Heirloom key facts
as of Oct 2026- Developer of a carbon capture and utilization technology designed to enhance the natural process of carbon dioxide absorption from the atmosphere.
- Heirloom is valued at approximately $253.0M as of Oct 2026 (last reported valuation).
- It has raised $57.6M; the latest was Early Stage VC in Dec 2025.
- Notable investors include Plug and Play Tech Center, US National Science Foundation, Impact Assets, U.S. Department of Energy, Breakthrough Energy — 48 tracked in total.
- Status: Privately Held (backing).
Heirloom's last reported valuation, Jan 2022. Nothing priced has surfaced since.
- ·The complete investor list: 48 names
- ·Watch Heirloom: the Monday email on marks, rounds and moves
Heirloom funding rounds
No funding rounds for Heirloom are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
Who backs Heirloom
48+Heirloom valuation
Heirloom's last reported valuation was $253 million in Jan 2022. No priced round, secondary trade or fund mark has surfaced since.
Heirloom investors
48 investors are on record for Heirloom, including Plug and Play Tech Center, US National Science Foundation, Impact Assets and U.S. Department of Energy. By type, the record holds 10 venture capital firms and 1 growth equity firm.
About Heirloom
Developer of a carbon capture and utilization technology designed to enhance the natural process of carbon dioxide absorption from the atmosphere. The company's technology accelerates limestone's ability to capture carbon dioxide, storing it permanently underground while operating with renewable energy, enabling businesses to meet sustainability goals and get a cost-effective method for significant carbon removal.
- Sector
- Business Products and Services (B2B)
- HQ
- Brisbane, CA, United States
- Founded
- 2020
- Employees
- 180
- Website
- heirloomcarbon.com/
- Ownership
- Privately Held (backing)
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