Top Climate tech companies in London

SLR is a committed partner in our clients’ sustainability journeys.We help them move from influence to impact, turning intent into purposeful, practical action that delivers real-world results.Guided by our philosophy of Rational Sustainability, we focus on what truly drives long-term value. By viewing decisions through the lenses of risk, reward, and resilience, we help clients act with confidence, balancing environmental and social responsibility with commercial and strategic success.Our purpose - Making Sustainability Happen - means delivering outcomes that are grounded in evidence, shaped by experience, and built to last.SLR has been advising clients for over 30 years at every point of their project life-cycle. Starting as a UK business, we now operate as a global company with more than 4,500 people delivering client solutions across six regions. We have grown both organically and through welcoming other like-minded businesses with a similar One Team culture into the SLR group. We are ably supported by our principal investor, Ares Management, and will continue to build a balanced, successful and growing business.We’ve designed working life at SLR to look a little different. Because we know talented people often feel restricted by the rigid systems, lack of cross-functional collaboration and limited options for growth on offer elsewhere.Our One Team culture promotes meaningful professional and personal growth, our flat management structure provides many opportunities to progress, and our collaborative approach means you’ll get the chance to work on projects you care about and make a real difference.If you’re purpose-driven, self-motivated and keen to make an impact on a global scale, we want to hear from you.

• Series C
• 4.4k employees
• Founded 1994

In the UK & Ireland, Equans is a provider of sustainable facilities management and regeneration, and cutting-edge energy and digital services. Our 15,000 employees combine these activities to deliver decarbonisation across the built environment and help businesses, communities, public sector organisations and government to accelerate the transition to a low carbon, resilient world.Globally, Equans is a world leader in the energy and services sector with operations in 20 countries, 90,000 employees working on 5 continents and a turnover of 19.2 billion euros in 2024. Equans is a subsidiary of the Bouygues group.

• Grant
• 2.3k employees

We are the World’s leading provider of chemical cleaning & environmental solutions offering a wide range of solutions to address the needs of our diverse customer base. Each of our products has been developed to augment our customer’s productivity, quality and compliance utilising all of the experience gained since our arrival into Europe in 1973.Safetykleen’s unique service offer combines parts washer machines, scheduled services, speciality chemicals, and industrial and waste oil collection, all of which ensure the total peace of mind that comes as standard for Safetykleen customers.As a specialist mechanical parts cleaning organisation, our products productively ensure that your goods and services run smoothly and economically. We've developed many cleaning strategies to fit a diverse range of products. We are a first choice cleaning service that will optimise your business performance.We ensure all of the above is maintained while looking after the environment. Sustainability is of the highest priority for us because we believe demand for green products is high and still increasing.

• 1.5k employees
• Founded 1973

As the founder of environmental reporting, we believe in transparency and the power of data to drive change. Partnering with leaders in enterprise, capital, policy and science, we surface the information needed to enable Earth-positive decisions. We supported more than 22,100 companies and over 1,000 cities, states and regions disclose their environmental impacts in 2025. Financial institutions with more than a quarter of the world’s institutional assets use CDP data to help inform investment and lending decisions. Our team is truly global, united by our shared desire to build a world where people, planet and profit are truly balanced. To meet the scale and speed of today’s environmental challenges and market expectations, CDP is becoming two separate organizations – a commercial entity, CDP, and a non-profit CDP Foundation. They will be united in shared ambition: to surface new information, enabling Earth-positive decisions to protect future generations. More information to follow.

• Grant
• 1.2k employees
• Founded 2000

Anthesis guides clients to sustainable performance. We are the world’s leading purpose driven, digitally enabled, science-based activator.From the Greek word ‘anthesis’, referencing the lifecycle stage of a plant when it is most productive, Anthesis exists to guide our clients as they transition to decarbonised and more sustainable futures.With world-class expertise in science-based advisory, market-leading digital solutions, the development of high-quality carbon removal projects and purpose consulting, strategy and communication, Anthesis is uniquely positioned to manage risk and find value for our clients in their transformation journeys.

• Private equity
• 924 employees
• Founded 2013