Top Climate tech companies

Companies decarbonising power, transport, agriculture, and industry.

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Ranked by current headcount across the largest Climate tech companies. Refreshed monthly.

1
EDF· Paris, Île-de-France, France
Our raison d'être is to build a net zero energy future with electricity and innovative solutions and services, to help save the planet and drive wellbeing and economic development.
- Debt
- 93.9k employees
- Founded 1946
2
ENGIE· France
What if your next career adventure started with ENGIE?Joining ENGIE means being part of a company at the forefront of the energy transition, committed to accelerating the shift to a carbon-neutral economy. With 98,000 employees across 30 countries, ENGIE's operations cover the entire energy value chain, from production to infrastructures and sales. ENGIE works across a range of complementary areas: renewable electricity and green gas production, flexibility assets (notably batteries), gas and electricity transmission and distribution networks, local energy infrastructures (heating and cooling networks) and energy supply to individuals, local authorities and businesses. #WithENGIE
- Post-IPO equity
- 72.2k employees
3
Bureau Veritas· Courbevoie, Île-de-France, France
Bureau Veritas is a world leader in Testing, Inspection and Certification. Our mission is at the heart of key challenges: quality, health and safety, environmental protection and social responsibility. Through our wide range of expertise, impartiality and independence, we foster confidence between companies, public authorities and clients.Bureau Veritas is a Business to Business to Society company, contributing to transform the world we live in. Driven by society, we are working ever more closely with our clients, addressing today’s crucial challenges and answering society’s aspirations. Bureau Veritas is listed on the Euronext Paris (Compartment A, code ISIN FR 0006174348, stock symbol: BVI).
- 59.6k employees
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4
Veolia· Aubervilliers, Île-de-France, France
Veolia, a global leader in environmental services, works every day to build environmental security for the benefit of public health and the competitiveness of industries and regions. With 215,000 employees across five continents, working closely with local communities, and thanks to its cutting-edge technologies, the group cleans up pollution, reduces carbon emissions, and regenerates resources through concrete solutions that combine its expertise in water and water technologies, waste - including hazardous waste management, and local energy. In 2025, the Veolia group served 110 million people with drinking water and 97 million with sanitation, produced 45 million megawatt hours of energy, and treated 64 million tons of waste. Veolia Environnement (Paris Euronext: VIE, Fortune 500, SBF 120) generated consolidated revenue of €44.4 billion in 2025. www.veolia.com.
- Post-IPO debt
- 50.2k employees
5
WM· Houston, Texas, United States
WM is North America's leading provider of integrated environmental solutions. We partner with our customers and communities to manage and reduce waste from collection to disposal while recovering valuable resources and creating clean, renewable energy. We are on a quest for environmental performance, a mission to maximize resource value, while minimizing – and even eliminating – environmental impact so that both our economy and our environment can thrive. WM tailors its services to meet the needs of each customer group and to ensure consistent, superior service at the local level. Headquartered in Houston, the company serves nearly 20 million municipal, commercial, industrial, and residential customers through a network of 367 collection operations, 355 transfer stations, 273 active landfill disposal sites, 16 waste-to-energy plants, 104 recycling plants, and 111 beneficial-use landfill gas projects.
- Post-IPO debt
- 29k employees
- Founded 1968

