How much funding has Brimstone raised?

Brimstone has raised $21.0M in total funding, most recently a Venture Round.

Who are Brimstone's investors?

Brimstone's investors include Kajima Ventures.

Where is Brimstone headquartered?

Brimstone is headquartered in Oakland, California, United States.

What industry is Brimstone in?

Brimstone operates in Climate Tech, Manufacturing.

How many employees does Brimstone have?

Brimstone has 51-200 employees.

Brimstone

Transforming Industry

Oakland, United States · Founded 2019 · $21.0M raised

Climate Tech

Manufacturing

Headquarters: Oakland, California
Employees: 51–200
Founded: 2019
Business Model: B2B

Website: brimstone.com
Total Funding: $21.0M
Last Round: $21.0M Venture RoundAug 2025
Rounds: 1

About

Brimstone is a deep tech company developing the Rock Refinery, a patented co-production process that refines calcium-bearing silicate rock into portland cement, supplementary cementitious materials (SCM), alumina, and other industrial materials. The process eliminates CO2 emissions tied to limestone calcination, which accounts for the majority of cement's carbon footprint, while delivering cost-competitive products at industrial scale.

Summary

Brimstone is a Climate Tech company based in Oakland, United States, founded in 2019. It has raised $21.0M in total across 1 round, most recently a $21.0M Venture Round round in Aug 2025. Investors include Kajima Ventures.