| # | Company | Employees |
|---|---|---|
| 1 |
United States Air Forceairforce.com
Protects interests through air and space superiority, conducting global attacks, rapid mobility, precision engagement, information dominance, and agile combat support across multiple dimensions. |
243,929 |
| 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 |
General Dynamics UKgd.com
A global company focusing on safety and security, producing a range of products from business jets to submarines with a culture of continuous improvement |
100,000 |
| 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 |
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 |
| 6 | 48,589 | |
| 7 |
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 |
| 8 | 36,645 | |
| 9 |
L3Harris Technologiesl3harris.com
Global provider of end-to-end technology solutions across space, air, land, sea and cyber domains to address mission-critical national security requirements. |
31,265 |
| 10 |
CACI International Inccaci.com
providing advanced technology and expert services to address complex national security challenges for government and defense sectors |
22,223 |
| 11 |
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 |
| 12 |
L3 Technologiesl3harris.com
Develops advanced defense technologies and commercial solutions in pilot training, aviation security, night vision, weapons, maritime systems and space for worldwide deployment. |
15,734 |
| 13 |
Sandia National Laboratoriessandia.gov
National security science and engineering laboratory focused on nuclear defense, biotechnology, environmental preservation, energy systems, and cyber security through innovative research and development. |
12,092 |
| 14 |
General Atomicsga.com
Development of advanced technology solutions including unmanned aerial vehicles, research reactors, aircraft systems, MagLev transport, and fusion energy for global customers. |
11,213 |
| 15 | 11,084 | |
| 16 |
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 |
| 17 |
United States Department of the Navynavy.mil
This organization is part of the Navy and is involved in activities related to naval operations, defense, and national security |
9,503 |
| 18 |
General Dynamics Electric Boatgdeb.com
Design and build nuclear-powered submarines for the U.S. Navy, including Virginia-class and Columbia-class ballistic missile submarines. |
9,481 |
| 19 |
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 |
| 20 |
Anduril Industriesanduril.com
Transforms military capabilities through advanced technology and rapid R&D, delivering off-the-shelf products and path-making systems to support warfighters and allied defense operations. |
8,658 |
| 21 | 7,949 | |
| 22 |
Johns Hopkins Applied Physics Laboratoryjhuapl.edu
University-affiliated research center providing technical expertise, prototyping, research, development, and analysis for national security and scientific challenges. |
7,850 |
| 23 |
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. |
7,687 |
| 24 |
Harris Corporationl3harris.com
A leading technology innovator providing solutions in communication systems, electronic systems, and space and intelligence systems to connect, inform, and protect globally |
7,430 |
| 25 |
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 |
| 26 |
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 |
| 27 |
United States Space Forcespaceforce.mil
Organizes, trains, and equips space forces to protect national interests, acquires military space systems, and develops professional doctrine for specialized combatant commands. |
6,087 |
| 28 |
Curtiss-Wright Corporationcurtisswright.com
Global manufacturer providing highly engineered products and advanced technology solutions for critical functions within international commercial, industrial, defense, and energy market sectors. |
5,835 |
| 29 |
Naval Sea Systems Command (NAVSEA)navsea.navy.mil
Engineering, building, purchasing, and maintaining ships, submarines, and combat systems to fulfill operational requirements for the fleet through command staff and headquarters directorates. |
5,551 |
| 30 |
Sierra Nevada Corporationsncorp.com
Mid-tier aerospace contractor providing innovative protection solutions through command and control systems, ISR, cyber, and electromagnetic spectrum management across all mission domains. |
5,203 |
| 31 |
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 |
| 32 |
National Security Agencynsa.gov
Provides foreign signals intelligence to policymakers and military forces while securing national security systems and weaponry through advanced cybersecurity and computer operations. |
4,637 |
| 33 | 4,234 | |
| 34 |
Aerojet Rocketdynel3harris.com
Innovative technologies now part of L3Harris Technologies, leading in advancements and developments in various industries Follow for updates on progress |
4,147 |
| 35 | 4,088 | |
| 36 |
MIT Lincoln Laboratoryll.mit.edu
Research and development center applying advanced technology to national security problems, focusing on long-term innovation and rapid prototyping. |
4,083 |
| 37 |
NASA Goddard Space Flight Centernasa.gov
