Company lists · Data refreshed September 2026

Top 25 Climate tech startups worldwide

Name: Climate tech startups worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 4,403 companies tracked

RevenueBase identified 4,403 climate tech startups worldwide as of September 2026 and tracks 199,420 professional contacts across them, including 60,266 with verified work emails. The United States is the largest market and London the largest hub.

This list covers climate tech startups worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026. Country and city lists for climate tech startups follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

4,403Companies

199,420Contacts tracked

60,266Verified emails

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The 25 largest climate tech startups worldwide

Ranked by team size

Top 25 of 4,403 climate tech startups worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to climate tech startups: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Exxonmobil	Indirect evidence	Spring, United StatesHQ checked Sep 19, 2026	n/a	54,082 contacts →
	Indirect evidence “The need for energy is universal.” Source: RevenueBase Database · checked Sep 19, 2026
2	Team For The Planet	Partial evidence	Lyon, FranceHQ checked Sep 19, 2026	n/a	16,533 contacts →
	Partial evidence “Entrepreneurship in the service of the climate emergency!” Source: RevenueBase Database · checked Sep 19, 2026
3	Trane Technologies	Partial evidence	Davidson, NC, United StatesHQ checked Sep 19, 2026	10001+	12,878 contacts →
	Partial evidence “Trane Technologies is a global climate innovator advancing sustainability through our leading brands Trane® and Thermo King®, which bring efficient and sustainable climate…” Source: RevenueBase Database · checked Sep 19, 2026
4	Subsea7	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	10001+	12,645 contacts →
	Indirect evidence “Subsea7 makes offshore energy transition possible through the continuous evolution of lower-carbon oil and gas and by enabling the growth of renewables and emerging energy.” Source: RevenueBase Database · checked Sep 19, 2026
5	Carrier Hvac	Partial evidence	United StatesHQ checked Sep 19, 2026	10001+	10,099 contacts →
	Partial evidence “Carrier is a global leader in intelligent climate and energy solutions, pioneering sustainable innovations in climate technologies.” Source: RevenueBase Database · checked Sep 19, 2026
6	Dalkia	Partial evidence	Saint-andré-lez-lille, FranceHQ checked Sep 19, 2026	10001+	8,427 contacts →
	Partial evidence “Dalkia : ensemble, relevons le défi climatique!” Source: RevenueBase Database · checked Sep 19, 2026
7	Johnson Matthey	Indirect evidence	London, ItalyHQ checked Sep 19, 2026	5,001-10,000	8,053 contacts →
	Indirect evidence “Johnson Matthey (JM) is a world leader in platinum group metals (PGMs).” Source: RevenueBase Database · checked Sep 19, 2026
8	RENEW	Indirect evidence	Gurugram, IndiaHQ checked Sep 19, 2026	1,001-5,000	4,340 contacts →
	Indirect evidence “ReNew is a leading decarbonisation solutions provider and the first Indian clean energy company to list on Nasdaq (Nasdaq: RNW).” Source: RevenueBase Database · checked Sep 19, 2026
9	Topsoe	Indirect evidence	Kongens Lyngby, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,616 contacts →
	Indirect evidence “Topsoe is a leading global provider of technology and solutions for the energy transition.” Source: RevenueBase Database · checked Sep 19, 2026
10	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 19, 2026
11	Clearesult	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,121 contacts →
	Indirect evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Sep 19, 2026
12	Envision Energy	Indirect evidence	Huangpu District, ChinaHQ checked Sep 19, 2026	1,001-5,000	1,961 contacts →
	Indirect evidence “Envision Energy is a world-leading green technology company that provides renewable energy solutions for global enterprises, governments, and institutions.” Source: RevenueBase Database · checked Sep 19, 2026
13	Ameresco	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,383 contacts →
	Indirect evidence “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Source: RevenueBase Database · checked Sep 19, 2026
14	California Resources Corporation	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,095 contacts →
	Indirect evidence “California Resources Corporation (CRC) is an independent energy and carbon management company committed to energy transition.” Source: RevenueBase Database · checked Sep 19, 2026
15	Gruppo AB	Indirect evidence	Orzinuovi, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,081 contacts →
	Indirect evidence “Since 1981, AB has tackled the challenges posed by energy sustainability, working alongside our customers to improve their competitiveness while saving energy and reducing…” Source: RevenueBase Database · checked Sep 19, 2026
