Heirloom
Last verified 2026-05-05. JSON
The funding figures on this page are attributed, not sourced: a publisher is on record but no document URL is. How we mark provenance.
| Total raised | $150.0Mattributed |
|---|---|
| Latest round | series-b, $150.0M, 2024-12-01attributed |
| Founded | unknown |
| Headquarters | Brisbane CA |
| Industry | climate|carbon|cleantech |
| Stage | series-b+ |
| Website | heirloomcarbon.com |
Heirloom runs direct-air-capture facilities that strip CO2 from air by accelerating natural limestone mineralization. It sells carbon-removal credits to large corporates with net-zero targets including Microsoft and Frontier. California and Louisiana plants give it combined annual capacity near 320,000 tons, powered by renewables.
Funding rounds
| Date | Round | Amount | Lead |
|---|---|---|---|
| 2024-12-01 | series-b | $150.0M | undisclosed |
Detected tech stack
Cloudflare, Lenis 0.2.28, jsDelivr, jquery 3.5.1, dompurify 2, moment 0
Provenance
| Fact | Status | Basis |
|---|---|---|
| Series B, $150.0M | attributed | crunchbase named as publisher. No document URL on file. |
| Total raised $150.0M | attributed | crunchbase named as publisher. No document URL on file. |
| Company existence | self-reported | heirloomcarbon.com, read 2026-05-05 |
| Description | self-reported | heirloomcarbon.com, read 2026-05-05 |
Nothing on this page is sourced yet. A sourced fact links to a document that states it.
Change history
No change recorded since records began on 2026-09-24.