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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 daily.

  1. 1
    Bureau Veritas· Courbevoie, Île-de-France, France
    • 55k employees
  2. 2
    Veolia· Aubervilliers, Île-de-France, France
    • Post-IPO debt
    • 49.3k employees
  3. 3
    WM· Houston, Texas, United States
    • Post-IPO debt
    • 28.3k employees
    • Founded 1968
  4. 4
    SUEZ· Labretonie, Nouvelle-Aquitaine, France
    • 26.4k employees
    • Founded 2008
  5. 5
    Republic Services· Phoenix, Arizona, United States
    • 21k employees
    • Founded 1998
Reveal 16,589 more·100 free credits, no card

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 16,594 Climate techcompanies in our 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 techengineers in San Francisco hiring senior ML” or “designers at Climate techcompanies 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 once a day.

Last refreshed: Sun, 21 Jun 2026 08:17:45 GMT

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