Key facts
- Heirloom’s last known valuation is $253.0M (Jan 2022).
- 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).
- ·The complete investor list — 48 names
- ·Watchlist + deal alerts for Heirloom
- ·The full record, as it builds
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.
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)
Heirloom doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Heirloom shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Heirloom in its N-PORT filings yet. We sweep new filings monthly.