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Minus Materials

Grows 'biogenic limestone' from calcifying microalgae (coccolithophores) as a carbon-negative replacement for quarried limestone in cement.

Low-Carbon MaterialsEarly (Seed)Boulder, COFounded 2021

The interesting angle

Co-founded by CU Boulder scientist Wil Srubar (also a Prometheus Materials co-founder) after a honeymoon snorkeling trip inspired the idea; CEO is Sarah Williams. Has run pilots with Microsoft and Boulder Ready-Mix Concrete.

Related in Low-Carbon Materials

Forge Nano
Thornton, CO
Gevo
Englewood, CO
Prometheus Materials
Longmont, CO
Last updated August 2026Sources: [1][2][3]

Snapshot

Funding
Small/grant-based: $125K CU Lab Venture Challenge, undisclosed SOSV seed, $175K 4 Corners grant (2024), $100K pilot grant. No priced VC round confirmed.
Stage
Early (Seed)
HQ
Boulder, CO
Founded
2021
Target customer
Cement/concrete producers

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