Heirloom Carbon Technologies
PrivateLast Round
Strategic
Dec 2, 2025
Total Funding Raised
$204.73M
Momentum
Top 10%
of companies Caplight tracks
Company Overview
Heirloom Carbon Technologies operates in Energy & Sustainability and is based in Brisbane, California. Its latest recorded funding round was a Strategic round in December 2025.
Heirloom Carbon Technologies is an environmental services company that develops direct air capture (DAC) solutions by accelerating the natural process of carbon mineralization using limestone to permanently remove CO2 from the atmosphere.
Sector
Energy & Sustainability
Verticals
Carbon Capture, Clean Manufacturing
Business Model
B2B
Customer Profile
Usage-Based SaaS, Government Contracts
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Heirloom Carbon Technologies Comparables
Compare Heirloom Carbon Technologies with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| CarbonCapture Inc. | 88% | |
| Deep Sky | 86% | |
| Climeworks | 85% |
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Heirloom Carbon Technologies Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Strategic | Dec 2, 2025 | ||||
| Series B Extension | Feb 25, 2025 | ||||
| Series B | Dec 4, 2024 | ||||
| Grant | Apr 22, 2022 | ||||
| Series A | Mar 17, 2022 | ||||
Grant | Aug 30, 2021 |
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Key People
Founding team and executive leadership
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Heirloom Carbon Technologies Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Carbon Removal Partners | Series A |
| Development Bank of Japan | Strategic, Series B |
| Breyer Capital | Series A |
| MOL Switch | Series B |
| TIME Ventures | Series A |
| Quantum Energy Partners | Series B |
| TIME Ventures | Series A |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Sep 13, 2026
Monthly visitors increased 41% MoM, reaching 4.9K.
- Aug 12, 2026
Klarna disclosed as an early customer.
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Recent news
Latest coverage and updates
- hiresNov 2, 2026
In 2022, Heirloom Carbon hires Vikrum Aiyer as head of global public policy, following his role as vice president of global public policy and strategic communications at Uber/Postmates.
- signs_new_clientAug 20, 2026
Heirloom Carbon secures a CO2 removal agreement with J.P. Morgan SE, according to Louisiana Economic Development.
- signs_new_clientAug 20, 2026
Heirloom Carbon secures H&M as a client under a CO2 removal agreement.
- signs_new_clientAug 20, 2026
Heirloom Carbon secures a CO2 removal agreement with Autodesk, Inc, according to Louisiana Economic Development.
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Heirloom Carbon Technologies Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Heirloom Carbon Technologies's valuation, stock price, and market status.
Is Heirloom Carbon Technologies a public or private company?
Heirloom Carbon Technologies is a private company.
What is the current stock price of Heirloom Carbon Technologies?
Heirloom Carbon Technologies is a private company, so its shares have no public market price. Caplight tracks Heirloom Carbon Technologies's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Heirloom Carbon Technologies worth (valuation)?
Valuation information for Heirloom Carbon Technologies is not publicly available.
Can I buy Heirloom Carbon Technologies stock?
Heirloom Carbon Technologies shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Heirloom Carbon Technologies's last funding round?
Heirloom Carbon Technologies's most recent funding round was Strategic on December 2, 2025.
Who are the main investors in Heirloom Carbon Technologies?
Key investors in Heirloom Carbon Technologies include Carbon Direct Capital Management, Prelude Ventures, Breakthrough Energy Ventures, Breakthrough Energy Foundation, Energy Ventures.
Will Heirloom Carbon Technologies IPO soon?
No public IPO plans have been announced for Heirloom Carbon Technologies.
How can I track Heirloom Carbon Technologies secondary market activity?
Caplight tracks bids, offers, and trades in Heirloom Carbon Technologies's shares on secondary markets.