The 100 largest companies in Maryland (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Marriott International marriott.com Management and operation of approximately 9,000 hotels and resorts across more than 30 brands in 141 countries worldwide.	Hospitality	🇺🇸 Bethesda	240,261	n/a
2	Social Security Administration ssa.gov A government agency providing financial protection and support through retirement, disability, and survivors benefits to over 64 million individuals and families nationwide	Government Administration	🇺🇸 Baltimore	47,537	1935
3	Marriott Hotels marriott-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.	Hospitality	🇺🇸 Bethesda	44,250	n/a
4	Johns Hopkins Medicine hopkinsmedicine.org Coordinates research, teaching, patient care, and related enterprises for the university's School of Medicine and health system, including hospitals and healthcare practices.	Hospitals and Health Care	🇺🇸 Baltimore	39,325	n/a
5	The National Institutes of Health nih.gov Largest public funder of biomedical research investing billions annually to improve health, reduce illness, and support medical breakthroughs worldwide.	Biotechnology Research	🇺🇸 Bethesda	28,537	1887
6	TEKsystems teksystems.com Global solutions provider specializing in accelerating business transformation through resolving technology, business, and talent challenges for Fortune 500 organizations	IT Services and IT Consulting	🇺🇸 Hanover	28,131	1983
7	Goodwill Industries International goodwill.org nonprofit organization providing education, training, and career services to disadvantaged individuals and people with disabilities for empowerment.	Non-profit Organizations	🇺🇸 Rockville	24,004	1902
8	University of Maryland umd.edu Public research university emphasizing hands-on learning, interdisciplinary collaboration, innovation, entrepreneurship, and global citizenship through diverse academic and research opportunities.	Higher Education	🇺🇸 College Park	21,670	n/a
9	Sheraton Hotels & Resorts sheraton.marriott.com Global hospitality services providing innovative travel connections across hundreds of communities in over seventy countries for both local visitors and international travelers.	Hospitality	🇺🇸 Bethesda	21,082	1937
10	Aerotek aerotek.com Aerotek provides staffing and services solutions for various industries, helping companies and careers evolve to overcome challenges in North American industry	Staffing and Recruiting	🇺🇸 Hanover	20,490	1983
11	Amergis Healthcare Staffing amergis.com Healthcare staffing agency offering opportunities and solutions for various healthcare professionals and organizations with a personalized approach and exceptional service	Staffing and Recruiting	🇺🇸 Columbia	19,829	1988
12	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.	Hospitality	🇺🇸 Bethesda	18,565	1983
13	The Johns Hopkins University jhu.edu Leading research university offering diverse academic programs across multiple campuses, fostering innovation and improving lives through education and discovery.	Higher Education	🇺🇸 Baltimore	18,221	n/a
14	FDA fda.gov Agency safeguards public health by ensuring human, veterinary drugs, biologics, medical devices, food, cosmetics, radiation-emitting products, tobacco products, all safe and effective.	Government Administration	🇺🇸 Silver Spring	17,527	n/a
15	Maxim Healthcare Staffing maximhealthcare.com A national healthcare staffing agency connecting top professionals with various partners, offering career opportunities in nursing, allied health, locum tenens, and more	Staffing and Recruiting	🇺🇸 Columbia	16,382	1988
16	Montgomery County Public Schools montgomeryschoolsmd.org A large school district in Maryland serving over 160,000 students, offering competitive salaries, benefits, and a commitment to diversity Hiring for excellence	Primary and Secondary Education	🇺🇸 Rockville	16,138	n/a
17	University of Maryland Medical System umms.org Multi-hospital system providing trauma, cancer, neuro, cardiac, women's, children's health, rehabilitation, and kidney transplant services across Maryland and beyond.	Hospitals and Health Care	🇺🇸 Baltimore	15,960	1984
18	Transamerica transamerica.com Empowering financial professionals and employers to help clients and employees plan for a multi-stage life and live their best life	Financial Services	🇺🇸 Baltimore	15,687	1904
19	Infinite Computer Solutions infinite.com Global provider of technology modernization, digital engineering, and AI-driven IT services delivering tailored solutions across multiple industries worldwide.	IT Services and IT Consulting	🇺🇸 Rockville	14,901	2001
20	Johns Hopkins Hospital hopkinsmedicine.org Leading hospital providing expert patient care, emergency services, and specialized medical support to local and international patients.	Hospitals and Health Care	🇺🇸 Baltimore	14,032	1889
