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Top Climate tech companies in London

Companies decarbonising power, transport, agriculture, and industry. Filtered to companies headquartered in London.

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

Ranked by current headcount across Climate tech companies headquartered in London. Refreshed daily.

  1. 1
    SLR Consulting· London, England, United Kingdom
    • Series C
    • 4.3k employees
    • Founded 1994
  2. 2
    Equans UK & Ireland· London, England, United Kingdom
    • Grant
    • 2.3k employees
  3. 3
    Safetykleen· Brentford, England, United Kingdom
    • 1.5k employees
    • Founded 1973
  4. 4
    CDP· London, England, United Kingdom
    • Grant
    • 1.2k employees
    • Founded 2000
  5. 5
    Anthesis Group· London, England, United Kingdom
    • Private equity
    • 915 employees
    • Founded 2013
Reveal 437 more·100 free credits, no card

Find engineers at Climate tech companies in London

London has long been a hub for Climate tech, and the list above ranks the largest Climate tech companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 442 matching companies in our index, this is a good map of where the Climate tech talent in Londonlives - useful whether you’re recruiting, partnering, or sizing a market.

The biggest Climate tech companies in London tend to be the gravitational centres for specialised talent - senior engineers, ML researchers, applied scientists, designers - while the smaller ones compete on speed, equity, and proximity to founders.

Refolk converts this list into a live search. Ask for “Climate tech engineers in Londonhiring senior staff” or “founders of Climate tech companies in Londonwho left in the last 12 months” and Refolk returns a ranked shortlist with the evidence that earned each person a spot.

How this list is built

Refolk pulled Climate tech companies headquartered in London from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 10 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 14:04:21 GMT

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