# Research Services companies headquartered in North America

Tamtam tracks 480 Research Services companies headquartered in North America. This list ranks the 100 largest by number of employees on LinkedIn, led by PPD, Los Alamos National Laboratory and US Department of Agriculture (USDA) Agricultural Research Service (ARS). Their median headcount is 1,821. Half of them were founded in 1958 or later. The most common headquarters are Menlo Park (4), Washington (4) and Bethesda (3).

These North American companies primarily conduct scientific research and development across various domains. Many are government-affiliated laboratories or academic institutions, alongside private firms offering specialized research services. The focus areas include national security, energy, environmental science, and biomedical advancements. These are mostly large institutions with substantial employee counts.

Key organizations include PPD, offering global clinical development services; Los Alamos National Laboratory, focused on national security and advanced science; OpenAI, an AI research and deployment company; and Battelle, a science and technology company solving critical issues through R&D. A notable pattern is the significant presence of federally funded research and development centers, often managed by universities or non-profit entities, indicating a strong government investment in scientific inquiry.

🌍 North America · 100 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [PPD](https://www.tamtam.ai/c/ppd) (ppd.com)<br>Global clinical development services including laboratory testing, patient recruitment, and data analytics to accelerate drug innovation for pharma, biotech, and government organizations. | Research Services | 🇺🇸 Waltham | 20,440 |  |
| 2 | [Los Alamos National Laboratory](https://www.tamtam.ai/c/los-alamos-national-laboratory) (lanl.gov)<br>Multidisciplinary research institution focused on national security, nuclear stockpile safety, and advanced science in space, energy, computing, medicine, and nanotechnology. | Research Services | 🇺🇸 Los Alamos | 13,603 | 1943 |
| 3 | [US Department of Agriculture (USDA) Agricultural Research Service (ARS)](https://www.tamtam.ai/c/us-department-of-agriculture-usda-agricultural-research-service-ars) (ars.usda.gov)<br>A leading agricultural research agency under USDA, conducting cutting-edge projects to improve farming practices and technologies for consumers worldwide | Research Services | 🇺🇸 Washington | 9,821 | 1953 |
| 4 | [Lawrence Livermore National Laboratory](https://www.tamtam.ai/c/lawrence-livermore-national-laboratory) (llnl.gov)<br>Development and application of advanced science, technology, and engineering to enhance national security, counterterrorism, defense, energy, and environmental challenges. | Research Services | 🇺🇸 Livermore | 9,546 | 1952 |
| 5 | [OpenAI](https://www.tamtam.ai/c/openai) (openai.com)<br>An AI research and deployment company focused on creating safe and beneficial general-purpose artificial intelligence for the benefit of humanity | Research Services | 🇺🇸 San Francisco | 9,268 | 2015 |
| 6 | [MITRE](https://www.tamtam.ai/c/mitre) (mitre.org)<br>A non-profit corporation, operating federally funded R&D centers, dedicated to solving national challenges in defense, cybersecurity, healthcare, homeland security, and transportation | Research Services | 🇺🇸 McLean | 9,164 | 1958 |
| 7 | [U.S. Geological Survey (USGS)](https://www.tamtam.ai/c/u-s-geological-survey-usgs) (usgs.gov)<br>Provide impartial scientific data on ecosystems, natural hazards, resources, climate impacts, and core systems for timely environmental information. | Research Services | 🇺🇸 Reston | 7,704 | 1879 |
| 8 | [Yale School of Medicine](https://www.tamtam.ai/c/yale-school-of-medicine) (medicine.yale.edu)<br>A world-renowned center for biomedical research, education, and advanced healthcare with affiliations to leading institutions and a unique curriculum promoting independent thinking | Research Services | 🇺🇸 New Haven | 6,960 |  |
| 9 | [RTI International](https://www.tamtam.ai/c/rti-international) (rti.org)<br>Independent scientific research institute providing technical, social, statistical, and engineering expertise to solve critical global challenges and improve human conditions. | Research Services | 🇺🇸 Research Triangle Park | 6,607 | 1958 |
| 10 | [Oak Ridge National Laboratory](https://www.tamtam.ai/c/oak-ridge-national-laboratory) (ornl.gov)<br>Conducts scientific research and development to advance energy availability, environmental protection, national security, and technological innovation for the Department of Energy. | Research Services | 🇺🇸 Oak Ridge | 6,512 | 1943 |
