| # | Company | Employees |
|---|---|---|
| 1 |
Marriott Internationalmarriott.com
Management and operation of approximately 9,000 hotels and resorts across more than 30 brands in 141 countries worldwide. |
240,261 |
| 2 |
Sikorsky Aircraft Corporationlockheedmartin.com
Global security and aerospace company providing integrated solutions and predictive technologies to keep customers ahead of threats through advanced technology systems and services |
115,000 |
| 3 |
Marriott Hotelsmarriott-hotels.marriott.com
Global full-service hotels and resorts offering consistent guest experiences, functional room designs, international dining, gold standard event spaces, and extensive fitness facilities. |
44,250 |
| 4 | 40,000 | |
| 5 |
The National Institutes of Healthnih.gov
Largest public funder of biomedical research investing billions annually to improve health, reduce illness, and support medical breakthroughs worldwide. |
28,537 |
| 6 |
Sheraton Hotels & Resortssheraton.marriott.com
Global hospitality services providing innovative travel connections across hundreds of communities in over seventy countries for both local visitors and international travelers. |
21,082 |
| 7 |
The Ritz-Carlton Hotel Company, L.L.C.ritzcarlton.com
Global hospitality provider delivering premium hotel services and community outreach programs guided by a rigorous corporate philosophy and commitment to gold standard excellence. |
18,565 |
| 8 |
Education Weekedweek.org
This company provides K-12 news, analysis, and opinion to empower individuals to make a difference in their community, while enforcing community guidelines for respectful interactions |
10,268 |
| 9 |
Westin Hotels & Resortswestin.marriott.com
Provides signature wellness programs across over two hundred global locations for travelers to eat, sleep, move, feel, work and play well. |
8,533 |
| 10 |
Total Wine & Moretotalwine.com
Retailer offering extensive selection of wines, beers, and spirits with commitment to low prices and excellent customer service. |
5,550 |
| 11 |
National Cancer Institute (NCI)cancer.gov
Leading federal agency for cancer research, part of the National Institutes of Health Visit wwwcancergov for more information Privacy policy available |
5,247 |
| 12 | 3,623 | |
| 13 |
Precision Medicine Groupprecisionmedicinegrp.com
A company founded in 2012 focused on improving the drug development process through technology, data, human expertise, and strategic acquisitions |
3,553 |
| 14 |
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 |
| 15 |
Aloft Hotelsaloft-hotels.marriott.com
Aloft hotels offer unique, contemporary spaces with vibrant social scenes and innovative programming for the next generation of global travelers |
3,090 |
| 16 |
Renaissance Hotelsmarriott.com
Luxury hotel chain focused on unique design, neighborhood experiences, and local immersion, encouraging guests to discover hidden gems at each location |
3,031 |
| 17 |
Management Leadership for Tomorrowmlt.org
Non-profit organization accelerating diverse talent pipelines through coaching, networking, and equity certifications, connecting top minority talent with leading corporations and business schools |
2,663 |
| 18 |
AC Hotels by Marriottac-hotels.marriott.com
AC Hotels by Marriott offers stylish, modern accommodations with a focus on essentials, European-inspired breakfast, flexible dining options, and a unique urban experience for travelers worldwide |
2,570 |
| 19 |
Gaylord Hotelsgaylordhotels.com
A leader in the meeting and resort hotels industry, offering guests convenient access to dining, spa, entertainment, shopping, activities, and meetings expertise |
2,290 |
| 20 |
Precision For Medicineprecisionformedicine.com
A global precision medicine clinical research organization improving therapeutics development with integrated clinical operations, laboratory expertise, and advanced data sciences |
2,060 |
| 21 |
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 |
| 22 |
Walter Reed National Military Medical Centerwalterreed.tricare.mil
Largest joint military medical center providing specialized healthcare, education, research, and operational readiness for wounded and ill military beneficiaries. |
1,920 |
| 23 |
Aledade, Inc.aledade.com
Support independent primary care practices with data analytics, care solutions, and value-based contracts to improve patient health and financial success. |
1,910 |
| 24 |
Uniformed Services Universityusuhs.edu
A federal health sciences university training healthcare professionals to support the Military Health System Disclosures: Follows, likes, reposts do not equal endorsement |
1,893 |
| 25 |
Admiral Security Servicesadmiralsecurity.com
Admiral Security Services offers professional armed and unarmed security officers, superior site management, and unwavering corporate support with high integrity and cost efficiency |
1,765 |
| 26 |
