| # | Company | Employees |
|---|---|---|
| 1 |
Amentumamentum.com
Amentum is a global leader in engineering, project management, and solutions integration, specializing in modernizing critical missions worldwide with speed and confidence |
50,000 |
| 2 |
Parsons Corporationparsons.com
A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach |
20,710 |
| 3 |
General Dynamics Mission Systemsgdmissionsystems.com
A mission-critical C4ISR solutions provider developing technology for communication, data sharing, mine detection, and more across various domains |
9,815 |
| 4 |
OnTracontrac.com
Provides last-mile e-commerce delivery services across 35 states and D.C., enabling faster, cost-effective, and reliable shipments for retailers. |
6,171 |
| 5 |
Aptaraaptaracorp.com
Transforms content for digital and corporate learning audiences, accelerating information providers' transition from print to digital with production, design, and new media enhancements. |
5,633 |
| 6 |
The Aerospace Corporationaerospace.org
Providing objective technical expertise and leadership to solve complex space challenges, ensuring mission success for national security and commercial space programs. |
5,274 |
| 7 |
QBurstqburst.com
A full-service software solutions provider that helps clients enhance business effectiveness by leveraging digital technology |
3,383 |
| 8 |
Samson Propertiessamsonproperties.net
A real estate brokerage firm founded by REALTORS庐 in 1986, offering an innovative 100% commission model and support for agents |
3,106 |
| 9 |
Perspectaperaton.com
Innovative provider of diverse capabilities in defense, intelligence, healthcare, and more, supporting US government missions with patented solutions and digital transformation services |
2,820 |
| 10 |
ECS Group of Companiesecslimited.com
A consulting engineering firm offering geotechnical, environmental, construction materials testing, and facilities engineering services through its employee-owned subsidiaries across the US |
2,665 |
| 11 |
Blue Cross Blue Shieldbcbs.com
Health insurance provider offering a range of products for large employer groups, small businesses, and individuals, based in Chantilly, Virginia |
2,217 |
| 12 |
Pavionpavion.com
A company providing fire, security, and integration solutions across multiple industries with a focus on safety, security, and communication |
2,143 |
| 13 | 2,106 | |
| 14 |
Koniag Government Serviceskoniag-gs.com
A Native community-focused company delivering Enterprise Solutions, Professional Services, and Operational Management to Federal Government Agencies with a commitment to exceptional service delivery |
1,530 |
| 15 |
Red Riverredriver.com
Provides technology integration services with expertise in security, networking, analytics, collaboration, mobility, and cloud solutions for businesses and government. |
1,527 |
| 16 |
Long and Foster, REALTORSLongandFoster.com
A leading residential real estate company in the US with divisions in mortgage, insurance, and settlement services, as well as global affiliations |
1,498 |
| 17 |
Arcfieldarcfield.com
Provider of systems engineering and integration services to US Intelligence Community and Department of Defense, with expertise in advanced engineering, IT, and analysis |
949 |
| 18 |
National Reconnaissance Office (NRO)nro.gov
Develops and operates advanced space-based intelligence systems providing satellite imagery, tracking capabilities, and global data to support national security, military, and humanitarian missions. |
569 |
| 19 |
Vencore Inc.peraton.com
A diverse company providing innovative solutions to US government customers in defense, intelligence, civilian, healthcare, and state/local markets through mission services and digital transformation |
563 |
| 20 |
Vision Group Retailvisiongroupretail.com
Global tech group digitizing brick-and-mortar retail through AI image recognition and IoT technology Providing solutions for retail execution, consumer behavior tracking, and autonomous retail |
538 |
| 21 |
Ampcus Incampcus.com
A global technology and business consulting firm specializing in Digital Transformation, Big Data, Analytics, Cyber Security, Testing, and Enterprise Solutions |
535 |
| 22 |
Granules Pharmaceuticals, Inc.
