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Top Series A AI companies

Companies building AI products, foundation models, and applied ML platforms. Filtered to companies whose latest disclosed round is Series A.

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Built from a search like: Top Series A AI companies

Ranked by current headcount across Series A AI companies. Refreshed monthly.

  1. 1
    Google DeepMind· London, England, United Kingdom

    We’re a team of scientists, engineers, machine learning experts and more, working together to advance the state of the art in artificial intelligence. We use our technologies for widespread public benefit and scientific discovery, and collaborate with others on critical challenges, ensuring safety and ethics are the highest priority.Our long term aim is to solve intelligence, developing more general and capable problem-solving systems, known as artificial general intelligence (AGI). Guided by safety and ethics, this invention could help society find answers to some of the world’s most pressing and fundamental scientific challenges. We have a track record of breakthroughs in fundamental AI research, published in journals like Nature, Science, and more.Our programs have learned to diagnose eye diseases as effectively as the world’s top doctors, to save 30% of the energy used to keep data centres cool, and to predict the complex 3D shapes of proteins - which could one day transform how drugs are invented.

    • Series A
    • 10.4k employees
    • Founded 2010
  2. 2
    LLLL· Shawnee, Kansas, United States

    LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL

    • Series A
    • 490 employees
    • Founded 2010
  3. 3
    Lab of Mediate Energy Physics and Nuclear Technology· China

    Research on mediate energy physics and nuclear technology

    • Series A
    • 260 employees
    • Founded 2025
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  5. 4
    Redrob· San Francisco, California, United States

    Redrob - 'border' in reverse - is building LLMs for the next 3 billion. Purpose-built for sales, recruitment, and jobs. Series A funded with $14M. Backed by world-class VCs.

    • Series A
    • 218 employees
    • Founded 2018
  6. 5
    RISA· Palo Alto, California, United States

    Making Patients Win, starting in oncology.

    • Series A
    • 211 employees
    • Founded 2024

Find engineers and founders at Series A AI companies

Series A AI companies are some of the most active hirers in the market. The list above ranks the largest AI companies whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. Across 114 matching companies, you’ll find senior engineers, founding designers, and operators worth tracking.

Companies at this stage in AI share a profile: a working product, fresh capital, and a hiring plan that wants senior people yesterday. Looking at headcount, last round, and HQ side by side gives you a quick read on where AI talent is concentrating right now.

Refolk converts this list into a search. Ask for Series A AI founders hiring senior engineers” or “design leads at Series A AI companies” and Refolk returns a fresh ranked shortlist with the sources behind each match.

How this list is built

Refolk pulled AI companies 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 5 employees. The list refreshes monthly.

Last refreshed: Fri, 18 Sep 2026 07:43:19 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: Fri, 18 Sep 2026 07:43:19 GMT. For a list built against the index as it stands today, sign up and run the search live.

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