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 |
| 27 |
Walker & Dunlopwalkerdunlop.com
Creating communities with ideas and capital, specializing in commercial real estate finance and advisory services for living, working, shopping, and playing |
1,493 |
| 28 |
Suburban Hospitalhopkinsmedicine.org
A non-profit hospital in Maryland, offering cutting-edge medical services and distinguished stroke, trauma, cardiac, orthopedic, neuroscience, and oncology programs |
1,328 |
| 29 |
Global Communitiesglobalcommunities.org
An international non-profit organization collaborates with communities worldwide to implement sustainable changes that enhance the lives of vulnerable populations through partnership and shared responsibility |
1,211 |
| 30 |
Cystic Fibrosis Foundationcff.org
Nonprofit dedicated to finding a cure and improving lives for those with cystic fibrosis through research, care, and advocacy for better health experiences and outcomes. |
1,152 |
| 31 | 1,147 | |
| 32 |
Auberge Collectionaubergeresorts.com
Luxury hotel company with 25 resorts and 9 more in development, offering unique design, exceptional cuisine, spas, and top-notch service worldwide |
1,096 |
| 33 |
DARCARS Automotive Groupdarcars.com
A leading automotive group with 42 franchises across multiple states, consistently ranked on Forbes 500 list, emphasizing extraordinary customer satisfaction and community impact |
947 |
| 34 |
Haagen Dazshaagen-dazs.com
A food & beverages company located in Bethesda, Maryland, offering high-quality products for indulgent cravings and sweet treats |
893 |
| 35 |
Liquidity Servicesliquidityservices.com
Operates a global B2B e-commerce platform connecting corporate and government sellers with millions of buyers to trade surplus assets sustainably. |
892 |
| 36 |
Victorvictorinsurance.com
A global managing general underwriter specializing in evaluating risks, underwriting policies, and providing outstanding service through exclusive carrier partnerships |
890 |
| 37 |
CareMetx, LLCcaremetx.com
providing high-touch support and digital benefit investigation to accelerate patient initiation and adherence for specialty therapies |
845 |
| 38 |
citizenM hotelsmarriott.com
An integrated hotel brand catering to modern urban travellers, offering stylish, affordable accommodations in prime city locations with high profitability |
831 |
| 39 |
Envivaenvivabiomass.com
The company is the world's largest sustainable wood pellet producer, exporting to reduce greenhouse gas emissions in various sectors worldwide |
789 |
| 40 |
Centrus Energy Corp.centrusenergy.com
A trusted supplier of nuclear fuel and services, specializing in providing clean, affordable, and carbon-free electricity to utility customers worldwide |
713 |
| 41 |
The Luxury Collectionthe-luxury-collection.marriott.com
Curating unforgettable experiences in over 35 countries through a collection of 120+ unique luxury hotels, each offering transformative, story-worthy moments |
712 |
| 42 | 699 | |
| 43 |
Collage Groupcollagegroup.com
Cultural intelligence company supporting US brands in leveraging culture to drive growth by providing consumer insights, data, tools, and best practices |
684 |
| 44 |
Offit Kurmanoffitkurman.com
Full-service law firm specializing in 30+ areas of practice, providing innovative counsel to businesses, individuals, and families to maximize and protect value |
676 |
| 45 |
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 |
| 46 |
JBG SMITHjbgsmith.com
A leading real estate company in the Washington, DC market, offering diverse mixed-use properties, leveraging experience, scale, and innovation to impact communities |
668 |
| 47 |
EagleBankeaglebankcorp.com
A local community business bank in Maryland, Northern Virginia, and DC, offering superior customer service and custom financial solutions for businesses and individuals |
653 |
| 48 |
National Heart, Lung, and Blood Institutenhlbi.nih.gov
A global leader in research, training, and education to prevent and treat heart, lung, and blood diseases, promoting longer, fulfilling lives |
631 |
| 49 |
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 |
| 50 |
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 |
| 51 |
PDA - Parenteral Drug Associationpda.org
A global provider of science, technology, and regulatory information for the pharmaceutical and biopharmaceutical industry, committed to advancing science and regulation |
520 |
| 52 |
APHL - Association of Public Health Laboratoriesaphl.org
The company strengthens public health laboratory systems by detecting diseases, environmental contaminants, genetic disorders, and other health threats globally and in the US |
517 |
| 53 |
Bach to Rock: America's Music Schoolbachtorock.com
Music school offering unique method combining individual lessons with band instruction, jam sessions, Battles of the Bands, recording studios, and public concerts to cultivate musicianship |
