What are the most valued startups in the carbon removal market?

Last updated: 13 July 2026

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The carbon removal market is attracting growing investment across direct air capture, biochar, enhanced weathering, mineralization, biomass storage and ocean-based technologies.

This ranking compares 96 carbon removal startups using their latest reported valuations or our best evidence-based estimates.

We update this list every month to reflect new funding rounds, acquisitions, public-market movements and operating milestones.

And if you want to better understand this new industry, you can download our pitch covering the carbon removal market.

A quick summary table

Metric	Value
Most valuable carbon removal startup	Climeworks, $1.5B–$2.1B
Second most valuable carbon removal startup	1PointFive, $1.0B–$1.8B
Median carbon removal startup valuation	Approximately $54M
Share of carbon removal valuation captured by the top 10	Approximately 57%
Top carbon removal valuation vs. median	Approximately 33 times higher
Median carbon removal valuation-to-capital-raised ratio	Approximately 5.5 times
Carbon removal startups valued at $1B+	4

Top startups in the carbon removal market ranked by valuation

Here is an updated table that ranks the top startups in the carbon removal market based on their latest reported or estimated valuations.

If you want more detaild about their fundraising activity, you can check our list of the startups who have raised the most funding in the carbon removal market.

#	Startup Name	What They Do	Current Valuation ($)	Valuation Confidence Level	Valuation Type	Evidence Status	Total Funding ($)	Funding Confidence Level
1	Climeworks	Direct air capture removal	$1.5B–$2.1B	Partial Confidence	Implied Valuation from Raise	Implied	$1.0B	Partial Confidence
2	1PointFive	DAC and sequestration hubs	$1.0B–$1.8B	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
3	Heirloom	Limestone direct air capture	$1.0B–$1.6B	Partial Confidence	Implied Valuation from Raise	Implied	$203M	Strong Confidence
4	Carbon Engineering	Liquid-solvent direct air capture	$1.1B	Strong Confidence	Acquisition Value	Observed	$110M	Partial Confidence
5	Charm Industrial	Bio-oil carbon sequestration	$650M–$950M	Partial Confidence	Implied Valuation from Raise	Implied	$125M	Partial Confidence
6	CarbonCapture	Modular direct air capture systems	$400M–$650M	Partial Confidence	Implied Valuation from Raise	Implied	$115M	Strong Confidence
7	Verdox	Electrochemical carbon capture systems	$400M–$650M	Partial Confidence	Implied Valuation from Raise	Implied	$80M	Partial Confidence
8	Terradot	Enhanced rock weathering removal	$350M–$550M	Partial Confidence	Implied Valuation from Raise	Implied	$58M	Strong Confidence
9	Neustark	Mineralizes CO₂ in recycled concrete	$350M–$500M	Partial Confidence	Implied Valuation from Raise	Implied	$69M	Partial Confidence
10	Deep Sky	Carbon removal project developer	$320M–$520M	Partial Confidence	Implied Valuation from Raise	Implied	$55M	Strong Confidence
11	Arbor Energy	Carbon-negative power generation systems	$300M–$460M	Strong Confidence	Implied Valuation from Raise	Implied	$55M	Partial Confidence
12	Lithos Carbon	Enhanced rock weathering farms	$280M–$480M	Partial Confidence	Implied Valuation from Raise	Implied	$63M	Strong Confidence
13	44.01	CO₂ mineralization in rock	$220M–$360M	Partial Confidence	Implied Valuation from Raise	Implied	$47M	Full Confidence
14	Aircapture	Modular direct air capture systems	$220M–$300M	Strong Confidence	Implied Valuation from Raise	Implied	$50M	Strong Confidence
