Top AI companies

Companies building AI products, foundation models, and applied ML platforms.

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Ranked by current headcount across the largest AI companies. Refreshed daily.

1
Roche· Basel, Basel, Switzerland
Roche is a global pioneer in pharmaceuticals and diagnostics focused on advancing science to improve people’s lives. The combined strengths of pharmaceuticals and diagnostics under one roof have made Roche the leader in personalised healthcare – a strategy that aims to fit the right treatment to each patient in the best way possible.Roche is the world’s largest biotech company, with truly differentiated medicines in oncology, immunology, infectious diseases, ophthalmology and diseases of the central nervous system. Roche is also the world leader in in vitro diagnostics and tissue-based cancer diagnostics, and a frontrunner in diabetes management.Founded in 1896, Roche continues to search for better ways to prevent, diagnose and treat diseases and make a sustainable contribution to society. The company also aims to improve patient access to medical innovations by working with all relevant stakeholders. Thirty medicines developed by Roche are included in the World Health Organization Model Lists of Essential Medicines, among them life-saving antibiotics, antimalarials and cancer medicines. Roche has been recognised as the Group Leader in sustainability within the Pharmaceuticals, Biotechnology & Life Sciences Industry ten years in a row by the Dow Jones Sustainability Indices (DJSI).For more information, please visit https://careers.roche.comRead our community guidelines here: https://www.roche.com/some-guidelines.htm#Roche #Biotechnology #Pharmaceuticals #Diagnostics #Healthcare #PersonalisedHealthcare #GreatPlaceToWork #Innovation
- 106.5k employees
2
Thermo Fisher Scientific· Waltham, Massachusetts, United States
About Thermo Fisher ScientificThermo Fisher Scientific Inc. is the world leader in serving science, with annual revenue of approximately $40 billion. Our Mission is to enable our customers to make the world healthier, cleaner and safer. Whether our customers are accelerating life sciences research, solving complex analytical challenges, increasing productivity in their laboratories, improving patient health through diagnostics or the development and manufacture of life-changing therapies, we are here to support them. Our global team delivers an unrivaled combination of innovative technologies, purchasing convenience and pharmaceutical services through our industry-leading brands, including Thermo Scientific, Applied Biosystems, Invitrogen, Fisher Scientific, Unity Lab Services, Patheon and PPD. For more information, please visit www.thermofisher.com.
- Post-IPO debt
- 101k employees
- Founded 1956
3
Amgen· Thousand Oaks, California, United States
Amgen harnesses the best of biology and technology to fight the world’s toughest diseases, and make people’s lives easier, fuller and longer. We helped establish the biotechnology industry, and we remain on the cutting-edge of innovation, using technology and human genetic data to push beyond what’s known today. Our investment in research and development has yielded a robust pipeline that builds on our existing portfolio of medicines to treat cancer, heart disease, osteoporosis, inflammatory diseases and rare diseases.Amgen is one of 30 companies comprising the Dow Jones Industrial Average®, and part of the Nasdaq-100 Index®. In 2024, Amgen was named one of the “World’s Most Innovative Companies” by Fast Company and one of “America’s Best Large Employers” by Forbes.For more information, visit Amgen.com and follow us on X, LinkedIn, Instagram, TikTok, YouTube and Threads. 🔗 Community Guidelines: https://wwwext.amgen.com/community-guidelines🔗Global Privacy Statement Directory: www.amgen.com/dpSpecial Advisory: Please be cautious of scam recruitment offers claiming to be from Amgen. Such scams may come from various sources, including fake websites and/or unsolicited emails and seek to obtain personal data or payment from victims by offering jobs that do not exist. Please be advised that Amgen would never ask for payment to progress a job application. When in doubt, please check to see if the position in question is posted on this website before applying. Additionally, please report any suspicious recruiting activity to https://complaint.ic3.gov/ and thank you for your assistance.
- Post-IPO debt
- 41.4k employees
- Founded 1980
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4
ICON plc· Greater Dublin
Since our foundation in Dublin, Ireland in 1990, our mission has been to help our clients to accelerate the development of drugs and devices that save lives and improve quality of life. We do this by delivering best in class information, solutions and performance, with an unyielding focus on quality at all times.We offer a full range of consulting, development and commercialisation services from a global network of offices in 53 countries. We focus our innovation on the factors that are critical to our clients – reducing time to market, reducing cost, and increasing quality – and our global team of experts has extensive experience in a broad range of therapeutic areas.
- Post-IPO debt
- 35.2k employees
- Founded 1990
5
The National Institutes of Health· Bethesda, Maryland, United States
NIH is the only agency of its kind. We impact the health of the country and the world through unique and innovative medical research. Did you know that NIH is the largest public funder of biomedical research in the world, investing more than $32 billion a year to enhance life, and reduce illness and disability? NIH funded research has led to breakthroughs and new treatments, helping people live longer, healthier lives, and building the research foundation that drives discovery.Whether you are graduating with a bachelor's degree, working on your doctoral degree, entering the workforce for the first time, or changing careers, NIH offers a place for you to start and plenty of room to grow your career.When you join us, you’re not just advancing your career — you’re driving the health of our country forward.Official LinkedIn Account of the NIH. Privacy policy: http://go.usa.gov/x9svNComment policy: https://bit.ly/3G6xq94Engagement ≠ endorsement
- Grant
- 28.7k employees

