When was Heirloom founded?

Heirloom was founded in 2020 and raised its 1st funding round 1 year after it was founded.

Where is Heirloom located?

Heirloom is headquartered in San Francisco, United States.

How many employees does Heirloom have?

As of Aug 31, 2026, the latest employee count at Heirloom is 137.

Is Heirloom a funded company?

Heirloom is a funded company, having raised a total of $203M across 8 funding rounds to date. The company's 1st funding round was a $***** Seed round, raised on May 26, 2021.

When was the latest funding round of Heirloom?

Heirloom's latest funding was a $***** Series B round on Dec 02, 2025, with participation from 2 investors.

Where does Heirloom rank among its competitors?

Heirloom ranks 3rd amongst 358 active competitors, of which 105 are funded. It stands 4th in terms of total funding among its competitors. The most recent competitor to raise funding was Heirloom, which secured an undisclosed amount in Dec, 2025.

Who are the top competitors of Heirloom?

Heirloom's top competitors include Carbon Clean, Mission Zero and CarbonCapture. Among them, Heirloom secured the most recent funding round in December, 2025.

Heirloom - 2026 Company Profile, Team, Funding & Competitors

Heirloom is a series B company based in San Francisco (United States), founded in 2020 by Zack Bloom. It operates as a Provider of direct air capture technology for permanent carbon dioxide removal. Heirloom has raised $203M in funding from investors like Development Bank of Japan, Prelude Ventures and S I Energy Ventures. The company has 358 active competitors, including 105 funded and 13 that have exited. Its top competitors include companies like Carbon Clean, Mission Zero and CarbonCapture.

Company Details

Provider of direct air capture technology for permanent carbon dioxide removal. The company accelerates natural carbon mineralization to capture carbon dioxide from the atmosphere. It integrates this mineralization approach into direct air capture facilities. The company’s facilities are powered by renewable energy and constructed with labor protections.

Website: www.heirloomcarbon.com/
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Email ID: *****@heirloomcarbon.com

Key Metrics

Founded Year

2020

Location

San Francisco, United States

Stage

Series B

Total Funding

$203M in 8 rounds

Latest Funding Round

Series B, Dec 02, 2025, $*****

Investors

Development Bank of Japan & 34 more

Ranked

3^rd among 358 active competitors

Employee Count

137 as on Aug 31, 2026

Similar Companies

Mission Zero & 91 more

View Heirloom's full profile

Heirloom is associated with 1 legal entity given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Documents
HEIRLOOM CARBON TECHNOLOGIES, INC. CIN: 7908416 , United States, Active	Mar 19, 2020	-	54 (As on Dec 31, 2022)	-

Heirloom has raised a total funding of $203M over 8 rounds. Its first funding round was on May 26, 2021. Its latest funding round was a Series B round on Dec 02, 2025 for $*****. 2 investors participated in its latest round. Heirloom has 35 institutional investors.

Here is the list of recent funding rounds of Heirloom:

Filter this list

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Dec 02, 2025	7187914	Series B	6029914	3654663	3373955	5524305
Feb 25, 2025	6484489	Series B	4473853	5758991	8207707	United Airlines
Dec 04, 2024	5171594	Series B	6384551	7716262	Future Positive	Lowercarbon Capital & 9 more

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View details of Heirloom's funding rounds and investors

The founders of Heirloom is Zack Bloom. Shashank Samala is the CEO of Heirloom.

Here are the details of Heirloom's key team members:

Zack Bloom: Co-Founder of Heirloom and founder of 1 other company. They are also an angel investor in 1 startup.
Contact Info: 1 email address

View details of Heirloom's Founder profiles and Board Members

Heirloom's employee count trend

Heirloom has 137 employees as of Aug 26. Here is Heirloom's employee count trend over the years:

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Top competitors of Heirloom include Carbon Clean, Mission Zero and CarbonCapture. Here is the list of Top 10 competitors of Heirloom, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	Carbon Clean 2009, London (United Kingdom), Series C	Developer of technology for industrial carbon capture and utilisation solutions	$243M	Chevron, Equinor & 61 others	68/100
2nd	Mission Zero 2020, London (United Kingdom), Series A	Developer of technology to recover carbon dioxide from the atmosphere	$32.8M	Breakthrough Energy, 2150.VC & 12 others	64/100
3rd	Heirloom 2020, San Francisco (United States), Series B	Provider of direct air capture technology for permanent carbon dioxide removal	$203M	Prelude Ventures, Japan Airlines & 33 others	62/100
4th	CarbonCapture 2019, Los Angeles (United States), Series A	Developer of modular direct air capture systems and carbon removal credits	$115M	Prime Movers Lab, Rio Tinto & 14 others	63/100
5th	Mombak 2021, Sao Paulo (Brazil), Series C	Provider of large-scale reforestation-based carbon removal. It undertakes native, biodiverse reforestation projects to remove significant amounts of atmospheric carbon. The company works with landowners, utilizing various financial models including outcome bonds, to facilitate these projects. This approach aims to restore degraded land, promote biodiversity, and create economic opportunities. It focuses on building long-term partnerships and employing scientific methods to ensure the integrity and effectiveness of its carbon removal initiatives.	$89.2M	AXA, BNDES & 3 others	62/100
6th	Charm Industrial 2018, San Francisco (United States), Series B	Operator of carbon removal technology converting biomass into bio-oil for sequestration	$108M	Seek Ventures, General Catalyst & 17 others	62/100
7th	NetZero 2021, Paris (France), Series A	Provider of biochar for carbon removal and sustainable agriculture solutions	$38.9M	CMA CGM, Stellantis Ventures & 5 others	61/100
8th	Summit Carbon 2021, Ames (United States), Series A	Operator of a pipeline system for carbon dioxide capture and transport	$1.32B	The Rise Fund, Continental Resources & 2 others	60/100
9th	UNDO 2022, London (United Kingdom), Series B	Provider of carbon removal services	$12M	Lowercarbon Capital, AENU & 57 others	60/100
10th	Climeworks 2009, Zurich (Switzerland), Series E	Provider of direct air capture technology and carbon removal services	$1B	GIC, Partners Group & 16 others	59/100