| # | Company | Employees |
|---|---|---|
| 1 |
Northrop Grummannorthropgrumman.com
Development of advanced technology solutions in autonomous systems, cyber, space, and defense to enhance global security and modernization. |
86,220 |
| 2 |
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 |
| 3 | 48,589 | |
| 4 |
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 |
| 5 | 36,645 | |
| 6 |
CACI International Inccaci.com
providing advanced technology and expert services to address complex national security challenges for government and defense sectors |
22,223 |
| 7 |
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 |
| 8 | 11,084 | |
| 9 |
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 |
| 10 |
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 |
| 11 | 7,949 | |
| 12 |
Defense Contract Management Agency (DCMA)dcma.mil
Integrated team of acquisition and support professionals managing contracts for the Defense Department, other federal organizations, and international partners to equip warfighters |
6,724 |
| 13 |
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 |
| 14 |
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 |
| 15 | 4,234 | |
| 16 |
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 |
| 17 |
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 |
| 18 |
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 |
| 19 | 3,124 | |
| 20 | 2,744 | |
| 21 | 2,526 | |
| 22 | 2,466 | |
| 23 |
Systems Planning & Analysisspa.com
Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. |
2,242 |
| 24 |
DCS Corpdcscorp.com
Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. |
2,043 |
| 25 |
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 |
| 26 |
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 |
| 27 |
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 |
| 28 |
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 |
| 29 |
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 |
| 30 |
Defense Threat Reduction Agencydtra.mil
Support DoD and international partners in countering and deterring weapons of mass destruction and emerging global threats. |
1,506 |
| 31 |
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 |
| 32 |
Engility Corporationsaic.com
A premier technology integrator based in Reston, Virginia, providing information about SAIC through their linkedin page |
1,414 |
| 33 |
Caliburn Internationalacuityinternational.com
Acuity International is a global organization providing services in a wide range of areas Check out our website for more information |
1,377 |
| 34 |
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 |
| 35 |
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 |
| 36 |
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 |
| 37 |
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 |
| 38 |
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 |
| 39 |
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 |
| 40 | 1,003 | |
| 41 |
Defense Acquisition Universitywaru.edu
Trains and develops acquisition professionals to manage calculated risks while accelerating delivery of critical capabilities for defense and national security missions. |
837 |
| 42 |
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 |
| 43 |
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 |
| 44 | 639 | |
| 45 |
ARES Corporationarescorporation.com
A leading engineering and project management company specializing in reliability, IT security, and software solutions for nuclear, clean technology, space, and defense industries |
596 |
| 46 |
BlueHalo, an AV companybluehalo.com
BlueHalo is a leading provider of cutting-edge defense solutions in Space, C-UAS, Autonomous Systems, Electronic Warfare & Cyber, and AI/ML |
575 |
| 47 |
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 |
| 48 |
IDS Internationalidsinternational.com
A global leader offering comprehensive Training & Technical Services for government projects, including security, infrastructure protection, expeditionary support, specialized training, and cyber warfare solutions |
566 |
| 49 |
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 |
| 50 |
Valkyrie Enterprisesvalkyrie.com
A company founded in 2007, Valkyrie offers mission solutions, sustainment, and modernization to US Navy, DoD, and commercial clients worldwide Hiring skilled professionals |
536 |
| 51 |
Safran Defense & Space, Inc.safran-dsi.com
Design and manufacture advanced technologies and solutions for defense and space applications, supporting military and aerospace sectors. |
471 |
| 52 |
Argon STargonst.com
Leading developer of C5ISR systems to support operational commanders with timely information for critical decision-making in various scenarios |
466 |
| 53 |
Noblis MSDnoblis.org
A nonprofit subsidiary serving federal clients with scientific and technical excellence, impacting civil, defense, homeland security, and intelligence missions |
429 |
| 54 |
System High Corporationsystemhigh.com