6
Eurofins· Luxembourg, Luxembourg, Luxembourg
Since 1987, Eurofins has grown from one laboratory in Nantes, France to over 65,000 staff across a network of independent companies in 59 countries, operating over 950 laboratories. Performing over 450 million tests every year, Eurofins offers a portfolio of over 200,000 analytical methods to evaluate the safety, identity, composition, authenticity, origin, traceability and purity of biological substances and products, as well as providing innovative clinical diagnostic testing services, as one of the leading global emerging players in specialised clinical diagnostics testing. Ever since its IPO on the French stock exchange in 1997, Eurofins has been one of the fastest growing listed European companies.
- Post-IPO debt
- 25k employees
- Founded 1987
7
UCL· London, England, United Kingdom
UCL (University College London) is London's leading multidisciplinary university, ranked 9th in the QS World University Rankings.Established in 1826 UCL opened up education in England for the first time to students of any race, class or religion and was also the first university to welcome female students on equal terms with men. Today UCL is made up of remarkable people: eminent professors and exceptional students. Academic excellence and conducting research that addresses real-world problems inform our ethos to this day.To see more photos of UCL you can visit our Flickr Gallery:www.flickr.com/photos/uclnews/sets/ To view videos of UCL and our work, you can subscribe to our YouTube Channel:http://www.youtube.com/user/UCLTVLooking for a job at UCL? Find out more about working with us and view the latest vacancies:https://www.ucl.ac.uk/jobs
- Grant
- 24.7k employees
8
Syneos Health· Morrisville, North Carolina, United States
Syneos Health® is a leading fully integrated biopharmaceutical solutions organization built to accelerate customer success. We translate unique clinical, commercial and real world insights into outcomes to address modern market realities. We bring together a talented team of professionals with a deep understanding of patient and physician behaviors and market dynamics. Together we share diverse insights, use the latest technologies and apply advanced business practices to speed our customers’ delivery of important therapies to patients.Syneos Health is powered by an authentic, inclusive and high-performance culture that cares for colleagues, customers, patients, communities and the environment.
- Private equity
- 23.8k employees
- Founded 1985
9
CNRS· Paris, Île-de-France, France
- 23.2k employees
10
CSL· Carlton, Victoria, Australia
CSL is a leading global biopharma company with a dynamic portfolio of lifesaving medicines, including those that treat haemophilia and immune deficiencies, vaccines to prevent influenza, and therapies in iron deficiency, dialysis and nephrology. Since our start in 1916, we have been driven by our promise to save lives using the latest technologies.Today, CSL – including our businesses, CSL Behring, CSL Seqirus, and CSL Vifor – provides lifesaving products to patients in more than 100 countries and employs 29,000+ people. Our unique combination of commercial strength, R&D focus and operational excellence enables us to identify, develop and deliver innovations so our patients can live life to the fullest.See our community guidelines: https://bit.ly/3Bs17Ra
- Post-IPO equity
- 23.1k employees
- Founded 1916

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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 18,492 AI companies in Refolk’s 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.

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Refolk pulled the largest companies in AI from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 21:44:46 GMT

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