| # | Company | Employees |
|---|---|---|
| 1 |
University of Washingtonwashington.edu
Public research university offering diverse educational programs, extensive campuses, cultural activities, and high-quality medical care, engaging with communities. |
32,106 |
| 2 |
Washington State Universitywsu.edu
Statewide land-grant university offering research, education, and extension services in agriculture, health, engineering, business, and more across multiple campuses. |
11,522 |
| 3 |
Seattle Children'sseattlechildrens.org
Providing compassionate pediatric care, conducting breakthrough research, and supporting families to ensure children receive hope, care, and cures. |
8,756 |
| 4 |
Pacific Northwest National Laboratorypnnl.gov
Research in chemistry, Earth sciences, biology, and data science to enhance energy resiliency and support national security efforts. |
6,257 |
| 5 |
Fred Hutchfredhutch.org
Nonprofit organization specializing in cancer research and treatment, collaborating with UW Medicine to provide comprehensive cancer care services. |
6,180 |
| 6 |
Western Washington Universitywwu.edu
State-funded institution of higher education with 16,000 students offering 175+ academic programs, faculty access, multicultural diversity, and room to grow |
4,965 |
| 7 |
University of Washington - School of Medicineuwmedicine.org
A medical school focused on training primary-care physicians and advancing medical knowledge through research in the WWAMI region |
1,788 |
| 8 |
Allen Institutealleninstitute.org
An open science organization focused on advancing bioscience to improve human health through foundational research, developing standards, and fostering new ideas |
1,452 |
| 9 |
University of Washington Tacomatacoma.uw.edu
The company provides access to education, impacts economic development, conducts research, and is connected to the community's needs and aspirations |
990 |
| 10 |
Bloodworks Northwestbloodworksnw.org
Nonprofit organization advancing transfusion medicine, patient care, and research in the Pacific Northwest through blood donations and tissue support |
926 |
| 11 |
Institute for Health Metrics and Evaluationhealthdata.org
An independent global health research center providing rigorous measurement of health problems and evaluating strategies to improve population health |
904 |
| 12 |
Seattle Cancer Care Alliancefredhutch.org
merger of Fred Hutchinson Cancer Research Center and Seattle Cancer Care Alliance into Fred Hutchinson Cancer Center for cancer research and care |
782 |
| 13 |
Paul G. Allen School of Computer Science & Engineeringcs.washington.edu
Educating future innovators and addressing humanity's challenges through computer science and engineering at a renowned academic institution |
687 |
| 14 |
Washington State University Vancouverlinktr.ee
An active research university dedicated to expanding higher education opportunities in Southwest Washington |
493 |
| 15 |
University of Washington Information Schoolischool.uw.edu
A renowned information school offering programs in informatics, library science, and information management to prepare professionals for various fields |
426 |
| 16 |
International Training and Education Center for Health (I-TECH)go2itech.org
Global network supporting health workforce development and national health systems in resource-limited countries through partnerships with local stakeholders and organizations worldwide |
370 |
| 17 |
The Geneva Foundationgenevausa.org
A nonprofit organization advancing military medicine through research, development, and education, with expertise in federal grants, contracts, clinical trials, and education services |
345 |
| 18 |
University of Washington School of Public Healthsph.washington.edu
Education, research, and service in public health, producing graduates who transform communities and lead health organizations nationwide. |
331 |
| 19 |
Ai2allenai.org
The company conducts high-impact AI research and engineering to contribute to humanity's advancement and progress |
314 |
| 20 |
Benaroya Research Institutebenaroyaresearch.org
A non-profit research institute focused on rebalancing the immune system to treat autoimmune diseases and achieve a healthy immune system for individuals |
311 |
| 21 |
WSU Elson S. Floyd College of Medicinemedicine.wsu.edu
A community-based medical school in Washington, training future healthcare leaders to serve in underserved communities and where they are most needed |
295 |
| 22 |
Institute for Systems Biology (ISB)isbscience.org
A collaborative non-profit biomedical research organization focusing on brain health, cancer, sepsis, aging, and various diseases with translational science for clinical impacts |
273 |
| 23 |
Institute for Protein Design, University of Washingtonipd.uw.edu
Innovative team of researchers and innovators creating breakthroughs in AI research and protein medicine to make a global impact |
208 |
| 24 |
Allen Institute for Immunologyalleninstitute.org
The company researches the human immune system to understand diseases, improve immune health, enhance diagnostics, and develop treatments for immune-related conditions |
65 |
| 25 |
Advanced Materials Science & Engineering Centercse.wwu.edu
The company provides education in materials science, supports interdisciplinary research, and enhances regional industry competitiveness through collaboration, innovation, and technical resources |
3 |
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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 Nov 2, 2026.
More company lists in Washington State
- The largest companies in Washington State 2,144
- Manufacturers in Washington State 176
- Education providers in Washington State 169
- Retail chains in Washington State 161
- IT Services and IT Consulting companies in Washington State 160
- SaaS companies in Washington State 155
- Critical infrastructure operators in Washington State 149
- IT services companies in Washington State 145
- Software Development companies in Washington State 140
- Public sector organisations in Washington State 139
- Healthcare providers in Washington State 136
- Hardware manufacturers in Washington State 122
- AI companies in Washington State 111
- Hospitals and Health Care companies in Washington State 107
- Consulting firms in Washington State 106
- Financial services firms in Washington State 92
- Construction companies in Washington State 87
- Higher Education companies in Washington State 74
- Family-owned companies in Washington State 73
- E-commerce companies in Washington State 69
- Hotel and hospitality groups in Washington State 68
- Real Estate companies in Washington State 68
- Financial Services companies in Washington State 63
- Aerospace and defence companies in Washington State 60
The same list elsewhere in United States
- Research institutes in the United States 982
- Research institutes in California 104
- 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 Virginia 35
- Research institutes in Illinois 32
- Research institutes in Ohio 32
- Research institutes in North Carolina 25
- Research institutes in New York 43
- Research institutes in Washington 38