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.
- StageSeries A
- IndustryAI
- Matches853
Built from a search like: “Top Series A AI companies”
Ranked by current headcount across Series A AI companies. Refreshed daily.
- 1Genentech· South San Francisco, California, United States
- Series A
- 18.1k employees
- Founded 1976
- 2Google DeepMind· London, England, United Kingdom
- Series A
- 8.3k employees
- Founded 2010
- 3Esco· Singapore, Singapore
- Series A
- 1.3k employees
- Founded 1978
- 4ISQ· Oeiras, Lisbon, Portugal
- Series A
- 1.2k employees
- Founded 1965
- 5MedImmune· Gaithersburg, Maryland, United States
- Series A
- 906 employees
- Founded 1987
- 6Rentschler Biopharma· Laupheim, Baden-Württemberg, Germany
- Series A
- 898 employees
- Founded 1927
- 7Altos Labs
- Series A
- 576 employees
- Founded 2021
- 8BlueRock Therapeutics· Cambridge, Massachusetts, United States
- Series A
- 463 employees
- Founded 2016
- 9LLLL· Shawnee, Kansas, United States
- Series A
- 459 employees
- Founded 2010
- 10Meihua Holdings Group Co., Ltd.· China
- Series A
- 441 employees
- Founded 2002
- 11Isomorphic Labs· London, England, United Kingdom
- Series A
- 348 employees
- Founded 2021
- 12GENEWIZ from Azenta Life Sciences· South Plainfield, New Jersey, United States
- Series A
- 307 employees
- Founded 2021
- 13Stylus· London, England, United Kingdom
- Series A
- 256 employees
- Founded 2010
- 14Watchmaker Genomics· Boulder, Colorado, United States
- Series A
- 236 employees
- Founded 2019
- 15Health in Code Group· Valencia, Valencian Community, Spain
- Series A
- 227 employees
- Founded 2001
- 16Vital Bio· Oakville, Ontario, Canada
- Series A
- 224 employees
- Founded 2019
- 17Andes· Alameda, California, United States
- Series A
- 219 employees
- Founded 2018
- 18ADAPT· Millers Point, New South Wales, Australia
- Series A
- 202 employees
- Founded 2011
- 19Xaira Therapeutics· South San Francisco, California, United States
- Series A
- 192 employees
- Founded 2023
- 20Partner Therapeutics· Lexington, Massachusetts, United States
- Series A
- 187 employees
- Founded 2017
- 211Cell.Ai Inc.· Mumbai, Maharashtra, India
- Series A
- 184 employees
- Founded 2021
- 22Refeyn· Oxford, England, United Kingdom
- Series A
- 177 employees
- Founded 2018
- 23Treeline· Watertown, Massachusetts, United States
- Series A
- 162 employees
- Founded 2021
- 24Hawthorne Health, Inc.· Walnut Creek, California, United States
- Series A
- 159 employees
- Founded 2015
- 25NANO· Eindhoven, North Brabant, Netherlands
- Series A
- 153 employees
- Founded 2019
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 853matching 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
Last refreshed: Thu, 07 May 2026 07:56:14 GMT
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