| # | Company | Employees |
|---|---|---|
| 1 |
Penn State Universitypsu.edu
Providing interdisciplinary education and resources across multiple campuses, fostering student success and positive global community impact through knowledge and experience. |
31,986 |
| 2 |
University of Pennsylvaniaupenn.edu
Renowned Ivy League university with 12 schools offering a wide range of programs including arts, sciences, engineering, business, and medicine |
22,558 |
| 3 |
Penn Medicine, University of Pennsylvania Health Systempennmedicine.org
Leading academic medical center combining cutting-edge research, comprehensive patient care, and education to improve health and transform lives regionally. |
21,979 |
| 4 |
University of Pittsburghpitt.edu
Top-ranked public institution in Pennsylvania, member of leading research universities Known for innovative discoveries and shaping future paths |
19,349 |
| 5 |
Geisingergeisinger.org
Healthcare organization with 13 hospital campuses, research centers, medical college, and health plan serving millions in Pennsylvania Committed to quality healthcare |
15,962 |
| 6 |
Temple Universitytemple.edu
A top-tier research institution in a vibrant city, offering diverse degree programs to prepare future leaders for impactful careers |
13,124 |
| 7 |
Carnegie Mellon Universitycmu.edu
University providing education that develops problem solvers, innovators, and pioneers in technology and the arts, ready for careers. |
11,021 |
| 8 |
Drexel Universitydrexel.edu
Academically comprehensive urban research university with a globally engaged community and a premier cooperative education program nationwide. |
7,580 |
| 9 |
Thomas Jefferson Universityjefferson.edu
University focused on innovative health education, interdisciplinary learning, expert faculty collaboration, and redefining possibilities in health, education, and discovery. |
5,700 |
| 10 |
Lehigh Universitywww2.lehigh.edu
A premier residential research university offering rigorous academic programs in various fields to undergraduate and graduate students worldwide Located in Pennsylvania |
4,473 |
| 11 |
Naval Nuclear Laboratory (FMP)navalnuclearlab.energy.gov
The company operates the Naval Nuclear Laboratory, supporting the US Naval Nuclear Propulsion Program through research, development, training, and technical support |
3,940 |
| 12 |
West Chester University of Pennsylvaniawcupa.edu
A top regional public university offering over 180 undergraduate and graduate programs, focusing on teaching, research, and community service |
3,581 |
| 13 |
University of Pittsburgh School of Medicinemedschool.pitt.edu
Training physician leaders and scientists to improve health, advance research, promote equity, and collaborate internationally in medicine and education. |
2,199 |
| 14 |
Fox Chase Cancer Centerfoxchase.org
Dedicated cancer hospital with expert multidisciplinary teams advancing prevention, diagnosis, treatment, and survivorship through pioneering research and clinical care. |
2,146 |
| 15 |
Penn State College of Medicinemed.psu.edu
A leading medical institution focused on training healthcare providers and scientists, improving health outcomes, and advancing medical research worldwide |
1,303 |
| 16 |
Software Engineering Institute | Carnegie Mellon Universitysei.cmu.edu
The company conducts research on software engineering, cybersecurity, and AI, creating and testing innovative technologies for government and private industry since 1984 |
1,061 |
| 17 |
UPMC Hillman Cancer Centerhillmanresearch.upmc.edu
An NCI-designated cancer center affiliated with a university, providing high-level clinical care, research, and education to cancer patients and professionals |
1,028 |
| 18 |
Temple University - Lewis Katz School of Medicinetemple.edu
Leading medical school offering humanistic education, top clinical training, and groundbreaking research, recognized internationally, honored nationally, and essential locally |
1,015 |
| 19 |
Philadelphia Universityjefferson.edu
A professions-focused university resulting from the merger of two renowned institutions in 2017 Offers over 200 academic programs in various fields |
758 |
| 20 |
The Applied Research Laboratory at Penn State Universityarl.psu.edu
An integral part of a leading research university, focusing on national security, economic competitiveness, and quality of life through research, development, and technology transition |
600 |
| 21 |
Carnegie Mellon University School of Computer Sciencescs.cmu.edu
They provide education and research opportunities in computer science at a renowned institution known for its excellence in the field |
496 |
| 22 |
The Wistar Institutewistar.org
The institute is dedicated to biomedical research, specializing in cancer and immunology, leading to breakthrough discoveries and training future researchers |
469 |
| 23 |
University of Pennsylvania Graduate School of Educationgse.upenn.edu
A pioneer in education research, innovation, and leadership development, offering top-ranked graduate programs and a diverse, inclusive community of professionals |
443 |