21	McCormick & Company mccormickcorporation.com A global leader in flavor, McCormick manufactures and distributes spices, seasonings, and other flavorful products to the food industry worldwide	Food and Beverage Manufacturing	🇺🇸 Hunt Valley	14,000	1889
22	Prince George's County Public Schools pgcps.org Large school district with diverse student population offering innovative programs like arts integration, environmental literacy, and language immersion in the DC suburbs	Primary and Secondary Education	🇺🇸 Upper Marlboro	13,633	n/a
23	Constellation constellationenergy.com Leader in clean energy production and services, accelerating transition to carbon-free future through diverse energy portfolio, sustainability initiatives, and technology investments	Utilities	🇺🇸 Baltimore	13,291	n/a
24	Under Armour underarmour.com Design and develop innovative performance apparel, footwear, and gear focused on enhancing athletes' training, competition, and recovery experiences.	Retail Apparel and Fashion	🇺🇸 Baltimore	13,004	1996
25	Baltimore County Public Schools bcps.org A large school system serving over 113,000 students, dedicated to fostering lifelong learners through a focus on literacy	Primary and Secondary Education	🇺🇸 Towson	11,202	n/a
26	T. Rowe Price troweprice.com Global asset management organization providing equity, fixed income, and multi-asset solutions through rigorous research and active investing for individuals, advisors, and institutional clients.	Financial Services	🇺🇸 Baltimore	11,000	1937
27	Ciena ciena.com Global leader in optical and routing systems, services, and automation software, building adaptive networks to meet digital demands with innovation and collaboration	Telecommunications	🇺🇸 Hanover	10,652	1992
28	State of Maryland jobapscloud.com This company offers various opportunities for full-time, part-time, contractual, internship, and seasonal positions in public service in the state of Maryland	Government Administration	🇺🇸 Baltimore	10,542	1634
29	Bon Secours bonsecours.com Not-for-profit Catholic health system operating hospitals, senior housing, home care, and hospice services across seven states on East Coast.	Hospitals and Health Care	🇺🇸 Marriottsville	10,384	n/a
30	Education Week edweek.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	Internet News	🇺🇸 Bethesda	10,268	n/a
31	MedStar Health medstarhealth.org Not-for-profit health system providing medical care, education, research, and training with a patient-first approach in Maryland and Washington, D.C.	Hospitals and Health Care	🇺🇸 Columbia	10,037	1999
32	United States Department of the Navy navy.mil This organization is part of the Navy and is involved in activities related to naval operations, defense, and national security	Defense and Space Manufacturing	🇺🇸 Patuxent River	9,503	1950
33	Music & Arts musicarts.com A pioneering music retailer and lesson provider with over 500 locations, offering instruments, lessons, rentals, and repairs for musicians nationwide	Retail Musical Instruments	🇺🇸 Frederick	8,827	1952
34	Westin Hotels & Resorts westin.marriott.com Provides signature wellness programs across over two hundred global locations for travelers to eat, sleep, move, feel, work and play well.	Hospitality	🇺🇸 Bethesda	8,533	n/a
35	Perdue Farms corporate.perduefarms.com A fourth-generation, family-owned US food and agriculture business offering premium protein products through responsible practices and a focus on animal welfare	Food and Beverage Manufacturing	🇺🇸 Salisbury	8,392	1920
36	Baltimore City Public Schools baltimorecityschools.org A public school system in Baltimore, serving nearly 75,000 students through 164 schools and programs with a focus on literacy and student success	Primary and Secondary Education	🇺🇸 Baltimore	8,279	n/a
37	Giant Food giantfood.com A company offering rewarding, fast-paced opportunities for growth in retail, distribution, and corporate roles, with a focus on employee wellness and advancement	Retail	🇺🇸 Hyattsville	8,251	1936
38	Johns Hopkins Applied Physics Laboratory jhuapl.edu University-affiliated research center providing technical expertise, prototyping, research, development, and analysis for national security and scientific challenges.	Defense and Space Manufacturing	🇺🇸 Laurel	7,850	1942
39	Catholic Relief Services crs.org An international humanitarian agency providing assistance to people in need in over 100 countries, with high efficiency and transparency	Non-profit Organizations	🇺🇸 Baltimore	7,845	1943
40	Naval Air Systems Command (NAVAIR)navair.navy.mil Delivers timely, effective, and sustainable naval aviation capabilities to ensure warfighter dominance and mission success while prioritizing safety and national defense objectives.	Defense and Space Manufacturing	🇺🇸 Patuxent River	7,687	n/a
41	CareFirst BlueCross BlueShield carefirst.com Providing affordable, accessible, and quality healthcare services to over 3.5 million people with empathy, innovation, and community focus.	Insurance	🇺🇸 Baltimore	7,214	1934