A major US laboratory developing and operating unmanned scientific spacecraft for NASA's Earth observation, astronomy, planetary science, and astrophysics missions |
4,049 |
| 38 |
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 |
| 39 |
Naval Nuclear Laboratory (FMP)navalnuclearlab.energy.gov
The company operates the Naval Nuclear Laboratory, supporting the US Naval Nuclear Propulsion Program through research, development, training, and technical support |
3,940 |
| 40 |
Puget Sound Naval Shipyardnavsea.navy.mil
A naval shipyard and maintenance facility ensuring high quality, on-time maintenance, modernization, and support for the Navy's fleet to preserve national security |
3,797 |
| 41 |
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 |
| 42 | 3,282 | |
| 43 |
NAVWARnavwar.navy.mil
This company specializes in providing information warfare capabilities and services to support naval, joint, coalition, and national missions |
3,228 |
| 44 |
Defence Equipment & Support (DE&S)des.mod.uk
Procures essential equipment, clothing, food, and vehicles for the Royal Navy, British Army, and Royal Air Force through specialized military and civilian personnel. |
3,206 |
| 45 |
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 |
| 46 |
United Launch Alliance (ULA)ulalaunch.com
providing reliable, accurate rocket launch services with advanced technology, high performance, and affordability for diverse payload delivery. |
3,185 |
| 47 |
Naval Supply Systems Command (NAVSUP)navsup.navy.mil
This company provides supplies, services, and quality-of-life support to the Navy and Joint warfighter, managing supply chains and administering various programs for Sailors |
3,169 |
| 48 | 3,124 | |
| 49 | 3,123 | |
| 50 |
Kratos Defense and Security Solutionskratosdefense.com
National security technologies spanning unmanned systems, hypersonics, satellite communications, cyber defense, and propulsion systems for rapid deployment to support various military domain missions. |
2,950 |
| 51 |
Draperdraper.com
A nonprofit engineering innovation company advancing technologies for national security through collaboration with government, academia, and industry to solve complex challenges |
2,932 |
| 52 |
SRCsrcinc.com
A not-for-profit R&D company tackling defense, environment, and intelligence challenges through innovative solutions, technology, and expertise since 1957 |
2,790 |
| 53 | 2,744 | |
| 54 |
Naval Surface Warfare Center (NSWC)navsea.navy.mil
The NAVSEA Warfare Centers deliver innovative technical solutions for the US Navy, focusing on undersea and surface warfare capabilities |
2,707 |
| 55 |
Portsmouth Naval Shipyardnavsea.navy.mil
Specializes in the safe overhaul, repair, and modernization of nuclear-powered attack submarines for the US Navy, focusing on Los Angeles and Virginia-class submarines |
2,662 |
| 56 | 2,526 | |
| 57 | 2,466 | |
| 58 |
NAVSEA Warfare Centers (NSWC/NUWC)navsea.navy.mil
A trusted technical expert delivering innovative solutions and sea power to the US Navy through research, engineering, and fleet support |
2,369 |
| 59 |
Mercury Systemsmrcy.com
A technology company pushing processing power to the tactical edge for aerospace and defense missions, enabling innovation and decision superiority worldwide |
2,300 |
| 60 |
Systems Planning & Analysisspa.com
Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. |
2,242 |
| 61 |
Y-12 National Security Complexy12.doe.gov
Specializes in manufacturing components, subassemblies, and quality evaluations for US nuclear deterrence, weapons threat reduction, naval reactors, and national security solutions |
2,242 |
| 62 |
Textron Systemstextronsystems.com
Innovative solutions provider to defense, homeland security, and aerospace sectors Specializing in unmanned aircraft, marine craft, armored vehicles, and intelligence software |
2,084 |
| 63 |
Ball Aerospacebaesystems.com
Expertise in spacecraft, instruments, ground systems, sensors, tactical systems, operations, and data analytics to support customer missions. |
2,061 |
| 64 |
DCS Corpdcscorp.com
Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. |
2,043 |
| 65 |
Thales Defense & Security, Inc.thalesdsi.com
Global provider of innovative solutions for defense, federal, and commercial markets including communication systems, sonar systems, data protection, and technology integration for various domains |
2,013 |
| 66 |
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 |
| 67 |
Teledyne FLIRflir.com
Designs and manufactures thermal imaging systems, visible-light sensors, unmanned platforms, and CBRN detection solutions for defense, industrial, and public safety applications worldwide. |
1,999 |
| 68 |
PRIVADA Global Incorporated | PRIVADA Virtual Solutionsconsent.youtube.com
Specializes in private practice management, healthcare administration, healthcare IT services, and consulting for small businesses, handling everything from admin to marketing |
1,956 |
| 69 |
Missile Defense Agencymda.mil
Research, development, and acquisition of integrated, layered defense systems protecting national interests and international allies against ballistic missile threats in all flight phases. |
