Heirloom is a climate-tech company founded in 2020 that is scaling a next-generation direct air capture platform designed to provide the most cost-effective path to gigaton-scale carbon removal. Its process accelerates natural carbon mineralization to pull CO₂ directly from ambient air, after which the captured gas can either be permanently sequestered underground or used to produce sustainable aviation fuel. The company is headquartered in Brisbane, California, and positions its technology to serve multiple decarbonization roles across energy and industrial markets. Heirloom has raised at least $150 million to date, including a Series B round led by climate-focused investors and airlines such as Japan Airlines, Mitsubishi Corporation, and Mitsui & Co., followed by a separate investment from United Airlines. Newly added strategic investors—the Development Bank of Japan and engineering firm Chiyoda—bring financial strength and large-scale project expertise that Heirloom intends to leverage for global deployment. These Japanese partnerships also poise the company to issue carbon credits within Japan’s emerging GX-ETS compliance market, expected to become Asia’s second-largest by 2026. Management describes the technology as versatile, capable of supporting clean-fuel production as well as permanent removals, and sees the fresh capital and alliances as critical to accelerating large-scale DAC facilities worldwide.

Total raised

$203M

Funding rounds

3

Latest round

Series B

Latest activity

Dec 2024