Top AI companies
Companies building AI products, foundation models, and applied ML platforms.
Ranked by current headcount across the largest AI companies. Refreshed daily.
- 1Roche· Basel, Basel, Switzerland
- Post-IPO equity
- 104.1k employees
- 2Thermo Fisher Scientific· Waltham, Massachusetts, United States
- Post-IPO debt
- 99.8k employees
- Founded 1956
- 3Amgen· Thousand Oaks, California, United States
- Post-IPO debt
- 39.9k employees
- Founded 1980
- 4ICON plc· Greater Dublin
- Post-IPO debt
- 34.6k employees
- Founded 1990
- 5The National Institutes of Health· Bethesda, Maryland, United States
- Grant
- 28.8k employees
- 6Eurofins· Luxembourg, Luxembourg, Luxembourg
- Post-IPO debt
- 25.9k employees
- Founded 1987
- 7UCL· London, England, United Kingdom
- Grant
- 24.3k employees
- 8Syneos Health· Morrisville, North Carolina, United States
- Private equity
- 23.3k employees
- Founded 1985
- 9CSL· Carlton, Victoria, Australia
- Post-IPO equity
- 23.2k employees
- Founded 1916
- 10CNRS· Paris, Île-de-France, France
- 22.6k employees
- Founded 1939
- 11PPD· Waltham, Massachusetts, United States
- Private equity
- 20.9k employees
- Founded 1985
- 12King's College London· London, England, United Kingdom
- Grant
- 20.5k employees
- 13University of Cambridge· Cambridge, England, United Kingdom
- Grant
- 20.1k employees
- 14Trabalhadora autonoma· Paraíba, Brazil
- 20.1k employees
- 15CEA· Paris, Île-de-France, France
- 18.9k employees
- 16Genentech· South San Francisco, California, United States
- Series A
- 18.1k employees
- Founded 1976
- 17Imperial College London· London, England, United Kingdom
- Grant
- 17.8k employees
- Founded 1907
- 18Agilent Technologies· Santa Clara, California, United States
- Post-IPO debt
- 17.7k employees
- Founded 1999
- 19aucune/none· France
- 17.1k employees
- Founded 1992
- 20Sapienza Università di Roma· Solbiate, Lombardy, Italy
- 16.6k employees
- 21The University of Edinburgh· Edinburgh, Scotland, United Kingdom
- 16k employees
- 22KU Leuven· Leuven, Flemish Region, Belgium
- 14.9k employees
- 23Charles River Laboratories· Wilmington, Massachusetts, United States
- Grant
- 14.8k employees
- Founded 1947
- 24Gilead Sciences· San Mateo, California, United States
- Post-IPO debt
- 14.6k employees
- Founded 1987
- 25Los Alamos National Laboratory· Los Alamos, New Mexico, United States
- Grant
- 13.2k employees
- Founded 1943
Find engineers and designers at top AI companies
The AI industry runs on the people who build it. The list above ranks the largest AI companies by current headcount, drawn from public LinkedIn and Crunchbase records. Across the 17,912 AIcompanies in our index, you’ll find software engineers, ML researchers, designers, founders, and recruiters worth talking to — whether you’re hiring, investing, or doing market research.
Each company on the list is a hub of talent. The biggest AI companies tend to attract specialised engineers, while younger ones run on small founding teams and hire generalists. Looking at headcount, last funding round, and HQ location side by side gives you a quick read on where the talent density is highest.
Refolk turns this list into a search. Ask for “AIengineers in San Francisco hiring senior ML” or “designers at AIcompanies who shipped a product in 2025” and Refolk returns a fresh ranked shortlist with the sources that earned each person a spot.
How this list is built
Last refreshed: Thu, 07 May 2026 04:00:05 GMT
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