3M based on disclosed funding. Several rounds include undisclosed amounts that are not reflected in this total.
Key Investors
- Future Positive
- Details: Future Positive is a venture capital firm focused on investing in companies addressing global challenges. It co-led Heirloom's $150M Series B in December 2024. Investment focus: climate technology and sustainability.
- Lowercarbon Capital
- Details: Lowercarbon Capital, co-founded by Chris Sacca, focuses on investments in carbon removal and clean energy. It co-led the Series B and participated in both the Seed and Series A rounds. Investment focus: decarbonization technologies.
- Breakthrough Energy Ventures
- Details: Founded by Bill Gates, Breakthrough Energy Ventures backs companies developing clean energy breakthroughs. It participated in Heirloom's Seed, Series A, and Series B rounds. Investment focus: clean energy and carbon removal.
- Development Bank of Japan
- Details: A Japanese government-owned financial institution supporting Green Transformation initiatives. It made its first-ever DAC investment in Heirloom in December 2025. Investment focus: infrastructure, energy, and sustainability.
- Ahren Innovation Capital
- Details: A UK-based deep tech venture firm that co-led Heirloom's Series A and participated in the Series B. Alice Newcombe-Ellis of Ahren joined Heirloom's board. Investment focus: science-led climate and technology companies.
What's Next for Heirloom?
Heirloom stands at the cusp of significant opportunities, driven by its innovative Direct Air Capture (DAC) technology. With a substantial $150 million Series B funding and involvement in Project Cypress, which is eligible for up to $600 million in government funding, the company is well-positioned to scale its operations. The project aims to remove one million tons of CO₂ annually and create nearly 1,000 jobs in Louisiana, highlighting the vast potential for growth in the climate-tech sector.
Future fundraising opportunities appear promising as Heirloom continues to attract investment from both private and public sectors. The company's strategic partnerships with major corporations like Microsoft, Stripe, and Meta further bolster its financial prospects. However, challenges such as reducing the cost of DAC technology, scaling operations, and navigating regulatory landscapes remain. Overcoming these hurdles will be crucial for Heirloom to fully capitalize on its growth potential and continue leading in the carbon removal industry.
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