| # | Company | Employees |
|---|---|---|
| 1 |
US Armyusarmybasic.com
Providing prompt, sustained land dominance across full military operations spectrum, supporting combatant commanders in national defense and warfare. |
367,627 |
| 2 | 139,657 | |
| 3 |
Boeingboeing.com
A global aerospace leader providing commercial airplanes, defense, space systems, and services, focused on innovation, customer delivery, and employee growth |
129,130 |
| 4 |
Northrop Grummannorthropgrumman.com
Development of advanced technology solutions in autonomous systems, cyber, space, and defense to enhance global security and modernization. |
86,220 |
| 5 |
Army National Guardnationalguard.com
This organization is a component of the Army, providing National Guard Soldiers who serve in various missions both domestically and overseas |
59,575 |
| 6 |
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 |
| 7 | 48,589 | |
| 8 |
Booz Allen Hamiltonboozallen.com
Innovative technology consulting firm advancing critical missions through AI, cybersecurity, and engineering solutions, empowering clients to shape the future |
37,244 |
| 9 |
Leidosleidos.com
Global technology leader providing digital mission innovations and efficient technical services for government and commercial customers through a diverse, flexible work environment. |
37,171 |
| 10 | 36,645 | |
| 11 |
General Dynamics Information Technologygdit.com
Provides technology and professional services to U.S. government agencies, specializing in digital modernization, AI, cloud, cyber, and application development worldwide. |
26,598 |
| 12 |
CACI International Inccaci.com
providing advanced technology and expert services to address complex national security challenges for government and defense sectors |
22,223 |
| 13 |
Parsons Corporationparsons.com
A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach |
20,710 |
| 14 |
Peratonperaton.com
A company at the forefront of solving global challenges with innovative solutions, prioritizing safety and security through fresh perspectives and talent |
18,000 |
| 15 |
BAE Systems, Inc.jobs.baesystems.com
International defense, security, and aerospace operations providing advanced electronic systems, cyber intelligence, combat vehicles, naval weapons, ship maintenance, and vehicle upgrades for military use. |
16,731 |
| 16 | 11,084 | |
| 17 |
Defense Logistics Agencydla.mil
Management of global defense supply chain including procurement, warehousing, transportation, and disposal of military materials and services. |
10,533 |
| 18 |
MANTECHmantech.com
A dedicated company providing technology services to support national security, military welfare, community protection, and healthcare advancement for over 50 years |
10,459 |
| 19 |
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 |
| 20 |
Accenture Federal Servicesaccenture.com
The company brings advanced R&D, latest technologies, and human-centered design to the federal government to create lasting value and drive positive change |
9,719 |
| 21 | 9,164 | |
| 22 |
Newport News Shipbuilding, A Division of HIIhii.com
A division specializing in designing, building, and refueling nuclear-powered aircraft carriers and submarines, with a legacy of ship construction for the US Navy |
8,751 |
| 23 | 7,949 | |
| 24 |
Leonardo DRSleonardodrs.com
Providing advanced sensing, network computing, force protection, and electric power propulsion technologies to global national security customers through practical, high-performance defense innovation. |
6,551 |
| 25 |
United States Department of the Armyarmy.mil
The Department of the Army is a federal government agency within the Department of Defense responsible for organizing and leading the United States Army |
6,218 |
| 26 |
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 |
| 27 |
ASRC Federalasrcfederal.com
Providing technology and expertise to federal defense and civilian agencies, supporting missions from space exploration to cybersecurity and infrastructure. |
5,051 |
| 28 |
Mission Technologies, a division of HIIhii.com
The company's Mission Technologies division develops integrated solutions for military operations, including C5ISR, AI, cyberspace strategies, unmanned systems, and platform modernization |
5,049 |
| 29 |
PAEamentum.com
Global operational support provider with over 20,000 employees in 60 countries, delivering secure services for US government and allies since 1955 |
4,780 |
| 30 | 4,234 | |
