| # | Company | Employees |
|---|---|---|
| 1 |
Harvard Universityharvard.edu
An institution dedicated to teaching, learning, and research, producing global leaders across disciplines since 1636 Maintains flagship social media channels |
34,940 |
| 2 |
Massachusetts Institute of Technologyweb.mit.edu
A private research university in Cambridge, Massachusetts, advancing knowledge and educating students in science and technology-focused areas |
23,586 |
| 3 |
Massachusetts General Hospitalmassgeneral.org
Dedicated to providing top-notch healthcare in a compassionate environment through innovative research and education, improving health in diverse communities served |
20,001 |
| 4 |
Mass General Brighammassgeneralbrigham.org
Integrated academic health system providing patient care, research, teaching, and community services through hospitals, insurance, and specialized medical centers. |
17,890 |
| 5 |
Northeastern Universitynortheastern.edu
Global research university combining experiential learning with cooperative education, offering diverse programs and addressing health, security, and sustainability challenges worldwide. |
17,385 |
| 6 |
Boston University School of Public Healthbu.edu
Graduate education and research in public health fields, focusing on improving health of vulnerable populations through policy and practice. |
16,431 |
| 7 |
Boston Universitybu.edu
Leading private research and teaching institution with global presence. Inclusive, serving, and collaborating with Boston since 1869. |
15,935 |
| 8 |
Harvard Business Schoolhbs.edu
Offers MBA, PhD, executive education, and online programs focused on leadership development, business practice, and entrepreneurship worldwide. |
12,457 |
| 9 |
Harvard Medical Schoolhms.harvard.edu
A prestigious medical school fostering a diverse community of leaders dedicated to advancing knowledge, education, and research to alleviate human suffering |
12,076 |
| 10 |
University at Buffalobuffalo.edu
Extraordinary community, creative activity and research changing the world. New York State's flagship university, AAU member. |
11,906 |
| 11 |
University of Massachusetts Amherstumass.edu
A top-ranked teaching and research institution in western Massachusetts with about 28,500 students, part of the University of Massachusetts system |
11,525 |
| 12 |
Boston Collegebc.edu
A Jesuit Catholic university in Boston that emphasizes academic excellence, leadership, and service to society |
9,503 |
| 13 |
Dana-Farber Cancer Institutedana-farber.org
Providing expert, compassionate care to children and adults with cancer while advancing understanding, treatment, cure, and prevention. |
8,981 |
| 14 |
UMass Chan Medical Schoolumassmed.edu
Trains doctors, scientists, and nurses, conducts groundbreaking research and clinical trials, offers consulting services, and manufactures vaccines and biologics. |
6,314 |
| 15 |
University of Massachusetts Lowelluml.edu
Public university offering affordable, high-quality education with hands-on learning, accredited programs, and strong student support for career readiness. |
4,772 |
| 16 |
MIT Lincoln Laboratoryll.mit.edu
Research and development center applying advanced technology to national security problems, focusing on long-term innovation and rapid prototyping. |
4,083 |
| 17 |
Worcester Polytechnic Institutewpi.edu
A prestigious institution offering opportunities for ambitious individuals to succeed, be challenged, and make a difference in the world |
3,846 |
| 18 |
Roswell Park Comprehensive Cancer Centerroswellpark.org
A comprehensive cancer center offering cutting-edge care, research, and education to reduce the cancer burden and set national standards |
3,751 |
| 19 |
Brandeis Universitybrandeis.edu
Private research university offering inclusive, high-quality education with renowned faculty, fostering innovation and diverse student community in Boston suburbs. |
3,483 |
| 20 |
University of Massachusettsyoutube.com
Public university system offering high-quality education, conducting extensive research, and providing impactful public service to communities locally and globally. |
3,476 |
| 21 |
Broad Institute of MIT and Harvardbroadinstitute.org
Multidisciplinary teams collaborate across labs and programs to address complex biomedical challenges in human biology and disease worldwide. |
3,204 |
| 22 |
MIT Sloan School of Managementmitsloan.mit.edu
A leading management school in Cambridge, Massachusetts that focuses on inventing ideas with impact, discovering future challenges and opportunities |
3,132 |
| 23 |
University of Massachusetts Dartmouthumassd.edu
A national research university offering undergraduate, graduate, and doctoral programs, fostering curious and innovative students on a unique campus Located on the SouthCoast |
2,644 |
| 24 |
Harvard T.H. Chan School of Public Healthhsph.harvard.edu
A historic institution rooted in public health activism, offering professional training programs in preventive medicine and sanitary engineering since 1913 |
2,640 |
| 25 |
McLean Hospitalmcleanhospital.org
A leading psychiatric hospital dedicated to treating mental health conditions, conducting innovative research, and providing education to improve patient outcomes |
2,296 |
| 26 |
Boston University School of Medicinebumc.bu.edu
A dedicated medical school focused on educating students, conducting research, and promoting public health with values of excellence and social justice |
2,102 |
| 27 |
Mass General Hospitalmassgeneral.org
A higher education company located in Cambridge, Massachusetts, United States, specializing in providing healthcare services and medical research at Mass General Hospital |
1,839 |
| 28 |
Instituto Tecnol贸gico Aut贸nomo de M茅xicomtr.bio