42	OneMain Financial onemainfinancial.com A leading provider of responsible credit access for nonprime customers, focusing on improving financial well-being and offering personal loans and credit cards	Financial Services	🇺🇸 Baltimore	7,203	1912
43	Anne Arundel County Public Schools aacps.org A progressive school system in Anne Arundel County offering a challenging and rewarding educational experience with a focus on success for every student	Primary and Secondary Education	🇺🇸 Annapolis	7,166	n/a
44	The Johns Hopkins University School of Medicine hopkinsmedicine.org Provider of top-ranked medical and graduate programs, clinical fellowships, residencies, basic science research opportunities, and medical art programs with renowned experts	Hospitals and Health Care	🇺🇸 Baltimore	7,057	1889
45	Comfort Inn choicehotels.com This company offers modern, welcoming hotels with amenities to help guests feel refreshed and ready to take on the day, focusing on owner success and growth	Hospitality	🇺🇸 Rockville	6,996	n/a
46	Actalent actalentservices.com Actalent specializes in providing scalable talent solutions and services globally, focusing on engineering, sciences, and professional development to drive value for clients	Business Consulting and Services	🇺🇸 Hanover	6,572	n/a
47	University of Maryland Medical Center umm.edu A renowned teaching hospital in Baltimore providing comprehensive healthcare services, specializing in trauma, cancer care, organ transplants, and minimally invasive surgeries since 1823	Hospitals and Health Care	🇺🇸 Baltimore	6,540	n/a
48	Indian Health Service ihs.gov A US government agency providing comprehensive healthcare services to American Indian and Alaska Native communities through various career opportunities and programs	Hospitals and Health Care	🇺🇸 Rockville	6,468	1955
49	Centers for Medicare & Medicaid Services cms.gov Administration of Medicare, Medicaid, CHIP, and Health Insurance Marketplace providing health coverage to over 160 million Americans nationwide.	Government Administration	🇺🇸 Baltimore	6,340	1977
50	Senior Helpers seniorhelpers.com Provider of in-home senior assistance with specialized training in Alzheimer's, Dementia, and Parkinson's care Recognized as a great place to work	Home Health Care Services	🇺🇸 Towson	6,175	2002
51	Towson University towson.edu An established and rapidly growing public university offering a diverse range of degree programs, resources, and opportunities for student success and preparation for the future	Higher Education	🇺🇸 Towson	5,861	1866
52	The Whiting-Turner Contracting Company whiting-turner.com Provides construction management, general contracting, design-build, and integrated project delivery services for diverse projects nationwide with integrity and excellence.	Construction	🇺🇸 Towson	5,763	1909
53	Erickson Senior Living ericksonseniorlivingcareers.com Development and management of continuing care communities providing high-quality amenities, programs, and services for senior residents nationwide.	Hospitals and Health Care	🇺🇸 Catonsville	5,630	1983
54	Merkle merkle.com A leading CXM company specializing in delivering personalized customer experiences through data, technology, analytics, and marketing strategies for Fortune 1000 companies	Business Consulting and Services	🇺🇸 Columbia	5,624	n/a
55	ESAB Corporation esabcorporation.com A global leader in innovative solutions for fabrication and specialty gas control markets, focusing on continuous improvement and empowering associates worldwide	Machinery Manufacturing	🇺🇸 North Bethesda	5,556	n/a
56	Total Wine & More totalwine.com Retailer offering extensive selection of wines, beers, and spirits with commitment to low prices and excellent customer service.	Retail	🇺🇸 Bethesda	5,550	1991
57	University of Maryland Baltimore County umbc.edu Public research university focused on innovation, interdisciplinary education, undergraduate success, and groundbreaking research with a strong emphasis on science, engineering, and information technology	Higher Education	🇺🇸 Baltimore	5,495	n/a
58	Howard County Public School System megaplusredirection.tedata.net Suburban community in Howard County, Maryland with over 285,000 residents Features a blend of old and new, urban and rural areas	Primary and Secondary Education	🇺🇸 Ellicott City	5,413	n/a
59	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	Government Administration	🇺🇸 Bethesda	5,247	n/a
60	Sinclair Inc.sbgi.net A diversified media company providing local news, sports, and entertainment through TV stations, regional sports networks, and digital platforms	Broadcast Media Production and Distribution	🇺🇸 Cockeysville	5,191	1986
61	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	Research Services	🇺🇸 Gaithersburg	4,946	1901