15	Exomad Green	Industrial-scale biochar carbon removal	$180M–$320M	Partial Confidence	Revenue or ARR Multiple Estimate	Estimated	$0M	Low Confidence
16	Avnos	Captures carbon while producing water	$180M–$260M	Partial Confidence	Comparables-Based Estimate	Estimated	$128M	Partial Confidence
17	Graphyte	Buries stabilized waste biomass	$180M–$260M	Strong Confidence	Implied Valuation from Raise	Implied	$30M	Partial Confidence
18	Mombak	Amazon reforestation carbon removal	$160M–$280M	Partial Confidence	Implied Valuation from Raise	Implied	$30M	Partial Confidence
19	Vaulted Deep	Injects biomass waste underground	$170M–$250M	Strong Confidence	Implied Valuation from Raise	Implied	$40M	Full Confidence
20	Novocarbo	Operates biochar carbon-removal parks	$160M–$230M	Strong Confidence	Implied Valuation from Raise	Implied	$27M	Full Confidence
21	Varaha	Farm-based carbon removal projects	$140M–$220M	Strong Confidence	Implied Valuation from Raise	Implied	$33M	Strong Confidence
22	Mission Zero Technologies	Electrochemical direct air capture systems	$140M–$220M	Partial Confidence	Implied Valuation from Raise	Implied	$33M	Strong Confidence
23	Paebbl	Makes carbon-storing construction materials	$140M–$200M	Partial Confidence	Implied Valuation from Raise	Implied	$33M	Strong Confidence
24	NetZero	Tropical biochar production facilities	$110M–$170M	Partial Confidence	Comparables-Based Estimate	Estimated	$39M	Strong Confidence
25	Spiritus	Low-energy direct air capture	$120M–$160M	Strong Confidence	Implied Valuation from Raise	Implied	$41M	Full Confidence
26	Andes	Microbial farmland carbon mineralization	$100M–$170M	Partial Confidence	Comparables-Based Estimate	Estimated	$0M	Low Confidence
27	Gigablue	Microalgae-based marine carbon removal	$100M–$165M	Strong Confidence	Implied Valuation from Raise	Implied	$20M	Partial Confidence
28	Captura	Electrochemical ocean carbon removal	$100M–$160M	Strong Confidence	Implied Valuation from Raise	Implied	$58M	Strong Confidence
29	CREW Carbon	Wastewater-based carbon dioxide removal	$100M–$150M	Strong Confidence	Implied Valuation from Raise	Implied	$5M	Full Confidence
30	Capture6	Brine-based carbon and water recovery	$90M–$150M	Partial Confidence	Implied Valuation from Raise	Implied	$34M	Partial Confidence
31	Applied Carbon	Mobile farm biochar production	$90M–$140M	Strong Confidence	Implied Valuation from Raise	Implied	$22M	Strong Confidence
32	Vesta	Coastal olivine carbon removal	$75M–$125M	Partial Confidence	Comparables-Based Estimate	Estimated	$35M	Partial Confidence
33	Greenlyte Carbon Technologies	Captures CO₂ and produces hydrogen	$80M–$120M	Strong Confidence	Implied Valuation from Raise	Implied	$20M	Full Confidence
34	Carbo Culture	Converts biomass into durable biochar	$75M–$115M	Partial Confidence	Comparables-Based Estimate	Estimated	$25M	Partial Confidence
35	Ebb Carbon	Electrochemical ocean alkalinity enhancement	$75M–$105M	Strong Confidence	Announced Private Round Valuation	Observed	$23M	Strong Confidence
36	Mati Carbon	Smallholder rock weathering removal	$50M–$120M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
37	Equatic	Seawater electrolysis and green hydrogen	$65M–$95M	Strong Confidence	Implied Valuation from Raise	Implied	$12M	Strong Confidence
38	Arca	Mineralizes CO₂ in mine tailings	$65M–$95M	Strong Confidence	Implied Valuation from Raise	Implied	$8M	Partial Confidence
39	Origen	Limestone-based carbon removal systems	$60M–$95M	Strong Confidence	Implied Valuation from Raise	Implied	$13M	Full Confidence
40	Carbonity	Industrial-scale biochar production	$60M–$90M	Partial Confidence	Comparables-Based Estimate	Estimated	$0M	Low Confidence
