Meet an Unreasonable Venture

Brimstone

Developing carbon-neutral Portland cement

Cody Finke

Co-Founder & CEO at Brimstone

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brimstone.com

Employees 51–100

Headquarters Oakland, California, United States

Founded in 2019, Brimstone is a developer of a novel process that produces cement without carbon emissions while maintaining cost competitiveness with traditional cement.

The world produces over 4 billion tons of cement annually—a number only expected to grow. The problem is that cement production accounts for 7.5% of global CO2 emissions, with a total climate impact just behind cars. Brimstone has developed a breakthrough carbon-negative process to produce the same ordinary Portland cement and supplementary cementitious materials used today. These materials have the same quality and performance builders have trusted for over 150 years — now with a positive climate impact. Brimstone's investors include Breakthrough Energy Ventures, DCVC, Collab Fund, Amazon Climate Pledge, and Fifth Wall.

Energy & Environment

Notable Achievements

Developed the world's first process to make industry-standard portland cement without process emissions as certified by a third party and covered in the Washington Post.
Raised a $55M Series A from leading climate investors, including Breakthrough Energy Ventures, DCVC, Collaborative Fund, Fifth Wall, S2G Ventures, Amazon Climate Pledge, Acceler8, Gatemore, Impact Science Ventures, Osage University Partners, and SystemIQ.
Solution has been recognized by the International Energy Agency, the Washington Post, CNBC, CBS, and honored as one of TIME's Best Inventions of 2023.

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Press Mentions

July 16, 2025

Oakland startup aims to make cement production greener

Brimstone is pioneering an innovative cement production process that significantly reduces carbon emissions. By utilizing alternative materials, the company aims to revolutionize the industry,...

Read on San Francisco Examiner »

July 1, 2025

Brimstone advances plans to build first new U.S. Alumina plant in over 50 years

Brimstone is making significant progress in establishing the first new alumina plant in the U.S. in over fifty years, aimed at enhancing the aluminum supply chain. This development underscores...

Read on BIC Magazine »

June 30, 2025

Brimstone Advances Oklahoma Plans to Build First New U.S. Alumina Plant in 50+ Years

Brimstone is advancing its plans to construct the first new alumina plant in the U.S. in 50 years, located in Oklahoma. This initiative promises to enhance domestic alumina production and...

February 6, 2025

Brimstone plans to expand beyond cement with low-carbon aluminium production

Brimstone is expanding its innovative approach beyond cement to include low-carbon aluminium production. This strategic move highlights the company's commitment to sustainability and positions it...

Read on alcircle »

January 10, 2025

Brimstone's decarbonised cement manufacturing process pioneers smelter-grade alumina production

Brimstone is revolutionizing the cement industry with its innovative decarbonized manufacturing process, which also enables the production of smelter-grade alumina. This advancement significantly...

Read on alcircle »

September 20, 2024

How To Choose A Money-Making Busines - Melissa Houston

Brimstone is celebrated for its innovative approach to sustainable business practices, showcasing how companies can thrive while prioritizing environmental responsibility. Their success story...

Read on Hustle24 »