Brimstone

brimstone.com

Developer of the first carbon-negative process to make ordinary Portland cement and another key concrete ingredient, supplementary cementitious material. The company's technology utilizes carbon-free calcium silicate rock instead of limestone to deliver a product that is identical to conventional materials and cost-competitive at scale. Brimstone was founded by Cody Finke and Hugo Leandri in 2019 and is located in Oakland, CA.