The world’s most valuable carbon capture startups

Companies that capture CO2 and keep it out of the atmosphere: direct air capture, capture technology for industrial plants, engineered carbon removal (bio-oil and biomass burial, rock weathering, mineralisation, ocean-based removal, biochar), CO2 storage, and the conversion of captured CO2 into fuels, chemicals and building materials. Ranked worldwide by AI-estimated valuation, with listed carbon capture pure players shown in grey at their market value for reference. The market sets the value; our AI estimates it.

Key metrics for this segment: key milestone. Figures as published by each company or the press, dated, not recalculated. The AIs weigh them alongside funding history and comparables.

Not in this segment. Listed, so not ranked: Capsol Technologies (shown in grey), LanzaTech and Calix; Aker Carbon Capture is in liquidation. Bought by a group: Carbon Engineering and Holocene (Occidental), Mosaic Materials (Baker Hughes), Global Thermostat (assets sold). Created by a group or a state: Carbfix (Reykjavik Energy), Northern Lights (Equinor, Shell, TotalEnergies), Summit Carbon Solutions, Carbon TerraVault, Entropy, AspiraDAC. Closed: Running Tide, Noya. In other segments: carbon credit marketplaces and project developers (Climate Impact X, Corporate Carbon) under Carbon credits, carbon accounting software under Carbon accounting & ESG, synthetic fuels built on green hydrogen (Southern Green Gas) under Hydrogen, low-carbon cement without capture (Brimstone), nature-based removal (Living Carbon) and biocoal (Airex Energy). Chinese companies (Carbonology, Feynman Dynamics) are never ranked. A company appears in one segment only. Method