1,955 |
| 70 |
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 |
| 71 |
Hill Air Force Base
A computer & network security company based in Utah, specializing in services for Hill Air Force Base in Ogden |
1,891 |
| 72 |
Elbit Systems of America26defense.com
High performance electronics and system solutions for defense, homeland security, commercial aviation, and medical instrumentation markets across numerous facilities throughout the United States. |
1,874 |
| 73 |
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 |
| 74 |
Astrionastrion.us
Delivers integrated technology solutions, cyber security, and systems engineering services for defense, homeland security, intelligence, and space missions through mission support and agility. |
1,789 |
| 75 |
SSLsslmda.com
Designs, manufactures advanced spacecraft for communication, exploration, and observation. Develops state-of-the-art small satellites, robotics, and autonomous solutions for remote operations. |
1,787 |
| 76 |
Alutiiq, LLCalutiiq.com
An Alaska Native Corporation and its subsidiaries offer diverse services to customers with exceptional capabilities and premier service |
1,751 |
| 77 |
JT4jt4llc.com
Provides engineering and technical support to US Air Force, Space Force, and Navy test ranges, preparing aircraft, weapons systems, and air crews for missions |
1,742 |
| 78 |
AAI Corporationtextronsystems.com
This company develops and integrates products and services for aerospace, defense, law enforcement, security, and critical infrastructure protection worldwide |
1,655 |
| 79 |
Dynetics, Inc.leidos.com
Provider of engineering, scientific, and IT solutions for national security, cybersecurity, space, and critical infrastructure sectors with specialized technical services and products |
1,645 |
| 80 |
SIG SAUER, Inc.sigsauer.com
Manufacturer of firearms, electro-optics, ammunition, and suppressors providing elite tactical training and remote weapons stations for military, law enforcement, and civilian markets. |
1,624 |
| 81 |
Pearl Harbor Naval Shipyard & IMFnavsea.navy.mil
A regional maintenance center in Hawaii specializing in environmentally responsible ship repairs and overhauls for the US Navy |
1,622 |
| 82 |
Oshkosh Defenseoshkoshdefense.com
Design, production, and sustainment of heavy, medium, and light military vehicles plus mobility systems with global logistics and life cycle fleet support. |
1,610 |
| 83 |
Versar Global Solutionsversar.com
A Washington, DC-based company provides full lifecycle solutions for government and commercial Customers in natural, built, and digital environments worldwide |
1,603 |
| 84 |
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 |
| 85 | 1,535 | |
| 86 |
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 |
| 87 |
Defense Threat Reduction Agencydtra.mil
Support DoD and international partners in countering and deterring weapons of mass destruction and emerging global threats. |
1,506 |
| 88 |
All Starall-star.com
A privately owned firm specializing in aerospace support, facilities maintenance, military housing, logistics, construction, and fleet maintenance for military, government, and commercial contracts |
1,501 |
| 89 | 1,485 | |
| 90 |
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 |
| 91 |
Pantex Plantpantex.energy.gov
A company with over 75 years of service to the nation, managed by Consolidated Nuclear Security for the Department of Energy/National Nuclear Security Administration |
1,471 |
| 92 |
Engility Corporationsaic.com
A premier technology integrator based in Reston, Virginia, providing information about SAIC through their linkedin page |
1,414 |
| 93 |
Moog Space and Defensemoog.com
A leading provider of motion and flow control solutions for space, defense, power, and data applications, including satellites, military vehicles, and naval vessels |
1,410 |
| 94 |
IntrepidGSintrepidgs.com
A global provider of logistics, facilities management, and professional services, specializing in solving challenges for public and private sector customers worldwide |
1,409 |
| 95 |
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 |
| 96 |
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 |
| 97 |
U.S. Army DEVCOM Soldier Centersc.devcom.army.mil
Innovative science and technology solutions for US Army Soldiers to optimize performance, survivability, mobility, and combat effectiveness through various focus areas |
1,367 |
| 98 |
Torch Technologies, Inc.torchtechnologies.com
Employee-owned business, consistently recognized for strong performance, positive workplace culture, and ethical practices in consulting and professional services. |
1,338 |
| 99 |
Maxar Technologiesvantor.com
Provider of secure, precise geospatial insights using advanced satellite imagery and AI software to support global safety and disaster response. |
1,325 |
| 100 |
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 |
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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.
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