62	Montgomery County Government montgomerycountymd.gov Providing responsive government services, affordable housing, transportation, education, health, safety, economic vitality, and inclusive community support for residents.	Government Administration	🇺🇸 Rockville	4,825	n/a
63	Frederick County Public Schools fcps.org The company is a school district in Frederick, Maryland known for its top-ranked education system, high student achievement, and low dropout rate	Primary and Secondary Education	🇺🇸 Frederick	4,686	n/a
64	National Security Agency nsa.gov Provides foreign signals intelligence to policymakers and military forces while securing national security systems and weaponry through advanced cybersecurity and computer operations.	Defense and Space Manufacturing	🇺🇸 Ft. Meade	4,637	1952
65	LifeBridge Health lifebridgehealth.org Regional healthcare organization providing hospital services, primary and specialty care, wellness programs, and community health education in northwest Baltimore.	Hospitals and Health Care	🇺🇸 Baltimore	4,617	1998
66	Luminis Health luminishealth.org A nationally recognized health system in Maryland providing high-quality care at nearly 100 sites of care, prioritizing health equity and community partnerships	Hospitals and Health Care	🇺🇸 Parole	4,547	n/a
67	W. R. Grace grace.com Supplies catalysts, engineered materials, process technologies, fine chemicals. Industries enhance modern life. Manufactures renewable fuels, pharmaceuticals, food packaging better, faster, smarter.	Chemical Manufacturing	🇺🇸 Columbia	4,244	n/a
68	Jhpiego jhpiego.org International non-profit health organization, affiliated with Johns Hopkins University, focuses on gynecology and obstetrics, providing education and training for better health outcomes.	Non-profit Organizations	🇺🇸 Baltimore	4,139	1973
69	GP Strategies Corporation gpstrategies.com Provides consulting, learning services, and technology solutions to help organizations improve workforce performance and achieve business transformation through people.	Business Consulting and Services	🇺🇸 Columbia	4,090	1966
70	NASA Goddard Space Flight Center nasa.gov A major US laboratory developing and operating unmanned scientific spacecraft for NASA's Earth observation, astronomy, planetary science, and astrophysics missions	Defense and Space Manufacturing	🇺🇸 Greenbelt	4,049	1959
71	ISS \| Institutional Shareholder Services iss-stoxx.com A global provider of data, analytics, and insights for investors and companies, specializing in corporate governance, responsible investment solutions, and market intelligence	Financial Services	🇺🇸 Rockville	4,014	n/a
72	University of Maryland, Baltimore (UMB)umaryland.edu A leading public research university in Maryland offering professional schools in health, law, and human services since 1807	Higher Education	🇺🇸 Baltimore	3,994	1807
73	Piedmont Airlines piedmont-airlines.com An airline with a long history of providing scheduled service to over 70 cities in the eastern US and Canada Operating the ERJ-145 aircraft	Airlines and Aviation	🇺🇸 Salisbury	3,883	1931
74	ESAB esab.com A global leader in welding technology, offering equipment, consumables, automation, and cutting systems to improve productivity and reduce costs for manufacturers worldwide	Machinery Manufacturing	🇺🇸 North Bethesda	3,785	1904
75	Kiddie Academy kiddieacademy.com The company provides education-based child care for children ages 6 weeks to 12 years old, with a focus on quality education and franchise opportunities	Education Administration Programs	🇺🇸 Abingdon	3,776	1981
76	Abt Global abtglobal.com Global leader in research, evaluation, and program implementation addressing health, education, environment, agriculture, housing, and data collection challenges worldwide.	Professional Services	🇺🇸 Rockville	3,748	n/a
77	Johns Hopkins Bloomberg School of Public Health publichealth.jhu.edu A leading institution in public health education and research, dedicated to improving global health through knowledge discovery and application	Higher Education	🇺🇸 Baltimore	3,721	n/a
78	Montgomery College montgomerycollege.edu A public, open admission institution dedicated to student success and offering a wide range of academic programs with a focus on equity, excellence, and community impact	Higher Education	🇺🇸 Montgomery County	3,718	1946
79	Maxim Healthcare Services maximhealthcare.com Providing comprehensive healthcare services including skilled nursing, rehabilitation, companion care, and behavioral care for individuals with chronic illnesses and disabilities	Hospitals and Health Care	🇺🇸 Columbia	3,694	1988
80	Exelon Generation constellationenergy.com A leading producer of carbon-free energy, offering power and energy products for homes and businesses nationwide, accelerating the transition to clean energy	Oil and Gas	🇺🇸 Baltimore	3,675	n/a
81	DAI dai.com A global development company with over 50 years of experience tackling social and economic challenges through innovative solutions in nearly 100 countries	International Trade and Development	🇺🇸 Bethesda	3,623	1970
