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Top Climate tech companies in San Francisco

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

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

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

  1. 1
    Recology· San Francisco, California, United States
    • 1.3k employees
    • Founded 1920
  2. 2
    d.light· San Francisco, California, United States
    • Debt
    • 1.1k employees
    • Founded 2007
  3. 3
    Environmental Science Associates· San Francisco, California, United States
    • 747 employees
    • Founded 1969
  4. 4
    AMS· San Francisco, California, United States
    • 627 employees
    • Founded 2013
  5. 5
    Bay Area Air District· San Francisco, California, United States
    • Grant
    • 469 employees
    • Founded 1955
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Find engineers at Climate tech companies in San Francisco

San Francisco 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 102 matching companies in our index, this is a good map of where the Climate tech talent in San Franciscolives - useful whether you’re recruiting, partnering, or sizing a market.

The biggest Climate tech companies in San Francisco 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 San Franciscohiring senior staff” or “founders of Climate tech companies in San Franciscowho 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 San Francisco 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 13:41:29 GMT

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