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Series A Climate tech companies in London

Companies decarbonising power, transport, agriculture, and industry. Filtered to Series A-stage companies headquartered in London.

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Built from a search like: “Top Series A Climate tech companies in London”

Ranked by current headcount across Series A Climate tech companies in London. Refreshed monthly.

  1. 1
    44.01· London, England, United Kingdom

    We eliminate CO2 by turning it into rock using the natural power of mineralisation.

    • Series A
    • 177 employees
    • Founded 2020
  2. 2
    Revalue· London, England, United Kingdom

    Revalue creates radically better nature-based carbon credits that avoid, remove, and durably store CO2. Backed by a multidisciplinary team of 40+ experts with experience across 15 countries, our team has already helped mobilise $170M into nature-based climate solutions.By combining cutting-edge science, advanced technology, and deep local partnerships, Revalue delivers a next generation of carbon credits with greater scientific rigour. Our proprietary platform, Verse, ensures rigorous assessment, monitoring, and transparency across landscapes and natural ecosystems globally.Learn more at www.revalue.earth.

    • Series A
    • 61 employees
    • Founded 2022
  3. 3
    Airly· London, England, United Kingdom

    We are Airly. Our mission is to empower the world to reduce air pollution - to save lives.This means transforming how governments, businesses and communities understand and respond to air pollution. Today we’re focussed on building more granular, actionable and cost-effective information on air quality - through an end-to-end air quality monitoring solution to supplement existing regulatory monitors.Visit the Airly map (https://map.airly.org/) or download the Airly mobile app (https://airpollutionalert.com/) to check the current air quality in your area

    • Series A
    • 44 employees
    • Founded 2016
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  5. 4
    Puraffinity· London, England, United Kingdom

    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
  6. 5
    Gaussion· London, England, United Kingdom

    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

Find engineers at Series A Climate tech companies in London

Searching for “engineers at top Series A Climate tech companies in London” surfaces this slice of the market. The list above ranks Climate tech companies headquartered in London whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. With 5 matching companies in Refolk’s index, this is a tight read on where the Climate tech talent in London is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series A, Climate tech, in London - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Climate tech’s next operators and angel investors.

Refolk converts this list into a live search. Ask for “senior engineers at Series A Climate tech companies in London hiring” or “founders of Series A Climate tech companies in London who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled Climate tech companies headquartered in London whose latest disclosed funding round is Series A from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes monthly.

Last refreshed: Mon, 19 Oct 2026 20:46:16 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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