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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 daily.

  1. 1
    Genentech· South San Francisco, California, United States
    • Series A
    • 18.2k employees
    • Founded 1976
  2. 2
    Google DeepMind· London, England, United Kingdom
    • Series A
    • 9.5k employees
    • Founded 2010
  3. 3
    Esco· Singapore, Singapore
    • Series A
    • 1.3k employees
    • Founded 1978
  4. 4
    ISQ· Oeiras, Lisbon, Portugal
    • Series A
    • 1.2k employees
    • Founded 1965
  5. 5
    Rentschler Biopharma· Laupheim, Baden-Württemberg, Germany
    • Series A
    • 901 employees
    • Founded 1927
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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 865matching 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 once a day.

Last refreshed: Sun, 21 Jun 2026 10:37:18 GMT

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