Brimstone
Brimstone is an Industrial Decarbonization company founded in 2019 and based in Oakland, United States. It has raised $80M in total funding, most recently a Series A in 2022.
Founded in 2019 by Cody Finke and Hugo Leandri, Oakland-based Brimstone replaces the limestone feedstock in conventional cement-making with abundant calcium silicate rock, which releases no process CO2 when converted to lime, and yields magnesium minerals that absorb ambient CO2 — a process the company describes as carbon-negative. Its output is standard ASTM-grade ordinary portland cement plus supplementary cementitious material. Brimstone has raised more than $80M from backers including Breakthrough Energy Ventures, DCVC and Amazon's Climate Pledge Fund, and in 2024 was selected for a $189M U.S. DOE Industrial Demonstrations award (later cancelled) toward its first commercial plant.
Cement is roughly 8% of global CO2 emissions; Brimstone targets the process emissions directly rather than capturing them after the fact.
brimstone.com ↗·Industrial Decarbonization·
United States·private 
