Series A Climate tech companies in London

Puraffinity specialises in designing and manufacturing novel advanced materials for environmental benefit, such as removing harmful pollutants from water and wastewater. Focusing initially on PFAS removal, Puraffinity has developed an innovative adsorbent media allowing an easily deployable solution for addressing PFAS compliance. In addition, the solution is highly cost effective, providing an attractive Return On Investment for customers, and reduced life-cycle costs.Founded in 2015, Puraffinity is backed by leading sustainability investors Kindred Capital, Heritage Group Ventures as well as Octopus Ventures and BGF (Business Growth Fund) and more.Puraffinity combines chemistry and material engineering expertise to architect molecular structures that exhibit a high affinity towards target compounds and can bind them effectively. The result is a new class of targeted adsorbent media that selectively captures emerging contaminants such as PFAS. The technology we develop can be used for PFAS treatment in different applications and water matrices which cover a variety of markets such as Point of Use, municipal potable water, groundwater remediation, industrial manufacturing, airport/military bases, oil and gas. By harnessing multidisciplinary approaches and scientific principles, our mission is to create sustainable environmental solutions for tackling some of the world’s most pressing challenges. To find out more, please visit www.puraffinity.com.

• Series A
• 42 employees
• Founded 2015

Natcap is the world's leading nature intelligence provider, helping global companies measure, report, and act on nature and biodiversity risks and opportunities. Our science-based software and advisory services unlock supply chain resilience, ensure regulatory compliance, and drive sustainable growth. Founded in 2018 by leading scientists at the University of Oxford, Natcap combines scientific rigour with practical solutions to help companies make the business case for nature, quantify the value at stake, and integrate nature into business strategy.

• Series A
• 41 employees
• Founded 2018

AirEx is a rapidly growing climate tech company with the mission to tackle climate change and fuel poverty. We design, develop, and manufacture smart home solutions helping householders reduce their energy bills whilst managing air quality. AirEx has developed a retrofit smart ventilation control system that regulates the airflow via air-bricks. Occupants benefit from significantly reduced energy bills, improved thermal comfort, without compromising on air quality.

• Series A
• 36 employees
• Founded 2016

Gaussion creates energy intelligence - the intelligent control layer inside every battery pack.A UK deep tech company spun out from UCL in 2022.Our magnetic chips retrofit into existing battery systems without changing cells, chemistry, or supply chains. The result: longer cycle life, better cold weather performance, and real-time data from inside the pack.

• Series A
• 25 employees
• Founded 2017

In the next 40 years, we’re set to double the amount of infrastructure in the world — equivalent to a new Manhattan every month. A lot of this is crucial to the energy transition, but all of it will require steel and cement. These two materials represent 15% of global emissions. We’re committed to tackling the climate emergency by decarbonising heavy industries and creating low-carbon construction materials. Our patent-pending process captures CO2 and upcycles by-products from steel manufacturing into a cement alternative. We’re a small, but mighty team (and growing), backed by world-class investors in climate, hardware and industrial decarbonisation.

• Series A
• 21 employees
• Founded 2023