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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 monthly.

  1. 1
    Recology· San Francisco, California, United States

    At Recology, you’ll join a team of passionate, creative, and dedicated individuals who are leaders in sustainability. As the only 100% employee-owned company in the waste and recycling industry, our employee stock ownership plan (ESOP) ensures that our company remains in the hands of our employee-owners, not external stakeholders. This means that every team member has a stake in our success and shares in the rewards of our collective efforts. Founded by immigrants in early 1900s San Francisco, Recology started with the vision of seeing value in what others discarded. Today, we continue this mission with over 3,700 employee-owners serving more than one million customers across California, Oregon, and Washington. Our services include residential and commercial waste collection and recycling, curbside composting, construction and demolition debris recycling, and more. Each service is designed to keep our communities clean and materials out of the landfills. Where some see waste, we see resources. Join us at Recology, where you’ll help customers divert waste from landfills, embrace sustainable practices, and contribute to a future without waste. See our social media community guidelines: linktr.ee/recology

    • 1.3k employees
    • Founded 1920
  2. 2
    d.light· San Francisco, California, United States

    d.light is a global leader and pioneer in delivering affordable solar-powered solutions designed for the two billion people in the developing world without access to reliable energy. d.light provides distributed solar energy solutions for households and small businesses that are transforming the way people all over the world use and pay for energy. d.light is dedicated to providing the most reliable, affordable and accessible solar lighting and power systems for the developing world and impacting 100 million lives by 2020.Find out more at www.dlight.com

    • Debt
    • 1.1k employees
    • Founded 2007
  3. 3
    SCS Global Services· San Francisco, California, United States

    Scientific Certification Systems, Inc., now doing business as SCS Global Services, is a trusted leader in third-party environmental, sustainability and food quality certification, auditing, testing and standards development.We partner with companies, government agencies, and stakeholders worldwide to identify and drive practices, policies and processes that advance the goals of sustainable development and give innovators a competitive advantage. Working with capable leaders across the forestry, green building, energy, agricultural, fisheries, and consumer products sectors, we proudly provide services in every corner of the earth. These services are enabling policy-makers, procurement officers, company decision-makers and consumers to make informed decisions based on the highest level of environmental, ethical and quality accountability.We also play a leading role in driving the development of national and international leadership standards to create a framework for continuous improvement.

    • 790 employees
    • Founded 1984
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  5. 4
    Environmental Science Associates· San Francisco, California, United States

    ESA is a 100% employee-owned environmental consulting firm. We plan, design, permit, mitigate, and restore—for projects across our communities, infrastructure systems, open spaces, and wildlands. We are 50 years strong in 21 offices across California, the Pacific Northwest, and the Southeastern United States.Specializing in community and airport planning, environmental planning, analysis and assessment, natural and cultural resources management, environmental restoration and design, and regulatory compliance—ESA scientists, planners, historians, archaeologists, engineers, designers, and technical specialists provide critical thinking, in-depth analyses, and committed follow-through to guide successful policy development and project planning, and deliver enduring multi-objective solutions.

    • 742 employees
    • Founded 1969
  6. 5
    AMS· San Francisco, California, United States

    AMS is now part of Fluence. We’re accelerating our cutting-edge digital products by joining energy storage leader Fluence.

    • 622 employees
    • Founded 2013

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 128 matching companies in Refolk’s index, this is a good map of where the Climate tech talent in San Francisco lives - 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 Francisco hiring senior staff” or “founders of Climate tech companies in San Francisco who 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 monthly.

Last refreshed: Wed, 04 Nov 2026 04:30:51 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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The underlying index updates continuously and this ranking is rebuilt monthly. Last refreshed: Wed, 04 Nov 2026 04:30:51 GMT. For a list built against the index as it stands today, sign up and run the search live.

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