41	Carbyon	Fast-cycling direct air capture	$55M–$85M	Partial Confidence	Comparables-Based Estimate	Estimated	$20M	Partial Confidence
42	UNDO Carbon	Enhanced rock weathering removal	$50M–$90M	Low Confidence	Implied Valuation from Raise	Implied	$12M	Strong Confidence
43	Eion	Agricultural rock weathering removal	$40M–$90M	Low Confidence	Acquisition Value	Estimated	$15M	Partial Confidence
44	Phlair	Hydrolyzer-based direct air capture	$50M–$75M	Partial Confidence	Implied Valuation from Raise	Implied	$13M	Strong Confidence
45	Silicate Carbon	Farmland enhanced rock weathering	$45M–$80M	Partial Confidence	Active Raise Valuation	Estimated	$2M	Partial Confidence
46	Planetary Technologies	Ocean alkalinity carbon removal	$45M–$70M	Partial Confidence	Implied Valuation from Raise	Implied	$15M	Strong Confidence
47	Travertine Technologies	Mineralizes CO₂ from industrial waste	$45M–$70M	Partial Confidence	Implied Valuation from Raise	Implied	$12M	Full Confidence
48	O.C.O Technology	Produces carbon-negative aggregates	$40M–$70M	Low Confidence	Acquisition Value	Estimated	$0M	Low Confidence
49	RepAir	Electrochemical carbon capture technology	$45M–$60M	Strong Confidence	Comparables-Based Estimate	Estimated	$27M	Strong Confidence
50	Myno Carbon	Industrial biochar and renewable power	$35M–$65M	Partial Confidence	Comparables-Based Estimate	Estimated	$6M	Partial Confidence
51	Noya	Modular direct air capture	$35M–$65M	Low Confidence	Comparables-Based Estimate	Estimated	$12M	Strong Confidence
52	Carbofex	Manufactures industrial biochar systems	$30M–$65M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
53	Brilliant Planet	Algae-based carbon removal ponds	$35M–$60M	Low Confidence	Comparables-Based Estimate	Estimated	$12M	Full Confidence
54	Heimdal	Renewable-powered direct air capture	$35M–$60M	Low Confidence	Comparables-Based Estimate	Estimated	$17M	Partial Confidence
55	Mote	Biomass hydrogen with carbon storage	$35M–$60M	Partial Confidence	Implied Valuation from Raise	Implied	$7M	Partial Confidence
56	CarbonBlue	Water-based carbon dioxide removal	$35M–$55M	Partial Confidence	Implied Valuation from Raise	Implied	$10M	Strong Confidence
57	CarbonRun	River alkalinity carbon removal	$30M–$55M	Partial Confidence	Comparables-Based Estimate	Estimated	$1M	Partial Confidence
58	Sustaera	Modular low-temperature carbon capture	$25M–$50M	Low Confidence	Comparables-Based Estimate	Estimated	$12M	Strong Confidence
59	Husk Ventures	Biochar fertilizers from rice residues	$28M–$45M	Partial Confidence	Implied Valuation from Raise	Implied	$5M	Partial Confidence
60	InPlanet	Tropical enhanced rock weathering	$25M–$45M	Low Confidence	Implied Valuation from Raise	Implied	$6M	Full Confidence
61	Sirona Technologies	Modular direct air capture	$25M–$40M	Partial Confidence	Implied Valuation from Raise	Implied	$6M	Full Confidence
62	Skytree	Onsite modular direct air capture	$24M–$40M	Partial Confidence	Implied Valuation from Raise	Implied	$6M	Partial Confidence
63	Standard Biocarbon	Industrial high-carbon biochar production	$23M–$38M	Partial Confidence	Implied Valuation from Raise	Implied	$6M	Partial Confidence
64	Vycarb	Measured water-based carbon storage	$24M–$34M	Strong Confidence	Implied Valuation from Raise	Implied	$5M	Partial Confidence
65	Aircela	Converts captured CO₂ into gasoline	$20M–$35M	Partial Confidence	Implied Valuation from Raise	Implied	$6M	Partial Confidence
66	Metalplant	Nickel phytomining and carbon removal	$20M–$34M	Partial Confidence	Implied Valuation from Raise	Implied	$4M	Partial Confidence
67	NULIFE GreenTech	Biowaste geological carbon storage	$18M–$35M	Partial Confidence	Proxy-Based Estimate	Estimated	$0M	Strong Confidence
