| # | Company | Employees |
|---|---|---|
| 1 |
Mount Sinai Health Systemmountsinai.org
Provides distinguished care, conducts transformative research, and advances biomedical education through hospitals, a medical school, and extensive ambulatory network. |
30,202 |
| 2 |
NYU Langone Healthjobs.nyulangone.org
World-class academic medical center with top-ranked patient care, education, and research programs, serving diverse communities with excellence and inclusive values |
29,840 |
| 3 |
New York Universitynyu.edu
Research university with global campuses and academic sites offering diverse programs in arts, sciences, law, medicine, business, and professional studies. |
26,981 |
| 4 |
Columbia Universitycolumbia.edu
A renowned leader in higher education, Columbia attracts top minds to drive academic inquiry, make groundbreaking discoveries, and serve society globally |
23,565 |
| 5 |
Memorial Sloan Kettering Cancer Centermskcc.org
Specialized teams provide personalized cancer care, conduct innovative research, and train future scientists and clinicians worldwide. |
19,653 |
| 6 |
Weill Cornell Medicinecareers.weill.cornell.edu
A leading medical institution in NYC, conducting cutting-edge research, providing top-notch patient care, and educating future physicians and scientists worldwide |
10,471 |
| 7 |
Columbia University Irving Medical Centercuimc.columbia.edu
A leading clinical, research, and educational institution providing patient care, medical education, and public health services in northern Manhattan |
7,913 |
| 8 |
Icahn School of Medicine at Mount Sinaiicahn.mssm.edu
A leading medical school and research institution dedicated to training, research, and patient care to advance biomedical discoveries and improve outcomes |
7,423 |
| 9 |
The City College of New Yorkccny.cuny.edu
Offering high quality and affordable education in a variety of disciplines, emphasizing social change and academic excellence, with diverse programs and research opportunities |
3,528 |
| 10 |
ICAP at Columbia Universityicap.columbia.edu
A global leader in HIV and health systems strengthening, providing technical assistance and support to governments and organizations in nearly 50 countries |
2,304 |
| 11 |
Council on Foreign Relationscfr.org
An independent nonpartisan organization providing analysis on international issues through a think tank, publication of Foreign Affairs magazine, and online resources |
2,183 |
| 12 |
NYU Grossman School of Medicinemed.nyu.edu
A prestigious medical school training physicians and scientists, advancing patient care, medical education, and scientific research through groundbreaking discoveries and collaboration |
1,952 |
| 13 |
The Rockefeller Universityrockefeller.edu
A prestigious bioscience institution focused on uncovering life processes, leading to transformative medical breakthroughs with renowned faculty and cutting-edge facilities |
1,833 |
| 14 |
American Museum of Natural Historyamnh.org
Global institution focused on scientific research, education, and exhibitions about human cultures, natural world, and the universe. |
1,619 |
| 15 |
The Graduate Center, City University of New Yorkgc.cuny.edu
A hub of research, performance, and discussion for students dedicated to the belief that learning is a public good |
1,428 |
| 16 |
Child Mind Institutechildmind.org
A nonprofit dedicated to helping children and families with mental health and learning disorders through high-quality care, research, and advocacy |
1,145 |
| 17 |
Research Foundation of The City University of New Yorkrfcuny.org
A private, not-for-profit organization supporting CUNY faculty and staff in obtaining external funding from sponsors and managing funded programs |
1,083 |
| 18 |
Columbia University Mailman School of Public Healthpublichealth.columbia.edu
Leading public health school conducting research, education, and community collaboration to address pressing issues and translate results into action since 1922 |
976 |
| 19 |
Population Councilpopcouncil.org
A research organization focused on creating a better world through evidence-based solutions to improve the lives of underserved populations globally |
877 |
| 20 |
Columbia University Vagelos College of Physicians and Surgeonsvagelos.columbia.edu
A medical school within Columbia University focused on providing a comprehensive education in medicine, research, and community service in New York City |
757 |
| 21 |
Columbia Engineeringengineering.columbia.edu
A top engineering school in NYC, advancing technology through research, educating future leaders in engineering, and fostering innovation for a sustainable humanity |
737 |
| 22 |
NYU Center for Data Sciencecds.nyu.edu
The company is a leading center for Data Science training and research, offering graduate, undergraduate, and postdoctoral programs while shaping the field of Data Science |
123 |
| 23 | 41 | |
| 24 |
American Geographical Societyamericangeo.org
A pioneering organization in geographical research and education for over 170 years, promoting geographic knowledge for public policy and national security |
33 |
| 25 |
Irving Institute for Clinical and Translational Researchirvinginstitute.columbia.edu
Facilitating research, training, and collaboration to advance healthcare innovations for diverse populations, connecting academia with community partnerships to address health concerns |
21 |
| 26 |
Digital Supply Chain Institutedscinstitute.org
A research institute specializing in digital supply chains, focused on advancing enterprise SCs and implementing SCM best practices |
7 |
| 27 |
The Cure Is Nowthecureisnow.org
A national non-profit organization dedicated to eliminating diseases through awareness, education, and scientific research using emerging technologies |
5 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
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