Heirloom

Heirloom is a Carbon Removal company founded in 2020 and based in San Francisco, USA. It has raised $203M in total funding, most recently a Series B in 2024.

Heirloom uses enhanced mineralization to capture atmospheric CO₂ with limestone and delivers permanent carbon removal. $150M+ raised; commercial facility operational in California; offtakes from Microsoft, Stripe, and Shopify.

First direct air capture company delivering commercial carbon removal credits and supporting net-zero energy infrastructure.

heirloomcarbon.com Carbon RemovalUSAprivate

At a glance

Total raised

$203M

last round series b

Headcount

51-200

approximate · public range

Headquarters

San Francisco

USA

Founded

2020

6 years active

Status

Private

Carbon Removal

Subsector

Carbon Removal

Funding history

Total raised

$203M

Rounds tracked

Latest stage

Series B

Date	Stage	Amount	Valuation	Lead investors
Dec 4, 2024	Series B	$150M	—	Future Positive, Lowercarbon Capital
Mar 17, 2022	Series A	$53M	—	Carbon Direct Capital Management, Ahren Innovation Capital, Breakthrough Energy Ventures

Heirloom

At a glance

Funding history

In the news

Leadership

Products

Enhanced Mineralization DAC System

Open roles