| 31 |
Norfolk Naval Shipyardnavsea.navy.mil
A world-class shipyard committed to delivering excellence to the fleet safely, on time, and within budget at a state-of-the-art facility |
4,039 |
| 32 |
ECSecstech.com
ECS provides advanced technology, science, and digital solutions to address cyber threats for customers in the public and private sectors |
3,996 |
| 33 |
Military Sealift Commandmsc.usff.navy.mil
This company operates civilian-crewed ships that support the US Navy, conduct specialized missions, preposition combat cargo at sea, and transport military supplies worldwide |
3,864 |
| 34 |
Maersk Line, Limitedmaersklinelimited.com
American company provides US flag transportation, ship management, and maritime services to government and commercial customers with global expertise and environmental stewardship |
3,600 |
| 35 |
Orbital ATKnorthropgrumman.com
Design and production of reliable, innovative space-related systems, defense products, and commercially-driven services for access to space for various global aerospace markets. |
3,531 |
| 36 |
National Geospatial-Intelligence Agencynga.mil
Delivers world-class geospatial intelligence to warfighters, policymakers, and first responders to support national security priorities, disaster response, and global navigation efforts. |
3,199 |
| 37 |
GovCIOgovcio.com
Deliver IT solutions and services using Agile methods and innovation to optimize government operations and support citizen-focused missions. |
3,164 |
| 38 | 3,124 | |
| 39 |
LMIlmisolutions.com
A consultancy leveraging federal expertise and innovation to drive mission success, inspire creativity, and accelerate progress for evolving mission needs |
3,040 |
| 40 |
Triple Canopy (A Constellis Company)constellis.com
A leading provider of risk management and operational support services to government and commercial clients worldwide, with a focus on compliance and ethical practices |
2,891 |
| 41 |
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 |
| 42 | 2,744 | |
| 43 | 2,526 | |
| 44 |
SRA, a CSRA company
A provider of information technology services that acquired CSRA Inc in 2018 and completed a combination with SRA International in 2015 |
2,492 |
| 45 | 2,466 | |
| 46 |
Modern Technology Solutions, Inc. (MTSI)mtsi-va.com
Employee-owned engineering company providing technology solutions in areas such as missile defense, cyber security, intelligence, aviation, and homeland security |
2,308 |
| 47 |
Systems Planning & Analysisspa.com
Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. |
2,242 |
| 48 |
AMERICAN SYSTEMSamericansystems.com
Employee-owned federal government contractor providing strategic solutions in IT, test & evaluation, mission support, engineering, and training for national priority programs |
2,212 |
| 49 |
National Guard Bureaunationalguard.mil
The National Guard Bureau oversees the Army National Guard and Air Guard, providing national-level guidance and support to all states and territories |
2,131 |
| 50 |
CNA Corporationcna.org
A nonprofit research organization focused on national security, providing actionable solutions to complex problems through data analysis and field programs |
2,094 |
| 51 |
DCS Corpdcscorp.com
Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. |
2,043 |
| 52 |
Valiant Integrated Servicesonevaliant.com
Valiant supports critical missions worldwide by providing training, equipment, protection, and support for government agencies, peacekeepers, relief workers, and disaster response teams |
2,006 |
| 53 |
MAG Aerospacemagaero.com
Provider of real-time situational awareness solutions enabling global safety, delivering C5ISR services, joint domain command, and premier engineering & operational solutions worldwide Website: wwwmagaerocom |
1,928 |
| 54 |
UICGS / Bowhead Family of Companiesbowhead.com
A division of an Alaskan Native Corporation, offering premier support to defense and civilian government agencies through various services across the United States |
1,927 |
| 55 |
General Dynamics Advanced Information Systemsgd-ais.com
An advanced information systems provider offering mission solutions for defense, intelligence, space, and homeland security, integrating land, air, sea, space, and cyber assets |
1,840 |
| 56 |
NASA Langley Research Centernasa.gov
Pioneering aeronautics research center located in Hampton, Virginia, on the Chesapeake Bay, contributing to NASA's aerospace and science advancements |
1,714 |
| 57 |
