Heirloom Carbon Technologies
PrivateLast Round
Strategic
Dec 2, 2025
Total Funding Raised
$204.73M
Company Overview
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, Advanced Materials
Business Model
B2B
Customer Profile
Usage-Based SaaS, Government Contracts
AI Layer
Non-AI
Keywords
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 |
|---|---|---|
| Climeworks | 90% | |
| CarbonCapture Inc. | 86% | |
| Charm Industrial | 83% |
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 |
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 |
Market signals
Structured signals derived from secondary market and firmographic data.
- Feb 17, 2026
Stripe, Shopify, and Klarna are early customers.
- Dec 4, 2024
$150M raised in Series B round.
Recent news
Latest coverage and updates
- signs_new_clientAug 20, 2026
Heirloom Carbon signs new client H&M group.
- signs_new_clientAug 20, 2026
Heirloom Carbon signs new client Autodesk, Inc.
- signs_new_clientAug 20, 2026
Heirloom Carbon signs new client J.P. Morgan SE.
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.
Request accessFrequently Asked Questions
Common questions about Heirloom Carbon Technologies's valuation, stock price, and market status.
Is Heirloom a public or private company?
Heirloom is a private company.
What is the current stock price of Heirloom?
Heirloom is a private company with no public stock price. No recent secondary market data is available.
How much is Heirloom worth (valuation)?
Valuation information for Heirloom is not publicly available.
Can I buy Heirloom stock?
Heirloom shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors. Visit https://www.caplight.com to learn more.
When was Heirloom's last funding round?
Heirloom's most recent funding round was Strategic on February 25, 2025.
Who are the main investors in Heirloom?
Key investors in Heirloom include Carbon Direct Capital Management, Prelude Ventures, Breakthrough Energy Ventures, Breakthrough Energy Foundation, Energy Ventures.
Will Heirloom IPO soon?
No public IPO plans have been announced for Heirloom.
How can I track Heirloom secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor Heirloom's secondary market activity and sign up for updates.