| # | Company | Employees |
|---|---|---|
| 1 |
National Institute of Standards and Technology (NIST)nist.gov
An innovative federal agency advancing measurement science, standards, and technology to promote US innovation and industrial competitiveness |
4,946 |
| 2 |
Westatwestat.com
Westat provides professional services to improve outcomes in health, education, social policy, and transportation through research, data collection, clinical trials, evaluation, and communication |
3,419 |
| 3 |
Howard Hughes Medical Institute (HHMI)hhmi.org
Funding scientists and innovative research to advance human health, biology understanding, science education, and public engagement nationwide. |
2,304 |
| 4 |
University of Maryland School of Medicinemedschool.umaryland.edu
Leading biomedical research institution with top-tier faculty and extensive global reach, dedicated to advancing innovative research in virology, genomics, and global health |
2,179 |
| 5 |
The Henry M. Jackson Foundation for the Advancement of Military Medicinehjf.org
A nonprofit organization supporting military medical research, providing program management services to accelerate progress and advance Military Medicine |
2,036 |
| 6 |
Advarraadvarra.com
Advarra enhances clinical research by providing IRB and IBC review solutions, innovative technologies, and industry connections to optimize trial participant safety and research performance |
1,839 |
| 7 |
NIH Innovatesnih.gov
A federal agency focused on researching mental disorders, part of NIH Conducts basic and clinical research to prevent, treat, and cure mental illnesses |
1,542 |
| 8 |
Emmes Grouptheemmesgroup.com
A company dedicated to advancing public health and biopharmaceutical innovation by combining human intelligence with artificial intelligence in clinical research |
1,411 |
| 9 |
Emmestheemmesgroup.com
A global Contract Research Organization (CRO) with expertise in clinical research across various therapeutic areas, supporting public health and biopharmaceutical innovation |
1,188 |
| 10 |
Navitas Life Sciencesnavitaslifesciences.com
Global clinical research organization providing technology-driven CRO services, data science, regulatory support, and industry-focused consulting to biopharmaceutical clients worldwide |
1,014 |
| 11 |
USAMRIID — U.S. Army Medical Research Institute of Infectious Diseaseshealth.mil
Leading research institute developing medical solutions to protect military and civilian populations from biological threats through vaccines, drugs, diagnostics, and collaborations with government agencies and industry partners |
968 |
| 12 |
Space Telescope Science Institutestsci.edu
A leading space institute in Maryland, operating advanced space telescopes, curating data archives, conducting scientific research, and promoting diversity and inclusivity |
763 |
| 13 |
Walter Reed Army Institute of Researchwrair.health.mil
The company conducts research to develop vaccines, drugs, and solutions to protect military personnel from infectious diseases and enhance their resilience and readiness |
678 |
| 14 |
National Institutes of Health (NIH): Intramural Research Program (IRP)irp.nih.gov
Leading biomedical research institution within the National Institutes of Health, conducting innovative basic, translational, and clinical research to advance medical discoveries and treatments |
670 |
| 15 |
HJF Medical Research Internationalhjfmri.org
A nonprofit supporting international medical research and HIV prevention programs, focusing on vaccine development, clinical research, infectious disease surveillance, and global health initiatives |
630 |
| 16 |
Leidos Biomedical Research, Inc.