Marine Corps Systems Commandmarcorsyscom.marines.mil
Marine Corps Systems Command equips and sustains Marine forces with ground weapon and IT systems for expeditionary and crisis-response capabilities |
1,659 |
| 58 |
Agile Defenseagiledefense.com
Innovating IT solutions for US government agencies, transforming operations through a philosophy of listening, thinking, and innovation |
1,572 |
| 59 | 1,569 | |
| 60 |
Alion Science and Technologyhii.com
A company previously known as Alion is now part of Huntington Ingalls Industries (HII), offering innovative solutions in various industries |
1,564 |
| 61 |
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 |
| 62 |
Institute for Defense Analysesida.org
Provides objective, scientifically rigorous research and advice on national security issues through federally funded research centers with expert staff. |
1,524 |
| 63 |
QinetiQ USqinetiq.com
Innovative technology development for defense, security, and commercial markets with focus on Mission Operations, ISR, Cyber, Information Advantage, and Robotics |
1,474 |
| 64 |
Engility Corporationsaic.com
A premier technology integrator based in Reston, Virginia, providing information about SAIC through their linkedin page |
1,414 |
| 65 |
Intelsatintelsat.com
Global leader in satellite technology, connecting people, businesses, and communities with advanced satellite fleet and network infrastructure to enable transformation and connectivity |
1,387 |
| 66 |
VT Group (VTG)vtgdefense.com
VTG is a company based in Chantilly, Virginia that specializes in delivering force modernization and digital transformation solutions for various defense sectors |
1,368 |
| 67 |
Credencecredence.ai
A leading government contractor providing technology, health, development, engineering, and management solutions with a focus on exceeding customer expectations and employee wellbeing |
1,345 |
| 68 |
Noblisnoblis.org
A nonprofit organization providing scientific, technology, and strategy services to government and industry clients in national security, healthcare, and environmental sustainability |
1,313 |
| 69 |
HII Technical Solutions, a division of Huntington Ingalls Industriestsd.huntingtoningalls.com
The company specializes in mission technologies, offering a range of services and solutions Visit their new LinkedIn page for more information |
1,295 |
| 70 |
SETsetcorp.com
A small business founded by DARPA scientists in 2002, specializing in creating and commercializing innovative "smart" information technologies for defense and intelligence clients |
1,240 |
| 71 |
Naval Surface Warfare Center Dahlgren Divisionnavsea.navy.mil
A leading naval warfare institution specializing in warfare systems development and integration for the military, located in Dahlgren, VA |
1,218 |
| 72 |
U.S. Army and Army National Guardarmy.mil
Company specializing in providing LinkedIn position descriptions tailored for members and veterans of the US Army and Army National Guard |
1,168 |
| 73 |
ADS, Inc.adsinc.com
Provider of innovative solutions for equipment, procurement, and logistics challenges Extensive supplier network for custom solutions in defense industry |
1,165 |
| 74 |
Orbital Sciences Corporation is now Orbital ATK!northropgrumman.com
Global leader in aerospace and defense technologies, designing, building, and delivering space, defense, and aviation systems worldwide Employing over 12,500 people in US and internationally |
1,104 |
| 75 |
BOSH Global Servicesmagaero.com
Specializing in supporting unmanned systems, first responder communications, video technology, and ISR systems with operations, training, data analysis, and network support |
1,070 |
| 76 | 1,052 | |
| 77 |
Defense Advanced Research Projects Agency (DARPA)darpa.mil
Develops transformational defense and national security capabilities through academic, industrial, and government partnerships to create technological breakthroughs like precision weaponry and internet-scale civilian innovations. |
1,033 |
| 78 |
US Army TRADOCarmy.mil
Recruits, trains, educates Soldiers, develops leaders, establishes standards, and evolves organizational designs and concepts to build a prepared and successful US Army |
1,018 |
| 79 | 1,003 | |
| 80 |
ISCIteamisci.com
A trusted provider of information solutions, professional services, and cybersecurity for government organizations, delivering excellence through expertise and dedication |
988 |
| 81 |
ST Engineering iDirectidirect.net