Delivers advanced protection and secrecy solutions to secure critical missions, programs, operations, and intelligence activities across various domains. |
419 |
| 55 |
Progeny Systems-A General Dynamics Mission Systems Businessgdmissionsystems.com
Specializing in software/hardware solutions for defense, Progeny Systems supports military branches with submarine modernization, acoustics, cybersecurity, weapon control, and surveillance technologies |
397 |
| 56 |
Systems Planning and Analysis, Inc. (MCR LLC acquired by SPA in 2021)spa.com
Providing objective analysis and solutions for national security objectives, evolving to meet client needs in defense, homeland security, and energy sectors |
396 |
| 57 |
LGS Innovationscaci.com
A technology company providing mission-critical communications products, R&D, and services to defense, intelligence, government, and commercial clients worldwide |
381 |
| 58 |
Technomics, Inc.technomics.net
A growing consulting firm specializes in weapon system cost analysis, providing unbiased analysis and advice to assist clients in making critical decisions efficiently |
377 |
| 59 |
Defense Newsdefensenews.com
Independent global news source providing up-to-the-minute information and analysis on defense programs, policy, business, and technology for military, government, and industry decision-makers. |
362 |
| 60 |
Society of Defense Financial Management (SDFM)sdfm.org
A non-profit organization for military comptrollership, promoting education, training, research, and professional development for financial management in the Department of Defense and Coast Guard |
357 |
| 61 |
Titan Corporationl3harris.com
Former defense contractor turned technology company, specializing in wireless communications, information systems, and electron beam technology for food safety Acquired by L-3 Communications in 2005 |
355 |
| 62 |
Zeta Associateszai.com
A leading provider of complex communications signals collection and processing systems for the Intelligence and Defense communities worldwide Employing innovative DSP solutions |
345 |
| 63 |
Curtiss-Wright Defense Solutionscurtisswrightds.com
A leading supplier of rugged electronics products for defense, aerospace, and security applications, specializing in innovative solutions for harsh conditions |
340 |
| 64 |
Patriot Group International LLC.patgroupi.com
Global mission support provider with expeditionary capabilities serving intelligence, defense, and private sectors in 17+ countries Committed to ethical and quality service Leadership from special operations and intelligence backgrounds |
334 |
| 65 |
RiverTech, an Akima Companyakima.com
A global provider of solutions in space, warfighter support, training, and maritime operations, ensuring exceptional performance in complex and evolving battlespaces |
332 |
| 66 |
ICI Services Corporationicisrvcs.com
Employee-owned business providing engineering, management, and logistics services to US Military and Homeland Security with a focus on quality, customer satisfaction, and employee development |
324 |
| 67 |
Davis Defense Group, Inc.davisdefense.com
Aerospace and defense contractor providing analytical, advisory, technical, and support services to Department of Defense with commitment to excellence and integrity |
324 |
| 68 |
PE Systems, Inc.pesystems.com
Technical capabilities provider with flexible, mission-oriented teams meeting customer requirements Certified SDVOB & MOB, offering great benefits and recognized as Best Place to Work in Dayton |
323 |
| 69 |
T-Solutions, Inc.tsoln-inc.com
A woman, veteran-owned business offering maintenance engineering, logistics, and management services globally to commercial and government clients, specializing in technical solutions and innovative capabilities |
311 |
| 70 |
AFCEA Internationalafcea.org
Nonprofit organization for ethical information exchange, knowledge increase for defense, homeland security, and intelligence communities in IT, communications, and electronics. |
295 |
| 71 |
Prescient Edgeprescientedge.com
A global solutions integrator offering intelligence analysis, training, security, and technology R&D support to the Department of Defense and Intelligence Community |
273 |
| 72 |
Xator Corporationparsons.com
Provider of mission-focused C4ISR solutions for US Government clients, specializing in intelligence, critical infrastructure protection, training, and strategic management |
267 |
| 73 |
SES Space & Defensesessd.com
Equipping governments with integrated satellite and connectivity solutions, delivering resilient, future-proof capabilities across every mission, landscape, and orbit. |
250 |
| 74 |
Threat Tec, LLCthreattec.com
Specializing in threat analysis, wargaming, and simulations, we provide comprehensive insights to help clients stay ahead in global security challenges |
249 |
| 75 |
Falconwood, Incorporatedfalconwood.biz
A small, woman-owned business offering executive consultants and program support for Department of Defense IT initiatives, specializing in acquisition strategy and Information Assurance |
248 |
| 76 |