| 11 | [Covance](https://www.tamtam.ai/c/covance)<br>Global leader in drug development services, partnering with pharmaceutical and biotech companies to bring top prescription drugs to market and provide innovative solutions | Research Services | 🇺🇸 Princeton | 6,294 |  |
| 12 | [Pacific Northwest National Laboratory](https://www.tamtam.ai/c/pacific-northwest-national-laboratory) (pnnl.gov)<br>Research in chemistry, Earth sciences, biology, and data science to enhance energy resiliency and support national security efforts. | Research Services | 🇺🇸 Richland | 6,257 | 1965 |
| 13 | [Battelle](https://www.tamtam.ai/c/battelle) (battelle.org)<br>A science and technology company solving critical issues through research, development, manufacturing, and services for government and commercial clients worldwide | Research Services | 🇺🇸 Columbus | 6,013 | 1929 |
| 14 | [Indiana University School of Medicine](https://www.tamtam.ai/c/indiana-university-school-of-medicine) (medicine.iu.edu)<br>A top-ranked medical school offering high-quality education, access to leading research, and a vibrant campus life in multiple Indiana cities | Research Services | 🇺🇸 Indianapolis | 5,277 | 1903 |
| 15 | [Berkeley Lab](https://www.tamtam.ai/c/berkeley-lab) (linktr.ee)<br>A national laboratory managed by the University of California for the Department of Energy, focusing on sustainable energy, materials innovation, computing, and scientific exploration | Research Services | 🇺🇸 Berkeley | 5,253 | 1931 |
| 16 | [Argonne National Laboratory](https://www.tamtam.ai/c/argonne-national-laboratory) (anl.gov)<br>National laboratory conducting advanced scientific and engineering research, developing innovative technologies, collaborating with industry and federal agencies for societal benefit. | Research Services | 🇺🇸 Lemont | 5,137 | 1946 |
| 17 | [National Institute of Standards and Technology (NIST)](https://www.tamtam.ai/c/national-institute-of-standards-and-technology-nist) (nist.gov)<br>An innovative federal agency advancing measurement science, standards, and technology to promote US innovation and industrial competitiveness | Research Services | 🇺🇸 Gaithersburg | 4,946 | 1901 |
| 18 | [National Research Council Canada / Conseil national de recherches Canada](https://www.tamtam.ai/c/national-research-council-canada-conseil-national-de-recherches-canada) (nrc.canada.ca)<br>Largest government research organization supporting innovation, helping SMEs scale, connecting Canadian innovators with advanced R&D capabilities, fostering partnerships. | Research Services | 🇨🇦 Ottawa | 4,732 | 1916 |
| 19 | [PRA Health Sciences](https://www.tamtam.ai/c/pra-health-sciences) (investor.iconplc.com)<br>clinical research organisation combining healthcare intelligence and advanced trial methods to improve efficiency, speed, and quality of clinical trials | Research Services | 🇺🇸 Raleigh | 4,426 |  |
| 20 | [Worldwide Clinical Trials](https://www.tamtam.ai/c/worldwide-clinical-trials) (worldwide.com)<br>A global CRO working with biotech and pharma companies to advance new treatments through clinical trials, bioanalytical services, and evidence studies | Research Services | 🇺🇸 Research Triangle Park | 4,181 | 1986 |
| 21 | [Idaho National Laboratory](https://www.tamtam.ai/c/idaho-national-laboratory) (linktr.ee)<br>Applied engineering laboratory supporting energy research, nuclear science, national defense, alternative energy, robotics, computing, biofuels, and infrastructure protection. | Research Services | 🇺🇸 Idaho Falls | 4,009 | 1949 |
| 22 | [National Science Foundation (NSF)](https://www.tamtam.ai/c/national-science-foundation-nsf) (nsf.gov)<br>Federal agency funding basic scientific research, supporting education, providing equipment, and promoting progress in science and national welfare. | Research Services | 🇺🇸 Alexandria | 3,833 | 1950 |
| 23 | [National Laboratory of the Rockies](https://www.tamtam.ai/c/national-laboratory-of-the-rockies) (nlr.gov)<br>Research and development of advanced energy systems, focusing on innovative technologies to improve energy efficiency and sustainability. | Research Services | 🇺🇸 Golden | 3,732 | 1977 |
| 24 | [Università di Catania](https://www.tamtam.ai/c/universita-di-catania) (unict.it)<br>Grants privileges for a General Studium in Catania, a most suitable and fertile city, starting Sicily's oldest university. | Research Services | 🇺🇸 Catania | 3,687 | 1434 |
| 25 | [Westat](https://www.tamtam.ai/c/westat) (westat.com)<br>Westat provides professional services to improve outcomes in health, education, social policy, and transportation through research, data collection, clinical trials, evaluation, and communication | Research Services | 🇺🇸 Bethesda | 3,419 | 1963 |