provides advanced satellite communication technology and solutions enabling customers to enhance services, optimize networks, and expand business globally |
972 |
| 82 |
Tyto Athene, LLCgotyto.com
Specializing in mission-focused digital transformation, our experts offer expertise in Network Modernization, Hybrid Cloud, Cyber Security, and Enterprise IT for defense and security sectors |
967 |
| 83 |
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 |
| 84 |
Synergysynergybis.com
Federal IT firm specializing in cloud, low/no code SaaS platforms, delivering agile MVP solutions to accelerate agency modernization goals. |
865 |
| 85 |
Air Force Office of Special Investigations (AFOSI)osi.af.mil
A federal law enforcement and counterintelligence agency conducting major investigations, cyber crime investigations, specialized services, secret protection, threat detection, and engaging foreign threats |
832 |
| 86 |
Riverside Researchriversideresearch.org
A nonprofit organization conducting independent research in various scientific fields to advance innovation and provide high-value solutions to government customers |
801 |
| 87 |
Aurora Flight Sciencesaurora.aero
They advance the future of flight by developing innovations in aircraft configurations, autonomous systems, propulsion technologies, and manufacturing processes |
800 |
| 88 |
Centerra Groupcenterragroup.com
Global risk management and operational support services provider to government and commercial clients worldwide, with a focus on ethical practices and tailored solutions |
795 |
| 89 |
SAP NS2sapns2.com
The company offers cost-effective solutions with quick deployment times, robust support, and cleared personnel for mission-critical applications, leveraging industry-leading software tools and expertise |
791 |
| 90 |
CALIBRE Systems, Inc.calibresys.com
A management consulting and digital transformation company serving government and industry clients with enduring solutions for management, technology, and program challenges |
784 |
| 91 |
Sev1Tech LLCsev1tech.com
A provider of innovative technology, high-end engineering, and mission solutions Offering expertise in various functional areas to help customers succeed beyond expectations |
778 |
| 92 |
Everfoxeverfox.com
A leading provider of defense-grade cyber security solutions, specializing in cross domain, threat protection, and insider risk solutions for governments and enterprises |
760 |
| 93 |
Zeiders Enterprises, Inc.zeiders.com
A veteran-owned government contractor providing program solutions and services to improve the quality of life for Military and Veteran communities |
755 |
| 94 |
ENSCO, Inc.ensco.com
Provides leading-edge engineering, science, and advanced technology solutions to governments and private industries in aerospace, national security, and surface transportation sectors. |
745 |
| 95 |
By Light Professional IT Servicesbylight.com
Hardware and software engineering services provider for defense, civilian, and commercial sectors worldwide, offering reliable and cost-effective IT solutions |
731 |
| 96 |
L-3 National Security Solutionscaci.com
A company that was acquired by CACI International Inc on February 1, 2016, specializing in national security solutions Visit https://wwwlinkedincom/company/caci-international-inc |
729 |
| 97 |
Sallyport Globalacuityinternational.com
Global provider of security and mission support solutions tailored for security and stability operations worldwide, focused on exceeding customer requirements with core values of integrity and quality |
704 |
| 98 |
Tata Group - North Americatata.com
Global business group with diverse operations including IT services, consulting, steel production, luxury hotels, automotive engineering, mining, consumer brands, and philanthropic activities |
699 |
| 99 |
AMSEC LLC, A Subsidiary of Huntington Ingalls Industrieshii.com
A global company with over 35 locations providing maintenance, modernization, unmanned systems development, engineering, logistics, software development, and training solutions |
698 |
| 100 |
Two Six Technologiestwosixtech.com
Innovative company specializing in cyber, information operations, data science, electronic systems, and more to solve complex global challenges for various government agencies |
670 |
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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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