A research company in Frederick, Maryland, focusing on biomedical research and located at 1050 Boyles St |
589 |
| 17 |
NIH Clinical Center (CC)cc.nih.gov
Leading research hospital conducting clinical trials to develop treatments, therapies, and interventions for improved healthcare, receiving recognition for its public service efforts |
539 |
| 18 |
The National Institute on Drug Abuse (NIDA)nida.nih.gov
Advancing science on drug use and addiction to improve individual and public health through research and knowledge application |
489 |
| 19 |
National Institute of Neurological Disorders and Stroke (NINDS)ninds.nih.gov
The company provides medical advice and information on government transparency, while emphasizing user privacy and commenting guidelines on LinkedIn |
473 |
| 20 |
National Institute on Aging (NIA)nia.nih.gov
Government agency leading research on aging, Alzheimer's disease, and related dementias Engages on Twitter, Facebook, and YouTube for updates |
425 |
| 21 |
Social & Scientific Systemss-3.com
A health research company based in Maryland, providing technical and program management services to improve global public health outcomes |
393 |
| 22 |
National Human Genome Research Institute (NHGRI)genome.gov
NHGRI drives genomics research at NIH, conducting and funding world-class research, training experts, and collaborating to accelerate scientific and medical breakthroughs |
382 |
| 23 |
PPDâ„¢ Evideraâ„¢ Solutionsppd.com
Evidera offers evidence-based solutions for demonstrating the real-world effectiveness, safety, and value of biopharmaceutical products from early development to loss of exclusivity |
373 |
| 24 |
U.S. Army DEVCOM C5ISR Centerc5isrcenter.devcom.army.mil
A research center under US Army Futures Command focused on developing advanced technologies for information dominance and tactical superiority |
347 |
| 25 |
National Center for Advancing Translational Sciences (NCATS)ncats.nih.gov
Conducts and supports research to advance the science of translating discoveries into treatments, overcoming bottlenecks to get more treatments to patients faster. |
344 |
| 26 |
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)nichd.nih.gov
This organization conducts and supports research on various aspects of health and development in the United States and worldwide Visit their website for more information |
336 |
| 27 |
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)niddk.nih.gov
Supports medical research, grants to universities, government scientists conducting research on chronic diseases, research training, and provides science-based information to patients and professionals |
334 |
| 28 |
Foundation Fighting Blindnessfightingblindness.org
Dedicated to funding research for preventions, treatments, and cures for various retinal degenerative diseases affecting individuals worldwide |
186 |
| 29 |
HAIhistoryassociates.com
A team of researchers, storytellers, and museum professionals providing historical research, exhibit scripts, digital timelines, and archival support services worldwide |
185 |
| 30 |
Smithsonian Environmental Research Centerserc.si.edu
A research center studying marine biology, ecology, invasive species, global change, and pollution in coastal zones worldwide with a public hiking trail |
184 |
| 31 |
Johns Hopkins Technology Ventures (JHTV)ventures.jhu.edu
Advancing innovation ecosystems by translating Johns Hopkins University's research into accessible technologies, products, and services for societal benefit |
179 |
| 32 |
Naval Medical Research Commandmed.navy.mil
Conducts research in a wide range of areas from infectious diseases to combat casualty care to support Navy, Marine Corps, and US warfighters |
170 |
| 33 |
BIOQUALbioqual.com
Accredited facility providing trained staff for research in infectious diseases, cancer, and other in vivo and in vitro studies |
169 |
| 34 |
AAALAC Internationalaaalac.org
A nonprofit organization promoting humane treatment of animals in science through voluntary accreditation programs for research institutions worldwide |
168 |
| 35 |
Center for Scientific Review (CSR)csr.nih.gov
The company serves as the gateway for NIH grant applications, organizing peer review groups to evaluate research grant applications for scientific merit |
155 |
| 36 |
National Institute of Dental and Craniofacial Research (NIDCR at NIH)nidcr.nih.gov
A federal agency dedicated to research on dental, oral, and craniofacial health and disease as part of the National Institutes of Health |
146 |
| 37 |
HEMI - Hopkins Extreme Materials Institute at Johns Hopkins Universityhemi.jhu.edu
A leading research institute at Johns Hopkins University focusing on advancing materials science for extreme conditions to protect people and the planet |
43 |
| 38 |
Technology Assessment & Transfer, Inctechassess.com
A high technology company develops and commercializes advanced ceramic materials for defense, bio-medical, and industrial applications, focusing on innovation and technology assessments for government agencies |
10 |
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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.
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