What is Heirloom Carbon?
Direct air capture that accelerates limestone's natural CO2 mineralization cycle.
- Category
- Direct air capture
- Headquarters
- San Francisco, CA
- Founded
- 2020
- Employees
- Private; about 177-200+ reported across public/private sources
- Total funding
- About $203M disclosed/reported funding
- Valuation
- Not disclosed
What is Heirloom Carbon?
Heirloom Carbon develops direct air capture facilities that use limestone mineralization to permanently remove CO2 from the atmosphere.
Heirloom Carbon accelerates the natural CO2 absorption cycle of rocks from years to days and pairs capture with permanent storage or utilization pathways. Revenue and ARR are not publicly disclosed; customer count is not publicly disclosed. Its public positioning is cost-focused direct air capture supplier for corporate and public-sector carbon removal demand.
As of June 2026, Heirloom Carbon is best read as a Series B DAC company scaling from first facilities toward larger North American projects. The most important operating signals are $150M Series B, Louisiana $475M facility announcement, Frontier offtake participation, and first North American DAC facility signals. Heirloom Carbon remains private company, so exact margins, revenue mix, and customer contract values are not publicly reported unless stated by the company.
What does Heirloom Carbon offer?
Heirloom offers direct air capture, carbon removal credits, commercial offtakes, and DAC facility development.
- Direct air capture· Carbon removal
- Limestone looping· Core process
- Carbon removal credits· Commercial
- DAC facilities· Infrastructure
- Permanent storage partnerships· Storage
How does Heirloom Carbon make money?
Heirloom earns revenue by selling durable carbon removal tonnes through offtakes, public procurement, and project partnerships.
No public list pricing; commercial pricing is quoted by deployment, customer scale, geography, and service scope. Pricing is contracted by tonne, delivery vintage, durability, project risk, and buyer commitment; no public self-serve price list is maintained.
Growth depends on facility scale, energy and sorbent cost, storage access, public incentives, offtake demand, and MRV confidence. For sellers, the most relevant budget owners are carbon procurement, sustainability, project finance, facilities, government programs, storage partners, and industrial project teams; procurement maturity should be treated as startup or growth-stage, with technical founders and operators close to vendor decisions.
Who leads Heirloom Carbon?
Heirloom Carbon is led by Shashank Samala, Co-founder and Chief Executive Officer; Noah McQueen, Co-founder / Head of Research; Zack Bloom, Co-founder.
- Shashank SamalaCo-founder and Chief Executive OfficerCo-founder since 2020Leads Heirloom's DAC commercialization.
- Noah McQueenCo-founder / Head of ResearchCo-founder since 2020Technical founder tied to the limestone DAC process.
- Zack BloomCo-founderCo-founder since 2020Public co-founder in private-market profiles.
How do you contact Heirloom Carbon's leadership?
Heirloom Carbon publishes official company contact routes, but reviewed public sources do not verify personal executive email addresses. Use the company route below or a verified LinkedIn/workflow enrichment step before sending individual outreach.
Official routes at heirloomcarbon.com; personal executive pattern not verifiedHow much funding has Heirloom Carbon raised?
About $203M disclosed/reported funding; latest disclosed financing: $150M Series B in December 2024 co-led by Future Positive and Lowercarbon Capital. Not disclosed
2022: Series A, $53M, led by climate investors, valuation not disclosed; Dec 2024: Series B, $150M, led by Future Positive and Lowercarbon Capital, valuation not disclosed.
The company has not publicly disclosed every valuation or all small non-dilutive awards, so totals should be read as disclosed funding rather than a fully audited capitalization table. The latest financing signal matters because it funds commercial DAC scale-up, facilities, engineering, and carbon removal deliveries.
How did Heirloom Carbon get here?
Heirloom Carbon's path is defined by founding, technical validation, financing, and commercialization milestones.
- 2020FoundedHeirloom forms around accelerated limestone DAC.
- 2022$53M Series AHeirloom raises Series A to scale DAC.
- Nov 2023Frontier offtakeFrontier buyers sign offtake agreements with Heirloom and CarbonCapture.
- 2023First commercial DAC facilityHeirloom opens a commercial DAC facility in California.
- Dec 2024$150M Series BFuture Positive and Lowercarbon co-lead financing.
- 2024$475M Louisiana facilityLouisiana announces Heirloom DAC facility investment plan.
Who are Heirloom Carbon's competitors?
Heirloom Carbon competes with companies in undefined.
Heirloom Carbon — frequently asked questions