Contributes to integral personal development and a more free, just, and prosperous Mexico, with academic excellence and high-quality autonomous research. |
1,552 |
| 29 |
Massachusetts Eye and Earmasseyeandear.org
Specialty hospital providing excellent care for disorders of the eye, ear, nose, and throat, while also focusing on education and research |
1,514 |
| 30 |
U.S. Army DEVCOM Soldier Centersc.devcom.army.mil
Innovative science and technology solutions for US Army Soldiers to optimize performance, survivability, mobility, and combat effectiveness through various focus areas |
1,367 |
| 31 |
Woods Hole Oceanographic Institutionwhoi.edu
A nonprofit organization dedicated to ocean research, engineering, and education, focused on advancing solutions for the planet's future |
1,330 |
| 32 |
Harvard Kennedy Schoolhks.harvard.edu
This organization at Harvard Kennedy School aims to improve public policy, leadership, and global connections for a safer, freer, and more just society |
1,226 |
| 33 |
UMass Dartmouthumassd.edu
A public university in Massachusetts offering a wide range of undergraduate, graduate, and continuing education programs with a focus on student success and engagement |
1,207 |
| 34 |
Harvard Graduate School of Educationgse.harvard.edu
Dedicated to studying and improving education, believing it is crucial to society's health and future |
1,109 |
| 35 |
MIT Computer Science and Artificial Intelligence Laboratory (CSAIL)csail.mit.edu
Leading research in computer science and artificial intelligence, developing innovative technologies and fostering industry collaborations for future information technology advancements. |
999 |
| 36 |
MIT Media Labmedia.mit.edu
An interdisciplinary creative playground at the intersection of academic rigor and transformative technology, focused on positive societal impact |
801 |
| 37 |
Abdul Latif Jameel Poverty Action Lab (J-PAL)povertyactionlab.org
Global network conducting randomized evaluations to improve poverty reduction programs, informing policy through scientific evidence and training. |
760 |
| 38 |
Harvard University Graduate School of Designgsd.harvard.edu
A leading graduate school focused on educating professionals in architecture, landscape design, urban planning, and related disciplines to shape the 21st century built environment |
681 |
| 39 |
Harvard John A. Paulson School of Engineering and Applied Sciencesseas.harvard.edu
SEAS conducts collaborative research and education at the intersection of engineering, applied sciences, and technology to address global challenges and serve society |
600 |
| 40 |
Joslin Diabetes Centerjoslin.org
A world-renowned diabetes center dedicated to finding a cure and improving treatment for diabetes, with a mission to prevent, treat, and cure diabetes |
600 |
| 41 |
Saint-Gobain Research North Americasgr-northamerica.saint-gobain.com
Innovative research lab developing ceramic and polymer solutions for energy efficiency, resource conservation, and various industries through advanced manufacturing processes |
187 |
| 42 |
MIT Department of Materials Science and Engineering (DMSE)dmse.mit.edu
A global leader in Materials Science and Engineering, driving innovative research and solutions for a sustainable future through interdisciplinary projects |
62 |
| 43 |
Tufts Clinical and Translational Science Institute (CTSI)tuftsctsi.org
Dedicated to improving clinical care and health through innovative team science, connecting researchers, healthcare industry, and community stakeholders for better health outcomes |
46 |
| 44 |
MGH Mongan Institutemonganinstitute.org
A leading community of scientists focused on transforming health care and achieving health equity through research, training, and collaborations |
21 |
| 45 |
CHANGE Labchangelabboston.com
The CHANGE Lab at Northeastern University focuses on researching health disparities in adolescents, engaging with communities, and developing health equity programs |
19 |
| 46 |
NYSEARCH / NGAnysearch.org
A collaborative organization managing premier natural gas RD & D programs for gas utilities, focusing on improving safety, efficiency, and innovation in gas delivery systems |
10 |
| 47 |
MIT Materials Research Laboratorymrl.mit.edu
The company supports materials science research, interdisciplinary projects, educational outreach programs, and industry engagement to benefit society |
10 |
| 48 |
MIT Sanasana.mit.edu
A multidisciplinary organization using technology, analytics, and education to improve global health by democratizing access to quality healthcare and knowledge |
2 |
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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.
More company lists in Massachusetts
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- Hospitals and Health Care companies in Massachusetts 193
- Financial services firms in Massachusetts 166
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- Higher Education companies in Massachusetts 157
- IT Services and IT Consulting companies in Massachusetts 147
- Venture capital and private equity firms in Massachusetts 141
- Financial Services companies in Massachusetts 127
- Manufacturers in Massachusetts 119
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- Critical infrastructure operators in Massachusetts 108
- Healthcare providers in Massachusetts 108
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- Biotechnology Research companies in Massachusetts 97
- IT services companies in Massachusetts 93
- AI-native companies in Massachusetts 88
- Real Estate companies in Massachusetts 82
- Pharmaceutical companies in Massachusetts 82
- Non-profit Organizations companies in Massachusetts 77
- Contract manufacturers in Massachusetts 69
- Energy companies in Massachusetts 69