Heirloom Carbon Technologies
PrivateLast Round
Strategic
Dec 2, 2025
Total Funding Raised
$204.73M
Momentum
Top 25%
of companies Caplight tracks
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 Comps
Public and private peers based on sector, stage, and business model.
| Company | Status | Est. Valuation | Rev Multiple |
|---|---|---|---|
| OpenAI | Private | $86.0B | ~40x |
| Cohere | Private | $5.0B | -- |
| Competitor 1 | Public | $XX.XB | XXx |
| Competitor 2 | Public | $XX.XB | XXx |
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.
Heirloom Carbon Technologies Filings
SEC and related filings with document metadata.
| Typed | Date | Amount Offered | Amount Sold | Filling | Pages | Download |
|---|---|---|---|---|---|---|
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Frequently Asked Questions
Common questions about Heirloom Carbon Technologies's valuation, stock price, and market status.