| 26 | [U.S. Naval Research Laboratory](https://www.tamtam.ai/c/u-s-naval-research-laboratory) (nrl.navy.mil)<br>Conducts scientific research with applications for the Department of the Navy, the Defense Department and the nation, driving innovative advances for the U.S. Navy and Marine Corps. | Research Services | 🇺🇸 Washington | 3,372 | 1923 |
| 27 | [Brookhaven National Laboratory](https://www.tamtam.ai/c/brookhaven-national-laboratory) (bnl.gov)<br>This company delivers transformative technology and discovery science to address various challenges in energy, environment, and nuclear fields through innovative research | Research Services | 🇺🇸 Upton | 3,317 | 1947 |
| 28 | [Broad Institute of MIT and Harvard](https://www.tamtam.ai/c/broad-institute-of-mit-and-harvard) (broadinstitute.org)<br>Multidisciplinary teams collaborate across labs and programs to address complex biomedical challenges in human biology and disease worldwide. | Research Services | 🇺🇸 Cambridge | 3,204 | 2003 |
| 29 | [X, The Moonshot Factory](https://www.tamtam.ai/c/x-the-moonshot-factory) (x.company)<br>A moonshot factory inventing and launching breakthrough technologies to create a radically better world | Research Services | 🇺🇸 Mountain View | 3,149 |  |
| 30 | [Southwest Research Institute](https://www.tamtam.ai/c/southwest-research-institute) (swri.org)<br>Independent nonprofit organization specializing in creating and transferring technology in engineering and physical sciences, with laboratories and facilities across multiple locations. | Research Services | 🇺🇸 San Antonio | 3,135 | 1947 |
| 31 | [Georgia Tech Research Institute](https://www.tamtam.ai/c/georgia-tech-research-institute) (gtri.gatech.edu)<br>A non-profit research organization affiliated with Georgia Tech, focused on advancing technology, providing innovative solutions, and educating future technology leaders | Research Services | 🇺🇸 Atlanta | 3,078 | 1934 |
| 32 | [SRI](https://www.tamtam.ai/c/sri) (sri.com)<br>An independent non-profit institute focused on research and development in Silicon Valley, creating innovative technologies for a better future globally | Research Services | 🇺🇸 Menlo Park | 2,968 | 1946 |
| 33 | [n/a - currently unemployed](https://www.tamtam.ai/c/n-a-currently-unemployed) (linkedin.com)<br>A company that provides a platform for sharing a list of potential leads or prospects for businesses | Research Services | 🇺🇸 Dallas | 2,676 | 2019 |
| 34 | [Mathematica](https://www.tamtam.ai/c/mathematica) (mathematica.org)<br>Provides evidence-based solutions to improve program efficiency, reduce costs, and enhance measurable impact for better policy outcomes. | Research Services | 🇺🇸 Princeton | 2,465 |  |
| 35 | [Fermilab](https://www.tamtam.ai/c/fermilab) (fnal.gov)<br>Premier particle physics laboratory conducting cutting-edge research, operating advanced accelerators, exploring dark matter and energy, collaborating with scientists worldwide Offering stimulating work environment | Research Services | 🇺🇸 Batavia | 2,376 | 1967 |
| 36 | [Scripps Research](https://www.tamtam.ai/c/scripps-research) (scripps.edu)<br>A leader in biomedical research, innovation, and education, working to improve human health and create hope for millions worldwide | Research Services | 🇺🇸 La Jolla | 2,348 | 1993 |
| 37 | [Canadian Nuclear Laboratories](https://www.tamtam.ai/c/canadian-nuclear-laboratories) (cnl.ca)<br>A leading organization in nuclear science and technology, specializing in research, development, engineering, waste management, and decommissioning services for various applications | Research Services | 🇨🇦 Chalk River | 2,340 | 2014 |
| 38 | [Howard Hughes Medical Institute (HHMI)](https://www.tamtam.ai/c/howard-hughes-medical-institute-hhmi) (hhmi.org)<br>Funding scientists and innovative research to advance human health, biology understanding, science education, and public engagement nationwide. | Research Services | 🇺🇸 Chevy Chase | 2,304 | 1953 |
| 39 | [NORC at the University of Chicago](https://www.tamtam.ai/c/norc-at-the-university-of-chicago) (norc.org)<br>An objective research organization partnering with clients to inform decisions on health, education, economy, and government programs for a better world | Research Services | 🇺🇸 Chicago | 2,285 | 1941 |
| 40 | [SLAC National Accelerator Laboratory](https://www.tamtam.ai/c/slac-national-accelerator-laboratory) (www6.slac.stanford.edu)<br>A diverse workforce of 1,700 employees at the forefront of cutting-edge research in various disciplines, collaborating in a stimulating environment | Research Services | 🇺🇸 Menlo Park | 2,235 | 1962 |