Metron Inc.metsci.com
Provider of research, scientific, and software solutions for government and commercial markets Specializing in data analytics, autonomous solutions, and remote sensing systems |
242 |
| 77 |
Dedronededrone.com
Global leader in smart airspace security using AI/ML technology to detect, track, identify, analyze, and mitigate drone threats for various customers worldwide |
231 |
| 78 |
AEgis, a BlueHalo Companybluehalo.com
Specializing in Space Superiority, Directed Energy, Missile Defense, C4ISR, Cyber, and Intelligence solutions, this company provides industry-leading mission capabilities |
228 |
| 79 |
A-T Solutions, now part of PAEamentum.com
A-T Solutions, now a part of PAE, is dedicated to providing security and defense solutions Visit wwwlinkedincom/company/pae for more information |
209 |
| 80 |
JB Management, Inc. (JBM)gojbm.com
A Veteran Owned Small Business providing programmatic, planning, operations, maintenance, training, system integration, engineering, and information operations services worldwide |
185 |
| 81 |
Core Onecoreone.com
Specializing in national security, we provide advanced analytical, operational, and technical solutions to complex challenges through trusted partnerships and superior advice |
183 |
| 82 |
Prism Maritimeprismmaritime.com
A maritime support services provider for the US Government, offering consulting, program management, installation, and technical services for testing new technologies/systems |
180 |
| 83 |
The Wexford Groupcaci.com
A consulting firm offering specialized services to governments, military, law enforcement, and commercial enterprises, focusing on security challenges with integrity |
180 |
| 84 |
MLT Systemsmltsystems.com
A veteran-owned small business providing program strategies, acquisition, life cycle management, and engineering solutions to support the defense industry |
179 |
| 85 |
Obsidian Solutions Groupobsidiansg.com
An 8(a) certified firm specializing in IT Transformation, Software Development, Data Management, and Professional Solutions for the DoD and Intelligence Community |
178 |
| 86 |
ESP, LLCsev1tech.com
Sev1Tech offers a range of capabilities and services through their entity, ESP Follow them on LinkedIn for more information |
175 |
| 87 |
In-Depth Engineering Corporationindepth.com
Small business providing combat system development, integration, testing, and waterfront support to the US Department of Defense with expertise in software solutions and IT services |
174 |
| 88 |
PD Systemspd-sys.net
Specializing in logistics, maintenance, and training support services, PD Systems is a systems integration firm with technology-enhanced domain expertise Visit their website for more information |
172 |
| 89 |
Fairlead Integratedfairleadint.com
Veteran-owned small business supplying integrated electrical and control systems, large-scale mechanical fabrications, precision machined components, and mobile containerized products for military ships and boats |
170 |
| 90 |
Chenega Federal Systemschenegafederal.com
Provider of professional services in engineering, military, intelligence, and IT sectors to the Federal Government, with expertise, financial backing, and Fortune 500 alliances |
169 |
| 91 |
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 |
| 92 |
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 |
| 93 |
GLOBAL Integrated Securityglobalgroup-gis.com
This company provides comprehensive security and operational support to US defense and intelligence agencies, integrating intelligence with security systems worldwide |
166 |
| 94 |
Silver Wingsaas-sw.org
National, co-ed organization focused on developing civilian leaders with aerospace knowledge through community service and education about national defense |
165 |
| 95 |
Tech Wizardstech-wizards.com
A creative system and software engineering company offering innovative solutions with full life cycle support using state-of-the-art processes and methodologies |
163 |
| 96 |
LMT Inc.lmt-inc.com
A mathematic optimization company transforming data into actionable insights for businesses and governments, offering forecasting, operations support, and expeditionary services |
162 |
| 97 |
Schafer Corporation
A high-end technical solutions provider that supports customers in meeting goals, values integrity and innovation, and fosters employee success and innovation |
161 |
| 98 | 161 | |
| 99 |
Artisartisllc.com
A research and development company specialized in innovative technologies for government clients, focusing on active protection systems, sensors, embedded systems, and autonomous safety systems |
161 |
| 100 |
Chenega Professional Services Strategic Business Unitchenegaps.com
Specializing in IT, health, engineering, and administrative services for federal agencies, providing certified processes and support to various government departments |
157 |
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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
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