514 |
| 54 |
Meridian Senior Livingmeridiansenior.com
Meridian Senior Living provides personalized care and services for residents across the United States, focusing on improving quality of life |
498 |
| 55 |
Employee Navigatoremployeenavigator.com
Simplify benefits and HR tasks for brokers and HR departments with an all-in-one solution, used by 50,000+ companies and 6,000,000+ employees |
476 |
| 56 |
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 |
| 57 |
The Centers for Advanced Orthopaedicscfaortho.com
A leading provider of orthopaedic care in the Mid-Atlantic, offering personalized service, superior care, and a wide range of insurance options |
465 |
| 58 |
ESIesi-dc.com
Professional services firm based in Bethesda, MD, serving Federal Government and other sectors since 1990 Offers exceptional value with expertise and capacity |
453 |
| 59 | 447 | |
| 60 |
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 |
| 61 |
Get Wellgetwellnetwork.com
Specializing in digital patient engagement, they aim to improve healthcare outcomes by providing personalized technology solutions for hospitals and health systems |
416 |
| 62 |
U.S. Consumer Product Safety Commissioncpsc.gov
An organization dedicated to protecting the public from risks of injury or death from consumer products through regulation and safety measures |
412 |
| 63 |
National Center for Biotechnology Information (NCBI)ncbi.nlm.nih.gov
International resource providing access to public biological databases and software tools for data analysis, performing computational biology research, archiving, and advancing understanding of health and disease. |
388 |
| 64 |
Red Coats, Inc.redcoats.com
A leading custodial service company, providing professional cleaning services to millions of square feet of residential, commercial, industrial, and institutional spaces daily |
384 |
| 65 |
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 |
| 66 |
MidCap Financialmidcapfinancial.com
Provides senior debt financing solutions to middle-market companies across various industries, managing approximately $60 billion in commitments. |
379 |
| 67 |
Wellness Corporate Solutions, LLClabcorp.com
Provider of comprehensive well-being solutions and insights, including COVID-19 return to work solutions, biometric screenings, health coaching, and analytics for employers and health consumers |
377 |
| 68 |
PPDโข Evideraโข 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 |
| 69 |
Marketbridgemarketbridge.com
Global team providing unified Go-to-Market systems through strategy, AI, creativity, and measurement for Fortune 50 companies and venture-backed brands across multiple sectors. |
371 |
| 70 |
HiLabshilabs.com
This company provides technology solutions for health plans to optimize member experiences, increase efficiency, and convert data into actionable insights |
349 |
| 71 |
Federal Occupational Healthhhs.gov
An established agency offering comprehensive administrative services to the US government, including finance, procurement, real estate, logistics, and occupational health |
346 |
| 72 |
Host Hotels & Resortshosthotels.com
Owns luxury and upper-upscale hotels as a lodging real estate investment trust in top U.S. markets, focusing on responsible asset management. |
342 |
| 73 |
Spatial Front, Incspatialfront.com
Delivering IT solutions and business support services with strategic planning, precise execution, and commitment to excellence Certified in SBA 8(a), WOSB, CMMI L3, and ISO 9001 |
337 |
| 74 |
Eunice Kennedy Shriverย 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 |
| 75 |
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 |
| 76 |
U.S. Financial Technologyusfintech.com
This company operates a mortgage securitization platform for Fannie Mae and Freddie Mac, providing issuance, administration, disclosure, and tax services |
330 |
| 77 |
ISNisncorp.com
A nationwide provider of specialized professional services to Federal government agencies, focused on quality, timeliness, integrity, and eliminating fraud, waste, and abuse through technology-based solutions |
329 |
| 78 |
Technical Resources International, Inc.tech-res.com
A certified Hispanic woman-owned organization providing product development support services to the global drug, biologic, vaccine, medical device, and health sector communities |
318 |
| 79 |
GIAC Certificationsgiac.org
Offers over 30 information security certifications, validating hands-on skills for professionals, practitioners, and developers across offensive, defensive, management, audit, forensics, and software security. |
318 |
| 80 |
Manhattan Strategy Groupmanhattanstrategy.com
A boutique research and consulting firm specializing in helping government and commercial clients achieve performance excellence through custom solutions and expert analysis |
313 |
| 81 |
RE/MAX Realty Servicesrealtyserviceexperts.com