68	Octavia Carbon	Kenya-based direct air capture	$19M–$30M	Partial Confidence	Implied Valuation from Raise	Implied	$4M	Strong Confidence
69	Parallel Carbon	DAC plus clean hydrogen	$18M–$30M	Partial Confidence	Comparables-Based Estimate	Estimated	$4M	Full Confidence
70	Biochar Life	Smallholder biochar carbon removal	$15M–$30M	Low Confidence	Revenue or ARR Multiple Estimate	Estimated	$0M	Low Confidence
71	Ucaneo	Biomimetic direct air capture	$18M–$25M	Strong Confidence	Announced Private Round Valuation	Observed	$7M	Partial Confidence
72	Rewind	Deep-sea biomass carbon storage	$15M–$25M	Low Confidence	Comparables-Based Estimate	Estimated	$5M	Strong Confidence
73	NeoCarbon	Cooling-tower direct air capture	$15M–$25M	Partial Confidence	Implied Valuation from Raise	Implied	$5M	Strong Confidence
74	Carboneers	Smallholder biochar carbon projects	$12M–$28M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
75	Cella Mineral Storage	Stores CO₂ in volcanic rock	$12M–$25M	Low Confidence	Proxy-Based Estimate	Estimated	$3M	Partial Confidence
76	Carboniferous	Marine anoxic biomass storage	$10M–$24M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
77	Wakefield BioChar	Produces biochar soil products	$12M–$20M	Partial Confidence	Implied Valuation from Raise	Implied	$3M	Low Confidence
78	Kodama Systems	Automates forestry and biomass management	$12M–$18M	Partial Confidence	Announced Private Round Valuation	Observed	$7M	Full Confidence
79	Takachar	Portable biomass upcycling equipment	$8M–$20M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Strong Confidence
80	Seratech	Develops carbon-negative cement technology	$8M–$18M	Low Confidence	Comparables-Based Estimate	Estimated	$0M	Low Confidence
81	SeaO2	Direct ocean carbon capture	$10M–$15M	Partial Confidence	Implied Valuation from Raise	Implied	$2M	Full Confidence
82	Pacific Biochar	Sells biochar products and credits	$8M–$15M	Low Confidence	Comparables-Based Estimate	Estimated	$0M	Low Confidence
83	Airhive	Fluidized-bed direct air capture	$8M–$15M	Low Confidence	Comparables-Based Estimate	Estimated	$2M	Low Confidence
84	Seafields	Sargassum farming and sequestration	$8M–$15M	Low Confidence	Active Raise Valuation	Estimated	$1M	Partial Confidence
85	InterEarth	Grown biomass underground storage	$6M–$15M	Low Confidence	Proxy-Based Estimate	Estimated	$1M	Partial Confidence
86	NEG8 Carbon	Electrostatic direct air capture	$7M–$14M	Low Confidence	Comparables-Based Estimate	Estimated	$2M	Low Confidence
87	Carbon Lockdown	Wood-vault biomass carbon storage	$5M–$13M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
88	TerraFixing	Cold-climate direct air capture	$6M–$11M	Partial Confidence	Implied Valuation from Raise	Implied	$1M	Strong Confidence
89	Carbon Removals	Develops biomass carbon-removal projects	$5M–$10M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
90	Phykos	Autonomous seaweed carbon removal	$5M–$10M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
91	Planboo	Biochar monitoring and carbon credits	$4M–$8M	Low Confidence	Implied Valuation from Raise	Implied	$1M	Full Confidence
92	AspiraDAC	Solar-powered direct air capture	$3M–$8M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
93	Carbon Kapture	Kelp farming for carbon removal	$3M–$7M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
94	Carbon To Stone	Converts CO₂ into carbonates	$2M–$6M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence
95	BluSky Carbon	Biochar and carbon mineralization	$3M	Full Confidence	Public Market Cap	Observed	$5M	Partial Confidence
96	Carbon Blade	Compact direct air capture systems	$1M–$4M	Low Confidence	Proxy-Based Estimate	Estimated	$0M	Low Confidence