16	Anthesis Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	894 contacts →
	Indirect evidence “Anthesis guides clients to sustainable performance.” Source: RevenueBase Database · checked Sep 19, 2026
17	South Pole	Partial evidence	Zurich, SwitzerlandHQ checked Sep 19, 2026	501-1,000	811 contacts →
	Partial evidence “South Pole is the world's leading carbon asset developer and climate consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
18	Energy Solutions	Partial evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	201-500	772 contacts →
	Partial evidence “Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.” Source: RevenueBase Database · checked Sep 19, 2026
19	Resource Innovations	Indirect evidence	Half Moon Bay, CA, United StatesHQ checked Sep 19, 2026	501-1,000	733 contacts →
	Indirect evidence “Resource Innovations (RI) is an energy transformation firm.” Source: RevenueBase Database · checked Sep 19, 2026
20	KBC A Yokogawa Company	Indirect evidence	Walton-on-thames, United KingdomHQ checked Sep 19, 2026	201-500	658 contacts →
	Indirect evidence “We are passionate about driving sustainable change for our planet.” Source: RevenueBase Database · checked Sep 19, 2026
21	ACT Group	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	501-1,000	556 contacts →
	Indirect evidence “As the leading environmental solutions partner for organizations globally, ACT helps its partners meet increasing environmental action and disclosure expectations from regulators…” Source: RevenueBase Database · checked Sep 19, 2026
22	GTI Energy	Indirect evidence	Des Plaines, IL, United StatesHQ checked Sep 19, 2026	201-500	513 contacts →
	Indirect evidence “For more than eight decades, GTI Energy has contributed to the strengthening of energy systems and the communities they serve.” Source: RevenueBase Database · checked Sep 19, 2026
23	STX Group	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	501-1,000	502 contacts →
	Partial evidence “STX Group is a leading global firm in environmental commodities trading and climate finance.” Source: RevenueBase Database · checked Sep 19, 2026
24	Altus Intervention	Indirect evidence	Stavanger, NorwayHQ checked Sep 19, 2026	1,001-5,000	485 contacts →
	Indirect evidence “In 2023 Baker Hughes completed the acquisition of Altus Intervention.” Source: RevenueBase Database · checked Sep 19, 2026
25	Chakr Innovation	Partial evidence	Gurugram, IndiaHQ checked Sep 19, 2026	501-1,000	476 contacts →
	Partial evidence “Chakr Innovation is a pioneering Indian cleantech startup, founded by IIT Delhi graduates, dedicated to revolutionizing air quality with cutting-edge material science technology.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: climate tech startups. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names climate tech startups.
Partial evidence: Its own public description names part of climate tech startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate tech startups. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 4,403 climate tech startups worldwide

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Climate tech startups worldwide at a glance

As of Sep 19, 2026

30.2%Verified-email coverage

45.3Average contacts per company

1-10Median size (employees)

3.9%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

2,643

11-50

1,315

51-200

305

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among climate tech startups, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for climate tech startups are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “climate tech startups”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names climate tech startups), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among climate tech startups, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 60,266 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Climate tech startups by location

28 lists · largest first

Every Climate tech startups list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names climate tech startups, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many climate tech startups are there worldwide?

RevenueBase identified 4,403 climate tech startups worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Exxonmobil, headquartered in Prague, tops this list with the largest team on record.

Which country has the most climate tech startups?

The United States leads with 745 companies, followed by India (350) and the United Kingdom (347). Every climate tech startups list by country and city is linked on this page.

Which city has the most climate tech startups?

London leads with 171 headquartered companies, followed by Singapore (60) and New York (51).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 60,266 verified decision-maker contacts tracked across these 4,403 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.