| 41 | [University of Maryland School of Medicine](https://www.tamtam.ai/c/university-of-maryland-school-of-medicine) (medschool.umaryland.edu)<br>Leading biomedical research institution with top-tier faculty and extensive global reach, dedicated to advancing innovative research in virology, genomics, and global health | Research Services | 🇺🇸 | 2,179 | 1807 |
| 42 | [CNA Corporation](https://www.tamtam.ai/c/cna-corporation) (cna.org)<br>A nonprofit research organization focused on national security, providing actionable solutions to complex problems through data analysis and field programs | Research Services | 🇺🇸 Arlington | 2,094 | 1942 |
| 43 | [The Henry M. Jackson Foundation for the Advancement of Military Medicine](https://www.tamtam.ai/c/the-henry-m-jackson-foundation-for-the-advancement-of-military-medicine) (hjf.org)<br>A nonprofit organization supporting military medical research, providing program management services to accelerate progress and advance Military Medicine | Research Services | 🇺🇸 Bethesda | 2,036 | 1983 |
| 44 | [American Institutes for Research](https://www.tamtam.ai/c/american-institutes-for-research) (air.org)<br>A nonprofit research institution providing evidence-based solutions for urgent challenges in education, health, workforce, human services, and international development worldwide | Research Services | 🇺🇸 Arlington | 2,010 | 1946 |
| 45 | [CPC](https://www.tamtam.ai/c/cpc) (cpcclinicalresearch.org)<br>A non-profit clinical research organization offering clinical research services worldwide, with a focus on innovative research and improving cardiovascular health in Colorado communities | Research Services | 🇺🇸 Aurora | 1,944 | 1989 |
| 46 | [Inotiv](https://www.tamtam.ai/c/inotiv) (inotiv.com)<br>A scientific research company offering comprehensive services and products, with a focus on delivering high-quality data and insights for success | Research Services | 🇺🇸 West Lafayette | 1,888 |  |
| 47 | [Advarra](https://www.tamtam.ai/c/advarra) (advarra.com)<br>Advarra enhances clinical research by providing IRB and IBC review solutions, innovative technologies, and industry connections to optimize trial participant safety and research performance | Research Services | 🇺🇸 Columbia | 1,839 | 1983 |
| 48 | [Huntsman Cancer Institute](https://www.tamtam.ai/c/huntsman-cancer-institute) (healthcare.utah.edu)<br>A comprehensive cancer center at a university, providing top-quality care, research, and training to cancer patients and future medical professionals | Research Services | 🇺🇸 Salt Lake City | 1,837 | 1999 |
| 49 | [The Rockefeller University](https://www.tamtam.ai/c/the-rockefeller-university) (rockefeller.edu)<br>A prestigious bioscience institution focused on uncovering life processes, leading to transformative medical breakthroughs with renowned faculty and cutting-edge facilities | Research Services | 🇺🇸 New York | 1,833 | 1901 |
| 50 | [National Physical Laboratory (NPL)](https://www.tamtam.ai/c/national-physical-laboratory-npl) (npl.co.uk)<br>The company is the UK's National Metrology Institute providing measurement capabilities to support technological advances, save lives, and ensure reliability | Research Services | 🇺🇸 Teddington | 1,821 | 1900 |
| 51 | [CNEA](https://www.tamtam.ai/c/cnea) (cnea.gov.ar)<br>An Argentinian governmental agency focused on developing and controlling nuclear energy for peaceful purposes, operating research centers and nuclear power stations | Research Services | 🇺🇸 Ciudad Autónoma de Buenos Aires | 1,807 | 1950 |
| 52 | [Intel Labs](https://www.tamtam.ai/c/intel-labs) (intel.com)<br>Leading research in computer science, fostering collaboration between academia and industry, and driving visionary thinking in technology, sciences, society, and culture | Research Services | 🇺🇸 Hillsboro | 1,658 | 1968 |
| 53 | [Forrester](https://www.tamtam.ai/c/forrester) (forrester.com)<br>Provides research, consulting, and events to help leaders use customer-focused insights and data to drive growth and navigate change. | Research Services | 🇺🇸 Cambridge | 1,653 | 1983 |
| 54 | [Altasciences](https://www.tamtam.ai/c/altasciences) (altasciences.com)<br>Offers pharmaceutical and biotechnology companies a proven, flexible, one-stop solution for early-phase drug development, from lead candidate selection to clinical proof of concept. | Research Services | 🇨🇦 Laval | 1,617 | 1992 |
| 55 | [NIH Innovates](https://www.tamtam.ai/c/nih-innovates) (nih.gov)<br>A federal agency focused on researching mental disorders, part of NIH Conducts basic and clinical research to prevent, treat, and cure mental illnesses | Research Services | 🇺🇸 Bethesda | 1,542 | 1949 |