A real estate company dedicated to providing high-quality service, achieving excellent results, and offering a variety of convenient services to agents and clients |
264 |
| 82 | 240 | |
| 83 |
Democracy Internationaldemocracyinternational.com
This company supports active citizens, responsive governments, and engaged civil society to promote democracy, human rights, and governance worldwide |
225 |
| 84 |
Datawatch Systemsdatawatchsystems.com
Provides managed access control and emergency management solutions, remotely monitoring doors and credentials to protect properties and people nationwide. |
222 |
| 85 |
GoIndustry DoveBidgo-dove.com
Global leader in surplus asset management, industrial auctions, and valuation services, helping businesses optimize ROI through asset sales, management, and sustainability solutions |
218 |
| 86 |
B. F. Saul Company Hospitality Groupbfsaulhotels.com
Hospitality subsidiary of a private real estate and banking concern, operating a portfolio of branded hotels and conference facilities in three states |
212 |
| 87 |
Bernstein Management Corporationbmcproperties.com
Real estate management, investment, and development company with a portfolio of 80+ properties in Washington DC, Maryland, and Virginia Prioritizing integrity, service, and innovation |
202 |
| 88 |
Rapid Financerapidfinance.com
Provides fast, flexible online funding solutions to small and medium-sized businesses and enterprise solutions to help lenders serve small business borrowers. |
200 |
| 89 |
Chevy Chase Trustchevychasetrust.com
Independent investment management firm providing personalized financial planning and diversified portfolios to individuals, families, and select institutions, with a focus on maximizing client wealth |
192 |
| 90 |
Stone Ridge School of the Sacred Heartstoneridgeschool.org
A Catholic, college preparatory school for girls with a co-ed early childhood program, part of a global network promoting faith, academics, social awareness, and community |
186 |
| 91 | 184 | |
| 92 |
Advanced Research Projects Agency for Health (ARPA-H)arpa-h.gov
A government agency focused on solving complex health challenges through innovative research programs, aiming to empower all Americans to achieve optimal health |
178 |
| 93 |
Greysteelgreysteel.com
Leading commercial real estate advisory firm serving private, middle-market, and institutional investors, offering tailored solutions through deep market intelligence and disciplined approach. |
177 |
| 94 |
elite personnelelitepersonnel.com
A full-service recruitment firm with over 35 years of experience providing top-notch personnel for Direct Hire, Temp-to-Hire, Temporary, and Contract staff |
175 |
| 95 |
American Gastroenterological Association (AGA)gastro.org
A global organization representing over 16,000 members in the field of gastroenterology, focusing on practice, research, and education in the area |
174 |
| 96 |
ProSharesproshares.com
A leading provider of ETFs, offering innovative products to manage risk and enhance returns since 2006 Visit their website for more information |
173 |
| 97 |
Rochambeau, The French International Schoolrochambeau.org
A bilingual, bicultural school in Bethesda MD with 3 campuses, educating students from PreK to 12th grade with a strong academic focus on French National Curriculum |
171 |
| 98 |
Imagination Stage, Inc.imaginationstage.org
A multi-disciplinary theatre arts organization offering professional shows, classes, summer camps, and teacher training focusing on inclusivity and accessibility for children |
162 |
| 99 |
Healthy Directionshealthydirections.com
Direct-to-consumer retailer and health publisher offering doctor-formulated supplements and skincare products from respected integrative health experts |
159 |
| 100 |
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 |
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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 Oct 24, 2026.
The same list elsewhere in United States
- The largest companies in the United States 91,669
- The largest companies in California 12,813
- The largest companies in New York State 10,485
- The largest companies in Texas 8,086
- The largest companies in Florida 4,945
- The largest companies in Illinois 4,175
- The largest companies in Pennsylvania 3,110
- The largest companies in Massachusetts 3,093
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
- The largest companies in Michigan 2,346
- The largest companies in North Carolina 2,174
- The largest companies in Alabama 1,806
- The largest companies in Washington State 1,785
- The largest companies in Colorado 1,774
- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
- The largest companies in Wisconsin 1,482
- The largest companies in New York 6,920
- The largest companies in San Francisco 2,030
- The largest companies in Houston 1,791
- The largest companies in Chicago 1,668