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Cocoon

London, GB · Founded 2023 · 12 known investors

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Cocoon develops low-carbon construction materials, including LoopCem, a supplementary cementitious material (SCM) made by valorizing electric arc furnace (EAF) steel slag to reduce concrete emissions. It serves the construction and cement industry with the aim of enabling net-zero building.

Circular EconomyCleantechClimate TechNew Materials

Founders & leadership

Cocoon was founded in 2023 by Eliot Brooks and William Knapp.

EBEliot Brooks
Eliot BrooksCEOEliot Brooks previously co-founded Thriva Health, where he served as COO and director from 2016 to 2023, and earlier worked in product at Tandem Bank and managed international payments at Travelex. He took part in the New Entrepreneurs Foundation's 2014 cohort and chaired the school governors at The Courtyard school in Islington from 2022 to 2025.
WKWilliam Knapp
William KnappFounder
FSFreddie Scott
Freddie ScottCTO

Investors · 12

Brick Mortar Ventureslisted by Brick Mortar VenturesSan Francisco

How we know: Brick Mortar Ventures's portfolio page · Not right? Tell us

Gigascale Capitallisted by Gigascale CapitalPalo Alto
SOSVlisted by SOSVNew York · $30K – $550K

How we know: SOSV's portfolio page · Not right? Tell us

The Venture Collectivelisted by The Venture CollectiveMiami Beach · $100K – $500K
Wireframe Ventureslisted by Wireframe VenturesSan Francisco · $500K – $2M

How we know: Wireframe Ventures's portfolio page · the VCSheet dataset · Not right? Tell us

First Round CapitalreportedSan Francisco · $100K – $20M

How we know: techcrunch.com · Not right? Tell us

Index VenturesreportedSan Francisco · $540K – $10.8M

How we know: techcrunch.com · Not right? Tell us

Magnify VenturesreportedSanta Monica · $250K – $2M

How we know: techcrunch.com · Not right? Tell us

SemperVirens Venture CapitalreportedSan Mateo

How we know: techcrunch.com · Not right? Tell us

SpringbankreportedNew York · $500K – $1.5M

How we know: pulse2.com · Not right? Tell us

XYZ Venture CapitalreportedSan Francisco · $10K – $5M

How we know: techcrunch.com · Not right? Tell us

Funding

SEC filings, press & company announcements

$15M disclosed across 1 of 4 rounds · 2021–2026

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 7

Carbon Cure TechnologiesCarbonCure develops technologies that inject captured CO₂ into fresh concrete during mixing, where it mineralizes and permanently embeds in the material while reducing the amount of cement needed. The company sells these systems to cement and concrete producers to help lower the embodied carbon of concrete and the built environment.
CarbonCarbon provides 3D printing hardware, photopolymer resins, and computational design software that brands use to design, develop, and manufacture high-performance products. Its technology targets applications in comfort and protection products across consumer and industrial markets.
Solid CarbonSolid Carbon develops carbon-based building materials for use in concrete and construction to reduce embodied carbon in infrastructure. The company operates at the intersection of climate strategy, construction constraints, and materials science.
Living CarbonLiving Carbon develops precision-bred tree varieties and reforestation techniques to convert marginal land into carbon-sequestering ecosystems. The company targets climate mitigation through enhanced photosynthesis and biodiversity restoration.
BrimstoneBrimstone develops co-production processes to manufacture cement, steel, aluminum, and other critical minerals from a single feedstock in an integrated facility. The company targets heavy industry producers seeking lower-cost, more sustainable production methods for materials essential to construction and manufacturing.
Carbonfree ChemicalsCarbonFree operates industrial-scale carbon mineralization facilities that capture CO2 from industrial processes and convert it into carbon-negative products. The company serves industrial manufacturers and chemical buyers seeking sustainable production and carbon reduction solutions.
CarbonBuiltCarbonBuilt makes low-carbon concrete masonry and hardscape products by replacing up to half the cement with its proprietary upcycled binder, reducing the carbon footprint of concrete production. It targets the construction materials market with products priced and performing comparably to conventional concrete.

Companies working in the same space as Cocoon.

In the news

Cocoon Carbon Raises $15M in Series A Fundingfinsmes.com · Mar 2026Cocoon Raises $5.4M in Pre-Seed Fundingfinsmes.com · Aug 2024

Frequently asked questions

What does Cocoon do?
Cocoon develops low-carbon construction materials, including LoopCem, a supplementary cementitious material (SCM) made by valorizing electric arc furnace (EAF) steel slag to reduce concrete emissions. It serves the construction and cement industry with the aim of enabling net-zero building.
Who founded Cocoon?
Cocoon was founded by Eliot Brooks, William Knapp in 2023.
Who are Cocoon's investors?
Cocoon's investors include 2150, Brick Mortar Ventures, Gigascale Capital, SOSV, The Venture Collective, Wireframe Ventures, First Round Capital, Index Ventures and 4 more.
How much funding has Cocoon raised?
Cocoon has disclosed $15M raised across 1 of its 4 known rounds.
Where is Cocoon headquartered?
Cocoon is headquartered in London, GB.