| 56 | [Innovations for Poverty Action](https://www.tamtam.ai/c/innovations-for-poverty-action) (poverty-action.org)<br>A non-profit organization focusing on research and policy to find and promote effective solutions for global poverty issues | Research Services | 🇺🇸 Washington | 1,523 | 2002 |
| 57 | [CIMMYT](https://www.tamtam.ai/c/cimmyt) (cimmyt.org)<br>Cutting-edge non-profit organization dedicated to improving production systems for basic cereals in the Global South through applied agricultural science and strong partnerships | Research Services | 🇲🇽 Texcoco de Mora | 1,507 | 1943 |
| 58 | [Fish and Wildlife Research Institute](https://www.tamtam.ai/c/fish-and-wildlife-research-institute) (myfwc.com)<br>The company conducts research on ecosystem assessment and restoration, freshwater and marine fisheries, imperiled species, wildlife studies, and red tides They focus on information science and outreach | Research Services | 🇺🇸 St Petersburg | 1,499 |  |
| 59 | [Scripps Institution of Oceanography](https://www.tamtam.ai/c/scripps-institution-of-oceanography) (scripps.ucsd.edu)<br>A world-renowned institution focusing on ocean and earth science research, education, and public service across various disciplines | Research Services | 🇺🇸 La Jolla | 1,484 | 1903 |
| 60 | [WCG](https://www.tamtam.ai/c/wcg) (wcgclinical.com)<br>Industry leader in ethical review solutions for clinical research, optimizing quality, safety, and efficiency through data-driven insights and specialized solutions | Research Services | 🇺🇸 Cary | 1,463 |  |
| 61 | [Allen Institute](https://www.tamtam.ai/c/allen-institute) (alleninstitute.org)<br>An open science organization focused on advancing bioscience to improve human health through foundational research, developing standards, and fostering new ideas | Research Services | 🇺🇸 Seattle | 1,452 | 2003 |
| 62 | [IEEE Computer Society](https://www.tamtam.ai/c/ieee-computer-society) (computer.org)<br>Facilitating professional development and collaboration in computer science and engineering through conferences, publications, training, and resources for industry advancement | Research Services | 🇺🇸 Los Alamitos | 1,443 | 1946 |
| 63 | [Emmes Group](https://www.tamtam.ai/c/emmes-group) (theemmesgroup.com)<br>A company dedicated to advancing public health and biopharmaceutical innovation by combining human intelligence with artificial intelligence in clinical research | Research Services | 🇺🇸 Rockville | 1,411 | 2024 |
| 64 | [Cobb](https://www.tamtam.ai/c/cobb) (cobbgenetics.com)<br>This company promotes global poultry industry with high-quality genetics, innovative research, and worldwide distribution of healthy, affordable protein products | Research Services | 🇺🇸 Siloam Springs | 1,354 | 1916 |
| 65 | [Woods Hole Oceanographic Institution](https://www.tamtam.ai/c/woods-hole-oceanographic-institution) (whoi.edu)<br>A nonprofit organization dedicated to ocean research, engineering, and education, focused on advancing solutions for the planet's future | Research Services | 🇺🇸 Woods Hole | 1,330 | 1930 |
| 66 | [DECIEM \| THE ABNORMAL BEAUTY COMPANY](https://www.tamtam.ai/c/deciem-the-abnormal-beauty-company) (deciem.com)<br>A beauty brand umbrella offering high-quality, transparent skincare products, founded by a disrupter aiming to redefine beauty industry standards | Research Services | 🇨🇦 Toronto | 1,311 | 2013 |
| 67 | [Samsung Strategy and Innovation Center](https://www.tamtam.ai/c/samsung-strategy-and-innovation-center)<br>A technology innovation center fostering disruptive technologies, investing in startups, and expanding business lines through partnerships and acquisitions | Research Services | 🇺🇸 Menlo Park | 1,283 | 2013 |
| 68 | [Salk Institute for Biological Studies](https://www.tamtam.ai/c/salk-institute-for-biological-studies) (salk.edu)<br>World-class scientists conducting advanced research in neuroscience, cancer, aging, immunobiology, plant biology, and computational biology fields. | Research Services | 🇺🇸 La Jolla | 1,249 | 1960 |
| 69 | [WestEd](https://www.tamtam.ai/c/wested) (wested.org)<br>A national nonprofit agency promoting equity and excellence in education through research, development, and services, offering professional growth and benefits | Research Services | 🇺🇸 San Francisco | 1,237 | 1966 |
| 70 | [Emmes](https://www.tamtam.ai/c/emmes) (theemmesgroup.com)<br>A global Contract Research Organization (CRO) with expertise in clinical research across various therapeutic areas, supporting public health and biopharmaceutical innovation | Research Services | 🇺🇸 Rockville | 1,188 |  |
| 71 | [New Mexico Institute of Mining and Technology](https://www.tamtam.ai/c/new-mexico-institute-of-mining-and-technology) (nmt.edu)<br>A leading research university specializing in science, engineering, mathematics, and entrepreneurship, offering undergraduate and graduate degrees in various fields | Research Services | 🇺🇸 Socorro | 1,179 | 1889 |
