| # | Company | Employees |
|---|---|---|
| 1 |
University of Virginiavirginia.edu
A renowned institution of higher learning, focused on meeting challenges, promoting access, and preparing citizen-leaders with empathy, integrity, and truth #GreatandGood |
16,633 |
| 2 |
Virginia Techvt.edu
Comprehensive university offering diverse degree programs, leading research initiatives, and driving technological innovation and economic growth regionally. |
15,504 |
| 3 |
Virginia Commonwealth Universityvcu.edu
Innovative university focused on excellence, diversity, and research Leading breakthrough work, student startups, and healthcare disparities Empowering graduates to make a global impact |
11,797 |
| 4 |
George Mason Universitygmu.edu
Public research university offering over 200 degree programs across multiple campuses, fostering innovation, diversity, and career readiness for students. |
10,741 |
| 5 | 9,164 | |
| 6 |
U.S. Geological Survey (USGS)usgs.gov
Provide impartial scientific data on ecosystems, natural hazards, resources, climate impacts, and core systems for timely environmental information. |
7,704 |
| 7 |
Old Dominion Universityodu.edu
Virginia's research university offers rigorous academics, residential community, innovative research, and a wide range of programs for student success and career development |
6,798 |
| 8 |
The Aerospace Corporationaerospace.org
Providing objective technical expertise and leadership to solve complex space challenges, ensuring mission success for national security and commercial space programs. |
5,274 |
| 9 |
William & Marywm.edu
Higher education institution offering diverse majors, strong STEM focus, faculty-mentored research, career services, and global study opportunities. |
4,871 |
| 10 |
Federal Reserve Bank of Richmondrichmondfed.org
Support financial system safety, promote stable prices and employment, provide educational resources, and engage with communities in the Fifth District. |
2,196 |
| 11 |
CNA Corporationcna.org
A nonprofit research organization focused on national security, providing actionable solutions to complex problems through data analysis and field programs |
2,094 |
| 12 |
American Institutes for Researchair.org
A nonprofit research institution providing evidence-based solutions for urgent challenges in education, health, workforce, human services, and international development worldwide |
2,010 |
| 13 |
Eastern Virginia Medical Schoolodu.edu
An academic health center dedicated to excellence in medical education, research, and patient care with a focus on community orientation |
1,974 |
| 14 |
NASA Langley Research Centernasa.gov
Pioneering aeronautics research center located in Hampton, Virginia, on the Chesapeake Bay, contributing to NASA's aerospace and science advancements |
1,714 |
| 15 |
Institute for Defense Analysesida.org
Provides objective, scientifically rigorous research and advice on national security issues through federally funded research centers with expert staff. |
1,524 |
| 16 |
Bibliotheca Alexandrinabibalex.org
A center of excellence promoting knowledge dissemination, cultural dialogue, and understanding through digital age innovations, with a focus on Egypt |
1,353 |
| 17 |
Noblisnoblis.org
A nonprofit organization providing scientific, technology, and strategy services to government and industry clients in national security, healthcare, and environmental sustainability |
1,313 |
| 18 |
University of Virginia School of Medicinemed.virginia.edu
The company educates and trains physicians and research scientists to advance medical knowledge, promote equity, diversity, and inclusiveness for healthier lives |
1,247 |
| 19 | 904 | |
| 20 |
Jefferson Labjlab.org
A national accelerator facility in Virginia, leading research into quarks, gluons, and superconducting technology while advancing data analysis capabilities for research |
875 |
| 21 |
Riverside Researchriversideresearch.org
A nonprofit organization conducting independent research in various scientific fields to advance innovation and provide high-value solutions to government customers |
801 |
| 22 |
Virginia Commonwealth University School of Medicinemedschool.vcu.edu
Providing transformative medical education for students, compassionate care for patients, and advancing medical research and healthcare practices to improve quality of life |
523 |
| 23 |
United Network for Organ Sharing (UNOS)unos.org
UNOS powers the national organ donation and transplant system, working to save lives through effective coordination and communication |
481 |
| 24 |
Office of Naval Researchnre.navy.mil
Leading provider of science and technology for the Department of the Navy, ensuring technological advantage for the Navy and Marine Corps worldwide |
472 |
| 25 |
National Radio Astronomy Observatorynrao.edu
A leading observatory developing cutting-edge radio telescope arrays, impacting astrophysics with facilities in Virginia, New Mexico, and Chile |
471 |
| 26 |
Virginia Tech Carilion School of Medicinemedicine.vtc.vt.edu
Innovative medical school and research institute merging Virginia Tech's strengths with Carilion Clinic's expertise to develop physician leaders and advance biomedical science |
440 |
| 27 |
Virginia Institute of Marine Sciencevims.edu
A leading marine research and education center with a mission to conduct research, educate students and citizens, and provide advisory services in coastal ocean and estuarine science |
438 |
| 28 |
Virginia-Maryland College of Veterinary Medicinevetmed.vt.edu
A leading veterinary college focused on educating students in veterinary medicine, biomedical sciences, and public health, while conducting research and providing clinical services |
435 |
| 29 |
George Mason University - College of Engineering and Computingcec.gmu.edu
A leading college of engineering and computing with innovative programs, cutting-edge research, and a focus on emerging technologies in Northern Virginia |
379 |
| 30 |
George Washington's Mount Vernonmountvernon.org
Historic estate maintained by the Mount Vernon Ladiesโ Association, preserving and educating about George Washingtonโs legacy through robust programs and initiatives |
355 |
| 31 |
Virginia Tech College of Engineeringeng.vt.edu
A leading university in engineering education and research, offering a wide range of programs in innovative technology fields with a global impact |
338 |
| 32 |
George Mason University - Department of Psychologypsychology.gmu.edu
Conducting research in psychology to bridge theory and practice, addressing real-world problems with a focus on impact and innovation |
333 |
| 33 |
UVA McIntire School of Commercecommerce.virginia.edu
A leading business school offering innovative education, global learning opportunities, research centers, and highly ranked undergraduate and graduate programs in commerce |
321 |
| 34 |
Virginia Tech Materials Science and Engineeringmse.vt.edu
The company specializes in materials and serves various industries with their expertise |
15 |
| 35 |
ODU School of Cybersecurityodu.edu
The company promotes interdisciplinary cybersecurity research and education to advance knowledge and awareness in the field |
6 |
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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 Virginia
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- Aerospace and defence companies in Virginia 248
- Education providers in Virginia 224
- Critical infrastructure operators in Virginia 131
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- AI companies in Virginia 128
- Retail chains in Virginia 128
- Manufacturers in Virginia 127
- Defense and Space Manufacturing companies in Virginia 123
- Hospitals and Health Care companies in Virginia 122
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- Software Development companies in Virginia 117
- Financial services firms in Virginia 116
- SaaS companies in Virginia 103
- Non-profit Organizations companies in Virginia 102
- Higher Education companies in Virginia 100
- Cybersecurity companies in Virginia 95
- Publicly traded companies in Virginia 92
- Hardware manufacturers in Virginia 91
- Financial Services companies in Virginia 90
- Real Estate companies in Virginia 90
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 Pennsylvania 37
- Research institutes in Florida 36
- Research institutes in Illinois 32
- Research institutes in Ohio 32
- Research institutes in North Carolina 25
- Research institutes in Washington State 25
- Research institutes in New York 43
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