Key valuation trends in the carbon removal market

Insights

The top 10 carbon removal startups represent approximately 57% of the combined midpoint valuation in this ranking, showing that sector value remains concentrated among a small group of scaled platforms.
Climeworks has a midpoint valuation of approximately $1.8B, more than 33 times the market’s median startup valuation of roughly $54M.
Only four carbon removal companies have midpoint valuations above $1B: Climeworks, 1PointFive, Heirloom and Carbon Engineering. This leaves a large valuation gap between the market leaders and the wider startup base.
Direct air capture companies continue to attract premium valuations, but biomass, biochar and mineralization businesses are building a credible middle tier with clearer near-term deployment pathways.
The median valuation-to-capital-raised ratio is approximately 5.5 times among companies with disclosed funding, suggesting that investors assign significant value to technology, project pipelines and future carbon-credit capacity.
CREW Carbon has a valuation midpoint near $125M against only $5M of disclosed funding, producing a 25 times valuation-to-funding ratio, the highest among funded companies in the ranking.
Ocean carbon removal remains smaller than leading biomass and biochar categories. Captura, Ebb Carbon and Equatic combine for roughly $300M in midpoint valuation from approximately $93M of disclosed funding.
Novocarbo and Applied Carbon together reach approximately $310M in midpoint valuation from $49M of disclosed capital, showing the investor appeal of deployable biochar production infrastructure.
Greenlyte Carbon Technologies and Equatic combine carbon removal with hydrogen production. The two companies have a combined midpoint valuation near $180M against only $32M of disclosed funding.

A few word about our methodology

As you can see, we built a database that ranks startups in the carbon removal market based on their current valuation.

Estimating carbon removal startup valuations is not always straightforward. Many companies do not publicly disclose their valuation, and the available information can vary widely depending on the company, technology and development stage.

To build this ranking, we applied a structured valuation methodology and cross-checked information across multiple reliable sources.

Whenever possible, we relied on direct disclosures. These include announced valuations from completed funding rounds, public filings for listed companies, or official acquisition prices.

When a carbon removal company is publicly listed, we use its current market capitalization as the reference valuation.

If a carbon removal company was acquired and no independent valuation can reasonably be estimated today, we use the acquisition price as the main reference point.

When a startup recently raised capital but the valuation was not disclosed, we estimate the implied valuation using typical dilution levels for that stage of fundraising.

In some cases, we also estimate valuations using operating metrics such as revenue, annual recurring revenue, contracted carbon removal volume, project capacity or customer traction. We combine these metrics with valuation multiples from comparable carbon removal companies.

When direct financial data is not available, we may rely on carefully selected comparable startups and other signals such as hiring growth, investor quality, project development, carbon-credit purchases or technology deployment.

All estimates follow a strict evidence hierarchy. Recent funding rounds with announced valuations carry the most weight, followed by strong operating metrics and comparable company analysis.

We also carefully evaluate the age of every data point. Recent information carries more weight, while older data is treated cautiously and adjusted conservatively when necessary.

Whenever information is uncertain or incomplete, we clearly distinguish between confirmed facts and reasonable inferences.

Because carbon removal valuation data is not always fully public, each startup in the ranking is assigned a confidence level based on the reliability, recency and consistency of the available evidence.

Full confidence means the valuation is supported by strong and recent evidence. Strong confidence means the estimate is well supported but includes minor inference. Partial confidence means the estimate relies more heavily on indirect signals. Low confidence means available information is limited or inconsistent.

When confidence is lower, we take a more conservative approach by widening the valuation range. This helps reflect the uncertainty and increases the probability that the true valuation falls within the estimated range.

This reflects how we conduct all our research, including the work behind our report covering the carbon removal market.

In a world where LLMs hallucinate and unreliable information is everywhere, our goal is simple: provide data you can trust.

If you want the full detail on a specific valuation estimate, feel free to contact us and we will gladly explain.

Finally, know that we update the dataset once per month, so come back here if you need fresh information.

Related blog posts

- The main fundraising trends in the carbon removal market

- The startups that have raised the most funding in the carbon removal market

- How healthy is startup funding in the carbon removal market right now?

- All the funding deals in the carbon removal market

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