| 72 | [CTI Clinical Trial and Consulting Services](https://www.tamtam.ai/c/cti-clinical-trial-and-consulting-services) (ctifacts.com)<br>A global full-service CRO specializing in rare diseases and critical patient populations, offering clinical trial and consulting services worldwide | Research Services | 🇺🇸 Covington | 1,139 | 1999 |
| 73 | [AI at Meta](https://www.tamtam.ai/c/ai-at-meta) (ai.meta.com)<br>Advancing AI through open science and collaboration, focusing on infrastructure, NLP, generative AI, vision, and human-computer interaction. | Research Services | 🇺🇸 Menlo Park | 1,101 |  |
| 74 | [RI-MUHC \| Research Institute of the MUHC \| #rimuhc](https://www.tamtam.ai/c/ri-muhc-research-institute-of-the-muhc-rimuhc) (rimuhc.ca)<br>The Research Institute of the McGill University Health Centre accelerates biomedical research to improve human health for both pediatric and adult programs | Research Services | 🇨🇦 Montreal | 1,084 |  |
| 75 | [U.S. Army Engineer Research and Development Center (ERDC)](https://www.tamtam.ai/c/u-s-army-engineer-research-and-development-center-erdc) (erdc.usace.army.mil)<br>A research and development center for the US Army Corps of Engineers, specializing in diverse engineering areas and top-ranked facilities worldwide | Research Services | 🇺🇸 Vicksburg | 1,052 | 1999 |
| 76 | [Navitas Life Sciences](https://www.tamtam.ai/c/navitas-life-sciences) (navitaslifesciences.com)<br>Global clinical research organization providing technology-driven CRO services, data science, regulatory support, and industry-focused consulting to biopharmaceutical clients worldwide | Research Services | 🇺🇸 Gaithersburg | 1,014 |  |
| 77 | [Duke Clinical Research Institute](https://www.tamtam.ai/c/duke-clinical-research-institute) (dcri.org)<br>A global leader in clinical research, conducting groundbreaking trials, managing patient registries, and publishing impactful research to improve healthcare quality | Research Services | 🇺🇸 Durham | 1,009 | 1969 |
| 78 | [UT Southwestern Careers](https://www.tamtam.ai/c/ut-southwestern-careers) (utsouthwestern.edu)<br>A leading academic medical center with top faculty conducting groundbreaking research, providing exceptional patient care, and offering advanced medical education | Research Services | 🇺🇸 Dallas | 1,000 | 1943 |
| 79 | [National Institute for Aviation Research](https://www.tamtam.ai/c/national-institute-for-aviation-research) (wichita.edu)<br>An aviation research center at Wichita State University providing design, testing, certification, and training to the aviation, defense, and manufacturing industries | Research Services | 🇺🇸 Wichita | 991 | 1985 |
| 80 | [Cold Spring Harbor Laboratory](https://www.tamtam.ai/c/cold-spring-harbor-laboratory) (cshl.edu)<br>Global leader research education. Provides unique stimulating atmosphere doctoral research. Innovative curriculum trains independent thinkers. | Research Services | 🇺🇸 Cold Spring Harbor | 985 | 1890 |
| 81 | [Sarah Cannon Research Institute](https://www.tamtam.ai/c/sarah-cannon-research-institute) (scri.com)<br>A leading oncology research organization conducting community-based clinical trials, advancing therapies and enhancing trial access across the country | Research Services | 🇺🇸 Nashville | 975 | 1993 |
| 82 | [El Colegio de México](https://www.tamtam.ai/c/el-colegio-de-mexico) (colmex.mx)<br>A public university institution in Mexico dedicated to research and higher education in social sciences and humanities, as well as publishing related materials | Research Services | 🇲🇽 Mexico City | 975 | 1940 |
| 83 | [USAMRIID — U.S. Army Medical Research Institute of Infectious Diseases](https://www.tamtam.ai/c/usamriid-u-s-army-medical-research-institute-of-infectious-diseases) (health.mil)<br>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 | Research Services | 🇺🇸 Frederick | 968 | 1969 |
| 84 | [PARC](https://www.tamtam.ai/c/parc-palo-alto) (sri.com)<br>Innovative research institute in Silicon Valley with deep impact on technology, now leading open innovation and developing groundbreaking technologies and ideas | Research Services | 🇺🇸 Palo Alto | 962 |  |
| 85 | [European Southern Observatory](https://www.tamtam.ai/c/european-southern-observatory) (eso.org)<br>Provides advanced astronomical research facilities and operates powerful ground-based telescopes across multiple sites in Chile for scientific discoveries. | Research Services | 🇨🇦 Garching bei Muenchen | 953 | 1962 |