A pharmaceuticals based in Chantilly, Virginia, specializing in the development and manufacturing of pharmaceutical products |
508 |
| 23 |
System High Corporationsystemhigh.com
Delivers advanced protection and secrecy solutions to secure critical missions, programs, operations, and intelligence activities across various domains. |
419 |
| 24 |
TeleWorld Solutionsteleworldsolutions.com
TeleWorld Solutions specializes in building next-generation 5G wireless networks across the US, providing efficient and cost-effective network solutions for clients |
417 |
| 25 |
Chenega Security SBUchenegasecurity.com
An Alaska Native Corporation division offering top-notch security services and products to government clients, prioritizing military experience and career growth |
415 |
| 26 |
Adaequareadaequare.com
A CMMi Level 3 Certified company with a global presence, focusing on providing precise, cost-effective solutions and transforming enterprise performance for various industries |
415 |
| 27 |
TechTammina LLC
Offers digital transformation services automating business processes, custom software and application development, and offshore software development with quality assurance. |
399 |
| 28 |
Rite-Solutions, Inc.rite-solutions.com
An award-winning SDVOSB that designs and deploys mission-critical software and systems for government and commercial markets, providing an Information Advantage through innovative solutions |
358 |
| 29 |
Long & Foster Real Estate, Inc.LongandFoster.com
A leading residential real estate company in the US, offering mortgage, insurance, and settlement services Exclusive affiliate for Christie's International Real Estate |
349 |
| 30 |
iENGINEERINGiengineering.com
A global information-engineering firm specializing in transportation engineering software and e-business applications with a focus on quality and client satisfaction |
334 |
| 31 |
Unofficial M.C. Deanbit.ly
This company is no longer active Employees should connect with or follow MC Dean, Inc for updates and information |
332 |
| 32 |
Jenkins Restorationsjenkinsrestorations.com
A trusted insurance repair specialist offering 24/7 emergency services for residential and commercial damage restoration, rebuilding properties with honesty and integrity |
309 |
| 33 |
Bravens Inc.bravensinc.com
An Information Technology Consulting and Services firm providing staffing, employment solutions, outsourcing, and integrated IT solutions for various companies and organizations |
223 |
| 34 |
Compu Dynamicscompu-dynamics.com
Leading data center and facility management experts in Maryland, Virginia, and Washington, DC, specializing in energy efficient solutions and project delivery |
217 |
| 35 |
AnaVation LLCanavationllc.com
Trusted partner delivering innovative, cost-effective solutions for complex technical and analytical challenges, focusing on cyber data analysis and future readiness |
190 |
| 36 |
Meadows Farms Nurseries & Landscapingmeadowsfarms.com
A leading nursery and garden center with 17 retail locations, offering landscaping services through 39 designers and 70 daily crews |
181 |
| 37 |
Pavionpavion.com
Provider of fire, security, and communication integration solutions for customers in various industries across the US and globally Promotes safety and transformation through technology |
178 |
| 38 |
ESP, LLCsev1tech.com
Sev1Tech offers a range of capabilities and services through their entity, ESP Follow them on LinkedIn for more information |
175 |
| 39 |
TCB | 24/7 EXPERT IT Supporttcbinc.com
Innovative IT solutions provider specializing in managed services, network security, software development, consulting, and computer products for businesses since 1993 |
174 |
| 40 |
SuccessKPIsuccesskpi.com
A revolutionary platform uses AI to unify data from customer interactions across channels, optimizing customer service delivery for various industries globally |
171 |
| 41 |
Sciolex Corporationsciolex.com
Provider of program management, system engineering, architecture development, system integration, and intelligence analysis support to the Intelligence Community Join our team of experts |
168 |
| 42 |
Quinn Consulting Services, Inc.quinn-consulting.com
A woman-owned firm specializing in Construction Inspection, Management, QA/QC, Engineering Support, and Coating Inspection services with a highly trained team |
168 |
| 43 |
FTS International, LLCfts-intl.com
Specializing in providing unbiased support to the US Government and Intelligence Community by attracting top talent and solving national security problems Visit website for more |