6
Iberdrola· Bilbao, Basque Country, Spain
With more than 180 years of history, Iberdrola is today a global energy leader, the leading wind power producer and one of the largest electricity companies in the world in terms of stock market capitalisation.We have been committed to clean energy for more than 20 years with the objective of exceeding 52,000 MW of renewable capacity by 2025. The group supplies energy to nearly 100 million people in dozens of countries, has more than 600,000 shareholders, a workforce of more than 42,300 employees.We are leading the energy transition to a sustainable model through our investments in renewables, smart grids, large-scale energy storage and digital transformation to deliver the most advanced products and services to our customers.Find out more in 'Life at Iberdrola'
- Post-IPO debt
- 27k employees
- Founded 1901
7
SUEZ· Labretonie, Nouvelle-Aquitaine, France
We provide essential services in the water and waste sectors to preserve resources and improve quality of life wherever we operate. As a global player for over 160 years, we support public and private actors with resilient and innovative solutions. With a presence in over 40 countries and 40,000 employees, we provide drinking water and sanitation services to millions of people. We operate across the whole water and waste supply chain, from infrastructure design to sustainable resource management. Given the environmental challenges we face, we rely on the potential of digital technologies to help our clients reduce their environmental impact and improve the performance of their water and waste services.
- Post-IPO debt
- 26.5k employees
- Founded 2008
8
Republic Services· Phoenix, Arizona, United States
Republic Services provides the most complete set of recycling, waste and environmental solutions from a single provider. Through our industry-leading commitments and initiatives, we’re advancing circularity and decarbonization efforts, delivering on our vision of partnering with customers to create a more sustainable world. #SustainabilityinAction Republic Services LinkedIn User Terms of UseThe Republic Services LinkedIn page is intended to provide a forum for customers, community members, employees, and others to discuss Republic Services’ products and services. Comments and other user content do not reflect the views, opinions, or positions of Republic Services, its employees, representatives, or affiliates. Republic Services is not responsible for any user content, does not represent or warrant the accuracy of any user content, including service and product claims, and does not endorse any opinions expressed on this page. All users must comply with LinkedIn’s Terms of Use, LinkedIn’s Community Guidelines, and these Republic Services LinkedIn User Terms of Use. Republic Services reserves the right to delete or hide user comments or other content that it deems is harassing, offensive, misinformed, derogatory, hateful, or is otherwise inappropriate, fails to productively contribute to the purpose of the page, and/or violates LinkedIn’s Terms of Use or Community Guidelines and may block users for repeated or egregious violations of these guidelines.
- 21.3k employees
- Founded 1998
9
Siemens Gamesa· Zamudio, Basque Country, Spain
Siemens Gamesa is a global technology leader in the renewable energy industry - specifically in the development, manufacturing, installation and maintenance of wind turbines. Being a pioneer in renewables since the 1980s, we put our scale and entrepreneurial culture to work on driving the energy transition towards a sustainable world. We empower our customers, people, and partners to lead the future with green energy.Siemens Gamesa is a trademark licensed by Siemens AG.
- Debt
- 19.5k employees
- Founded 2017
10
Team for the Planet· Lyon, Auvergne-Rhône-Alpes, France
Entrepreneurship in the service of the climate emergency! We identify, fund, and launch 100 companies designed and structured from start to finish to combat greenhouse gases.Our mission:> identify high-impact innovations;> recruit experienced entrepreneurs to transform these innovations into companies with solid business models;> inject financial resources to maximize and accelerate deployment.All innovations are made available as open source.Every euro raised is used to combat climate change.Any individual or organization can join the effort starting at €1 on our website (in just a few minutes) and take concrete action, on a global scale, against climate change.Everything is detailed (and you can contact us) at team-planet.com
- Pre-seed
- 18.7k employees
- Founded 2019

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Find engineers and designers at top Climate tech companies

The Climate tech industry runs on the people who build it. The list above ranks the largest Climate tech companies by current headcount, drawn from public LinkedIn and Crunchbase records. Across the 22,981 Climate tech companies in Refolk’s index, you’ll find software engineers, ML researchers, designers, founders, and recruiters worth talking to - whether you’re hiring, investing, or doing market research.

Each company on the list is a hub of talent. The biggest Climate tech companies tend to attract specialised engineers, while younger ones run on small founding teams and hire generalists. Looking at headcount, last funding round, and HQ location side by side gives you a quick read on where the talent density is highest.

Refolk turns this list into a search. Ask for “Climate tech engineers in San Francisco hiring senior ML” or “designers at Climate tech companies who shipped a product in 2025” and Refolk returns a fresh ranked shortlist with the sources that earned each person a spot.

How this list is built

Refolk pulled the largest companies in Climate tech from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes monthly.

Last refreshed: Thu, 17 Sep 2026 06:05:16 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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