| 86 | [CenExel](https://www.tamtam.ai/c/cenexel) (cenexelresearch.com)<br>Specializing in clinical research, the network offers support for a variety of indications to help make your clinical trial successful | Research Services | 🇺🇸 Salt Lake City | 935 | 2018 |
| 87 | [Beroe Inc](https://www.tamtam.ai/c/beroe-inc) (beroeinc.com)<br>Providing procurement insights and AI-driven data solutions to help organizations make faster, smarter decisions and mitigate supply risks effectively. | Research Services | 🇺🇸 Raleigh | 932 | 2006 |
| 88 | [International Food Policy Research Institute (IFPRI)](https://www.tamtam.ai/c/international-food-policy-research-institute-ifpri) (ifpri.org)<br>A research institute focused on sustainable solutions to end hunger and poverty worldwide through evidence-based research in a collaborative environment | Research Services | 🇺🇸 Washington | 924 | 1975 |
| 89 | [Institute for Health Metrics and Evaluation](https://www.tamtam.ai/c/institute-for-health-metrics-and-evaluation) (healthdata.org)<br>An independent global health research center providing rigorous measurement of health problems and evaluating strategies to improve population health | Research Services | 🇺🇸 Seattle | 904 | 2007 |
| 90 | [GE Research](https://www.tamtam.ai/c/ge-research) (geaerospace.com)<br>Innovative engine creating differentiated products for aviation, power, transportation, and healthcare sectors Legacy of transformative innovation continues through interdisciplinary research | Research Services | 🇺🇸 Niskayuna | 904 | 1892 |
| 91 | [National Institute of Environmental Health Sciences (NIEHS)](https://www.tamtam.ai/c/national-institute-of-environmental-health-sciences-niehs) (niehs.nih.gov)<br>The organization based in North Carolina conducts research on how the environment impacts human health to improve overall well-being | Research Services | 🇺🇸 Research Triangle Park | 901 | 1966 |
| 92 | [NSF NCAR - The National Center for Atmospheric Research](https://www.tamtam.ai/c/nsf-ncar-the-national-center-for-atmospheric-research) (ncar.ucar.edu)<br>Advancing research and services in meteorology, climate science, environmental science, and STEM education, fostering collaboration and understanding of Earth's systems | Research Services | 🇺🇸 Boulder | 897 |  |
| 93 | [Population Council](https://www.tamtam.ai/c/population-council) (popcouncil.org)<br>A research organization focused on creating a better world through evidence-based solutions to improve the lives of underserved populations globally | Research Services | 🇺🇸 New York | 877 |  |
| 94 | [Jefferson Lab](https://www.tamtam.ai/c/jefferson-lab) (jlab.org)<br>A national accelerator facility in Virginia, leading research into quarks, gluons, and superconducting technology while advancing data analysis capabilities for research | Research Services | 🇺🇸 Newport News | 875 | 1984 |
| 95 | [Rollins School of Public Health at Emory University](https://www.tamtam.ai/c/rollins-school-of-public-health-at-emory-university) (sph.emory.edu)<br>A top-ranked public health school offering master's and doctorate degrees, interdisciplinary research, and unique dual-degree programs with Emory University schools | Research Services | 🇺🇸 Atlanta | 869 |  |
| 96 | [Savannah River National Laboratory](https://www.tamtam.ai/c/savannah-river-national-laboratory) (srnl.gov)<br>A multidisciplinary research center solving environmental and security challenges by applying science to global security, energy, and environmental cleanup | Research Services | 🇺🇸 Aiken | 865 | 1951 |
| 97 | [Care Access](https://www.tamtam.ai/c/care-access) (careaccess.com)<br>Global research site facilitating access to clinical research to increase availability of new treatments in communities worldwide | Research Services | 🇺🇸 Boston | 860 | 2015 |
| 98 | [HRL Laboratories, LLC](https://www.tamtam.ai/c/hrl-laboratories-llc) (hrl.com)<br>Leading research laboratory focused on groundbreaking technology solutions in circuitry, computing, materials, and data extraction for diverse applications in aerospace, automotive, and consumer products | Research Services | 🇺🇸 Malibu | 860 | 1997 |
| 99 | [University of Dayton Research Institute](https://www.tamtam.ai/c/university-of-dayton-research-institute) (udayton.edu)<br>A national leader in scientific and engineering research providing innovative solutions in materials, energy, aeropropulsion, and more with integrity and commitment | Research Services | 🇺🇸 Dayton | 855 | 1956 |
| 100 | [Eurofins \| EAG Laboratories](https://www.tamtam.ai/c/eurofins-eag-laboratories) (eag.com)<br>A scientific services company specializing in advanced materials and integrated circuitry analysis, offering problem-solving expertise to accelerate innovation and ensure quality and compliance | Research Services | 🇺🇸 San Diego | 818 | 1978 |