82	Allegis Group allegisgroup.com Providing comprehensive talent solutions worldwide through specialized companies, connecting people with opportunities and solving workforce challenges for business success.	Staffing and Recruiting	🇺🇸 Hanover	3,570	1983
83	Precision Medicine Group precisionmedicinegrp.com A company founded in 2012 focused on improving the drug development process through technology, data, human expertise, and strategic acquisitions	Pharmaceutical Manufacturing	🇺🇸 Bethesda	3,553	2012
84	Department Of Navy Facilities services provider located in Patuxent River, MD, specializing in serving the Department of Navy	Facilities Services	🇺🇸 Patuxent River	3,516	n/a
85	Morgan State University linktr.ee A public urban research university offering over 125 academic programs, preparing diverse graduates to lead through innovative education and community service	Higher Education	🇺🇸 Baltimore	3,501	1867
86	LAPO Microfinance lapo-nigeria.org A microfinance bank in Nigeria offering financial products to support small businesses and low-income households nationwide through a large branch network	Banking	🇺🇸 Maryland	3,501	1987
87	Adventist HealthCare adventisthealthcare.com Faith-based healthcare organization in Maryland, dedicated to improving physical, mental, and spiritual health through hospitals, rehabilitation centers, home care, and physician networks	Hospitals and Health Care	🇺🇸 Gaithersburg	3,422	1907
88	Westat westat.com 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
89	City of Baltimore baltimorecity.gov The company is based in Baltimore, Maryland, and focuses on historical preservation, with a focus on National Register historic districts and public monuments	Government Administration	🇺🇸 Baltimore	3,376	n/a
90	Sheppard Pratt sheppardpratt.org A leading nonprofit provider of mental health, substance use, special education, and social services through hospital- and community-based resources, prioritizing global mental health care quality	Mental Health Care	🇺🇸 Baltimore	3,354	n/a
91	Inovalon inovalon.com Inovalon offers data-driven SaaS solutions on a cloud platform to improve clinical outcomes and economics in healthcare for various organizations	Software Development	🇺🇸 Bowie	3,316	n/a
92	USDA Animal and Plant Health Inspection Service (APHIS)aphis.usda.gov This organization protects agriculture and natural resources, regulates genetically modified organisms, enforces the Animal Welfare Act, and manages wildlife damage	Government Administration	🇺🇸 Riverdale	3,235	1972
93	Hughes hughes.com Provides broadband equipment, services, and network operations to millions of consumers, businesses, and governments worldwide via satellite and multi-transport technologies.	Telecommunications	🇺🇸 Germantown	3,209	1971
94	HealthPRO Heritage healthpro-heritage.com A privately owned consulting and therapy management firm offering innovative, evidence-based therapy and wellness services for seniors across various care settings	Hospitals and Health Care	🇺🇸 Hunt Valley	3,109	1997
95	Aloft Hotels aloft-hotels.marriott.com Aloft hotels offer unique, contemporary spaces with vibrant social scenes and innovative programming for the next generation of global travelers	Hospitality	🇺🇸 Bethesda	3,090	2007
96	Harford County Public Schools hcps.org A K-12 public education school system serving 40,000 students with 53 schools and 7,000 employees, including elementary, middle, high, and special needs schools	Education Administration Programs	🇺🇸 Bel Air	3,075	n/a
97	Baltimore County baltimorecountymd.gov Supports businesses and individuals in Baltimore County with resources and opportunities to thrive, emphasizing a diverse community and vibrant environment for success	Government Administration	🇺🇸 Towson	3,043	n/a
98	GURU guruconsult.com An established IT managed service provider offering infrastructure support, data architecture, cloud services, and hybrid solutions with a strong focus on quality, integrity, and customer service	IT Services and IT Consulting	🇺🇸 Rockville	3,038	1995
99	Renaissance Hotels marriott.com Luxury hotel chain focused on unique design, neighborhood experiences, and local immersion, encouraging guests to discover hidden gems at each location	Hospitality	🇺🇸 Bethesda	3,031	n/a
100	Allegis Global Solutions allegisglobalsolutions.com Global workforce solutions provider specializing in workforce design, management, consulting, and procurement to transform organizations and enhance competitive advantage.	Staffing and Recruiting	🇺🇸 Hanover	3,021	2001

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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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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 Wisconsin 1,482
The largest companies in Arizona 1,449
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