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Heirloom Carbon

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Removing 1B tons of CO2 from the air by 2035 by engineering the most cost-effective, scalable direct air capture system

Brisbane, United StatesFounded 2020Energy
Valuation $500M–1B Last recorded · 2024
Headcount 100–500 Current team size
Total funding $100–500M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Heirloom Carbon and the history behind them.

About Heirloom Carbon

Heirloom Carbon is a pioneering startup in the environmental technology sector, focusing on the reduction of atmospheric carbon dioxide (CO2) levels. The company's primary service is the development and deployment of Direct Air Capture technology, a process that extracts CO2 directly from the atmosphere. This technology leverages the natural carbon-absorbing properties of limestone, one of the most abundant rocks on the planet, to accelerate the process of carbon mineralization, transforming CO2 into rock in a matter of days.

Heirloom Carbon's business model revolves around the sale of carbon removal credits, a market-based tool that allows companies to offset their carbon emissions. These credits represent the permanent removal and safe storage of CO2, either underground or within building materials like concrete. The company's first commercial facility, established in 2020, serves as a testament to their rapid technological and business progress.

The startup operates in the growing carbon credit market, catering to environmentally conscious businesses seeking to reduce their carbon footprint. By offering carbon removal credits at a cost of less than $100 per ton of CO2 by 2035, Heirloom Carbon positions itself as an affordable solution for companies aiming to achieve carbon neutrality.

In addition to its environmental impact, Heirloom Carbon also contributes to the green economy by creating high-paying jobs in the environmental technology sector. The company's operations align with principles for responsible carbon removal, ensuring minimal environmental footprint.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2020
Headquarters
Brisbane, United States
Employees
167
Open positions
1
Dealroom signal
64.0/100
Industry
Energy
Sector
Energy, Sustainable Development Goals, Carbon Capture and Storage, Climate Tech, Direct Air Capture, Carbon Removal, Hard Tech, DT and LS, science-based
Technology
Hardware, Deep Tech
Business model
Manufacturing
Client focus
b2b

Funding history

4 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES BOther financing Dec 2024 $150M $600M H&M · Mitsubishi · Breakthrough Energy Ventures · Ahren Innovation Capital ↗
SERIES AOther financing Mar 2022 $53M $212M Breakthrough Energy Ventures · Microsoft Climate Innovation Fund · Carbon Direct · Bill Gates ↗
Showing the latest 2 of 4 recorded eventsBook a demo for the full funding history →

Growth signals

Heirloom Carbon website traffic

Latest recorded traffic for Heirloom Carbon is 3.5K monthly website visits, down 61.5% over the last three months. Heirloom Carbon's team declined 7.2% over the past year.

Latest monthly visits3.5K 3-month web change-61.5% 1-year team growth-7.2%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

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Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

19 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed5 investors entered at this stage

  • US National Science Foundation
  • Lowercarbon Capital
  • Prelude Ventures
  • Breakthrough Energy Ventures
  • MCJ Collective

Series A14 investors entered at this stage

  • Carbon Direct
  • Ahren Innovation Capital
  • Microsoft Climate Innovation Fund
  • Bill Gates
  • Future Positive Capital
  • H&M
  • Mitsubishi
  • Carbon Direct Capital Management
  • Quantum Innovation Fund
  • Mitsui
  • Siemens Financial Services
  • Japan Airlines (JAL)
  • United Airlines Venture
  • MOL Switch
Team profiled 15 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
2 countries with
team presence
🇺🇸 United States99.1%
🇨🇦 Canada0.9%
2 countries shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Heirloom Carbon on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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