| 24 |
Villanova School of Businessvillanova.edu
The company provides top-ranked undergraduate and graduate business education, emphasizing academic rigor, ethics, leadership, and global citizenship through innovative programs and centers |
384 |
| 25 |
Carnegie Mellon University - Tepper School of Businesscmu.edu
A top-ranked business school pioneering management science education, emphasizing interdisciplinary collaboration, and offering undergraduate, graduate, doctoral, and executive education programs |
383 |
| 26 |
University of Pennsylvania School of Veterinary Medicinevet.upenn.edu
Innovative approach to veterinary medicine, providing medical treatments, public health vigilance, and education on animal and human health connections |
377 |
| 27 |
University of Pittsburgh School of Health and Rehabilitation Sciencesshrs.pitt.edu
Industry-leading health care education and research institution offering a wide range of programs in the fields of therapy, counseling, nutrition, and rehabilitation |
356 |
| 28 |
University of Pittsburgh Swanson School of Engineeringengineering.pitt.edu
A top-ranked engineering program focusing on research in sustainability, energy systems, bioengineering, computational modeling, and advanced materials and manufacturing |
351 |
| 29 |
Drexel University's Westphal College of Media Arts & Designdrexel.edu
A college specializing in design, media, and arts education, offering a range of undergraduate and graduate majors with top-ranked programs |
335 |
| 30 |
University of Pittsburgh School of Public Healthpublichealth.pitt.edu
A leading institution in public health education and research, partnering with stakeholders to address global health challenges through innovative solutions |
312 |
| 31 |
Penn Dental Medicinedental.upenn.edu
Private, Ivy-League institution with a history deeply rooted in forging precedents in dental education, research, and patient care. Dentistry taught as a specialty of medicine. |
312 |
| 32 |
Sidney Kimmel Comprehensive Cancer Center at Jeffersonjeffersonhealth.org
A leading cancer center focused on research, patient care, and education in Greater Philadelphia, striving to improve lives through innovation and breakthroughs #CancerCure |
244 |
| 33 |
University of Pennsylvania School of Dental Medicinedental.upenn.edu
A prestigious institution that provides dental education, conducts research, and offers patient care within a medical and multidisciplinary university setting |
240 |
| 34 |
CERT Division at the Software Engineering Institutecert.org
A trusted authority dedicated to improving cybersecurity by anticipating and solving challenges, offering proactive solutions for securing networked systems |
192 |
| 35 |
Human Engineering Research Laboratoriesherl.pitt.edu
The company specializes in improving mobility and function for people with disabilities through advanced engineering, clinical research, and medical rehabilitation |
57 |
| 36 |
University of Pennsylvania - Singh Center for Nanotechnologynano.upenn.edu
Cutting-edge nanotechnology research facilities providing state-of-the-art equipment for nanoscale characterization, measurement, and fabrication Home to three major core research facilities |
38 |
| 37 |
Lehigh University Materials Science and Engineeringengineering.lehigh.edu
The company specializes in developing innovative materials to address various societal challenges and equips students with skills to innovate in materials science |
21 |
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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 Nov 2, 2026.
More company lists in Pennsylvania
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- Financial services firms in Pennsylvania 264
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- Hardware manufacturers in Pennsylvania 173
- Higher Education companies in Pennsylvania 173
- IT Services and IT Consulting companies in Pennsylvania 172
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- Family-owned companies in Pennsylvania 130
- Public sector organisations in Pennsylvania 123
- Publicly traded companies in Pennsylvania 117
- SaaS companies in Pennsylvania 114
- Construction companies in Pennsylvania 106
- Insurance companies in Pennsylvania 101
- Distributors and wholesalers in Pennsylvania 100
- Software Development companies in Pennsylvania 96
- Real Estate companies in Pennsylvania 95
- Education Administration Programs companies in Pennsylvania 92
The same list elsewhere in United States
- Research institutes in the United States 982
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- Research institutes in New York State 87
- Research institutes in Massachusetts 65
- Research institutes in Texas 57
- Research institutes in Maryland 52
- Research institutes in Florida 36
- Research institutes in Virginia 35
- Research institutes in Illinois 32
- Research institutes in Ohio 32
- Research institutes in North Carolina 25
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- Research institutes in New York 43
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