166 |
| 44 |
MEBS Globalmebs-global.com
MEBS Global provides in-country support, cargo transportation, logistics management, relocation, and mobility services in emerging markets and conflict environments worldwide |
165 |
| 45 |
ProKatchers LLCprokatchers.com
ProKatchers provides customized staffing solutions including recruitment, direct placement, payroll services, and workforce programs to improve productivity and reduce costs for organizations |
163 |
| 46 |
MBA Consulting Services, Inc. (MBA CSi)mbacsi.com
A company providing innovative solutions to optimize technical systems, data, and mobility for government agencies, with nearly 400 employees in 46 locations worldwide |
160 |
| 47 |
Shelter House, Incshelterhouse.org
A non-profit organization in Virginia serving families experiencing homelessness and victims of domestic violence since 1981 |
160 |
| 48 |
Justice Federal Credit Unionjfcu.org
A credit union founded in 1935 serving the justice and law enforcement community with financial products, services, and nationwide accessibility |
157 |
| 49 |
TechLawtechlawinc.com
Established in 1983, this company provides environmental and management consulting services to the public sector nationwide Their team offers expertise in various fields |
153 |
| 50 |
National Captioning Institutencicap.org
Pioneering provider of captioning services for TV, web, DVD, and more Also offers subtitling, language translation, and described video services |
150 |
| 51 | 150 | |
| 52 |
Alliance Tek Solutionsallianceteksolutions.com
A company specializing in providing top talent and innovative solutions for businesses in the STEM field, prioritizing employee growth and well-being |
146 |
| 53 |
Soft Tech Consultingsofttechconsulting.com
A woman and minority-owned IT consulting firm in the DC metro area providing effective, affordable, and cutting-edge IT solutions for public and private sectors |
146 |
| 54 |
SP Global, Inc.SPGlobalInc.com
SP Global commercializes innovative Societal Enhancement Technologies, building $100M+ companies in locations that benefit communities, creating stronger, more resilient societies |
35 |
| 55 |
INSI Cloud Inc.insicloud.com
A leading IT solutions provider specializing in Business Operations, Cyber Security, AI, and ML solutions for government clients with top certifications |
28 |
| 56 |
GROF INTERNATIONALgrofusa.com
Supplier of high-quality products to developers, architects, contractors, and homeowners, offering competitive prices, personalized service, and innovative design solutions |
26 |
| 57 |
Ven Soft LLCvensoftllc.com
A leading IT consulting firm offering professional services like application development, system integration, and BI solutions to Fortune 500 companies globally |
24 |
| 58 |
WilmerTechwilmertech.com
A women-owned minority IT services and consulting firm delivering cloud services, custom application development, mobile apps, staff augmentation, and contact center services globally |
17 |
| 59 |
Sky Solutions LLCskysolutions.us
A leading provider of IT services specializing in Business Process Management (BPM) and Business Intelligence solutions, delivering quality results |
16 |
| 60 |
McIntire Solutions, LLCmcintiresolutions.com
Company provides business, engineering, and technology expertise to government agencies, specializing in IT solutions for transformation, integration, and modernization Visit website for career opportunities |
13 |
| 61 |
Wilmer Technologieswilmertech.com
An IT services and consulting company providing cloud services, custom application development, product maintenance, mobile applications, staff augmentation, and contact/call center services globally |
8 |
| 62 |
SaivennAppssaivenapps.com
A global leader in digital transformation, offering services in enterprise mobility, application development, testing, consulting, and innovative solutions for various industries worldwide |
4 |
| 63 |
2BTech Solutions, LLC2btechsolutions.com
Offering top-tier technology services and solutions to drive impactful change and help clients achieve their goals through collaboration and expertise |
3 |
| 64 |
PlusAdplusad.net
A marketing solutions company specializing in transforming services to electronic & smart forms, offering cost-effective online advertising plans for businesses to thrive |
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 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