-17%

est. 2Y upside i

Climate TechSeries B

Mitigating the worst impacts of climate change by developing the world’s most cost-effective DAC technology to permanently remove CO2 from the atmosphere. Our technology rapidly accelerates the natural processes that enable limestone to absorb carbon dioxide from the air from a timespan of years to days.

Rank

#2702

Sector

Climate Tech

Est. Liquidity

~4Y

Data Quality

Data: Low

The equity upside over 2 years is highly uncertain and likely negative given the absence of revenue data, high preference stack (29% of valuation), and expected dilution from future capital raises.

Last updated: July 3, 2026

Bull (10%)+180%

Heirloom achieves major commercial contracts and government funding, driving valuation to ~$2.1B (3x current). IPO window opens. Net of 20% dilution, upside 180%.

Base (52%)+10%

Steady progress with existing customers, valuation grows modestly to ~$900M (1.3x). Net of 20% dilution, upside 10%.

Bear (38%)-100%

Scale-up fails or competition overwhelms; exit below $203M total funding, common stock worthless due to preference stack.

Est. time to liquidity~4.0 years

Preference Stack Risk

high

Funding Intensity

2920%

Total funding of $203M represents 29.2% of the current $695.7M valuation, creating a high preference overhang in downside scenarios.

Dilution Risk

high

Given very high capital intensity and early stage, additional dilutive financing rounds are likely within 2 years, estimated at 20% dilution.

Secondary Liquidity

limited

A secondary market exists at the current valuation, but liquidity is thin; employees may not have a ready exit.

Other — 2 roles

View all 2 open roles at Heirloom →

Last updated: March 10, 2026

Questions to Ask at the Interview

Strategic questions based on Heirloom's data — designed to show you've done your homework.

  • 1

    “How does Heirloom plan to achieve unit economic parity with sub‑$100/ton CO2 removal costs?”

  • 2

    “What are the key milestones to de‑risk the technology and regulatory pathway over the next 18 months?”

  • 3

    “Given the high funding intensity and lack of liquidity, what is the expected timeline to an IPO or acquisition?”

Community

Valuation Sentiment

Our model estimates -17% upside. What do you think?

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Disclaimer: This analysis is AI-generated and does not constitute financial or career advice. Always conduct your own due diligence.