## 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 14, 2026.

## More company lists in North America

- [The largest companies in North America](https://www.tamtam.ai/l/largest-companies-in-north-america) (119,527)
- [Multinational companies in North America](https://www.tamtam.ai/l/multinational-companies-in-north-america) (18,654)
- [Manufacturers in North America](https://www.tamtam.ai/l/manufacturers-in-north-america) (10,135)
- [Education providers in North America](https://www.tamtam.ai/l/education-companies-in-north-america) (8,464)
- [Retail chains in North America](https://www.tamtam.ai/l/retail-chains-in-north-america) (8,234)
- [Financial services firms in North America](https://www.tamtam.ai/l/financial-services-firms-in-north-america) (7,767)
- [Companies with in-house R&D in North America](https://www.tamtam.ai/l/r-and-d-companies-in-north-america) (7,617)
- [Critical infrastructure operators in North America](https://www.tamtam.ai/l/critical-infrastructure-operators-in-north-america) (6,768)
- [Hardware manufacturers in North America](https://www.tamtam.ai/l/hardware-companies-in-north-america) (5,983)
- [Financial Services companies in North America](https://www.tamtam.ai/l/financial-services-companies-in-north-america) (5,618)
- [Public sector organisations in North America](https://www.tamtam.ai/l/public-sector-organisations-in-north-america) (5,042)
- [Higher Education companies in North America](https://www.tamtam.ai/l/higher-education-companies-in-north-america) (3,953)
- [Construction companies in North America](https://www.tamtam.ai/l/construction-companies-in-north-america) (3,792)
- [Energy companies in North America](https://www.tamtam.ai/l/energy-companies-in-north-america) (3,542)
- [Publicly traded companies in North America](https://www.tamtam.ai/l/publicly-traded-companies-in-north-america) (3,538)
- [Family-owned companies in North America](https://www.tamtam.ai/l/family-owned-companies-in-north-america) (3,387)
- [Corporate groups and holding companies in North America](https://www.tamtam.ai/l/holding-companies-in-north-america) (3,311)
- [Distributors and wholesalers in North America](https://www.tamtam.ai/l/distributors-and-wholesalers-in-north-america) (3,208)
- [Hotel and hospitality groups in North America](https://www.tamtam.ai/l/hospitality-groups-in-north-america) (3,149)
- [E-commerce companies in North America](https://www.tamtam.ai/l/ecommerce-companies-in-north-america) (2,945)
- [Logistics companies in North America](https://www.tamtam.ai/l/logistics-companies-in-north-america) (2,701)
- [Insurance companies in North America](https://www.tamtam.ai/l/insurance-companies-in-north-america) (2,622)
- [Government Administration companies in North America](https://www.tamtam.ai/l/government-administration-companies-in-north-america) (2,495)
- [Retail companies in North America](https://www.tamtam.ai/l/retail-companies-in-north-america) (2,408)

## The same list elsewhere

- [Research Services companies in the world](https://www.tamtam.ai/l/research-services-companies-in-the-world) (2,651)
- [Research Services companies in the United States](https://www.tamtam.ai/l/research-services-companies-united-states) (399)
- [Research Services companies in Canada](https://www.tamtam.ai/l/research-services-companies-canada) (61)

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Source: https://www.tamtam.ai/l/research-services-companies-in-north-america