| # | Company | Employees |
|---|---|---|
| 1 |
United States Marine Corpsmarines.mil
Provides rapid deployment of combined-arms task forces using naval mobility for power projection on land, sea, and air. |
78,275 |
| 2 |
NASA - National Aeronautics and Space Administrationnasa.gov
A pioneering organization pushing the boundaries of space exploration, scientific discovery, and aeronautics research to benefit humanity and improve life on Earth |
50,817 |
| 3 |
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 |
| 4 |
United States Department of the Air Forceaf.mil
A military department of the US Department of Defense that oversees the organization of the United States Air Force and United States Space Force |
5,392 |
| 5 |
U.S. Naval Research Laboratorynrl.navy.mil
Conducts scientific research with applications for the Department of the Navy, the Defense Department and the nation, driving innovative advances for the U.S. Navy and Marine Corps. |
3,372 |
| 6 |
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 |
| 7 |
National Nuclear Security Administration (NNSA)energy.gov
A semi-autonomous agency within the US Department of Energy, dedicated to safeguarding the nation's nuclear stockpile, promoting global security, and addressing emerging challenges |
1,701 |
| 8 |
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 |
| 9 |
Air Forcelinkedin.com
Specializing in aviation defense, providing air support and protection for national security and military operations Offering expertise in air combat and security strategies |
840 |
| 10 |
United States Department of the Air Forceaf.mil
This company is one of the three Military Departments in the US Department of Defense, encompassing the USAF and USSF |
840 |
| 11 |
LBSversar.com
Versar Global Solutions provides comprehensive lifecycle solutions for government and commercial clients in natural, built, and digital environments worldwide |
802 |
| 12 |
Commander, Navy Installations Command (CNIC) HQcnic.navy.mil
The company is responsible for worldwide US Navy shore installation management, ensuring readiness and quality of life programs for military personnel and their families |
789 |
| 13 |
Fincantieri Marine Groupfincantierimarinegroup.com
Leading US shipbuilder in naval and commercial sectors with 3 shipyards Specializes in building Navy ships, merchant vessels, and aluminum boats |
780 |
| 14 |
Metreametrea.aero
Provider of defense capabilities and services, specializing in innovative solutions for various missions including ISR, electromagnetic technologies, and simulations applications |
767 |
| 15 |
USAF Civil Engineer
The company's core mission is to build, operate, maintain, modernize, and recover installations, developing creative solutions to complex problems worldwide |
648 |
| 16 | 535 | |
| 17 |
Defense Security Cooperation Agencydsca.mil
Facilitating foreign security forces building capacity to respond to shared challenges, supporting US policy interests through security cooperation programs, and fostering alliances |
480 |
| 18 |
Gryphon Technologies, Incgryphontechnologies.com
A transformational leader in digital engineering and technical solutions for national security, specializing in research, development, defense systems, cybersecurity, and logistics |
457 |
| 19 |
Naval Reactorsenergy.gov
Develops and maintains nuclear propulsion plants for the US Navy, ensuring safe and reliable operations through rigorous design practices and operating procedures |
426 |
| 20 |
F-35 Joint Program Officejsf.mil
The company designs affordable next generation strike aircraft weapon systems for military branches and allies, utilizing cutting-edge technologies for the future battlespace |
375 |
| 21 |
Computer World Services Corp. (CWS)cwsc.com
A trusted provider of enterprise IT solutions to federal Defense and Civilian customers with a focus on cybersecurity, cloud services, and software development |
340 |
| 22 |
Navy Enterprise Business Solutions (NAVEBS)navy.mil
Provider of Navy Enterprise Business Solutions including Electronic Procurement, Labor Data Collection, and Enterprise Resource Planning software systems |
338 |
| 23 |
GM Defensegmdefensellc.com
Provider of integrated vehicles, power, propulsion, autonomy, mobility, and security solutions in aerospace, defense, and security markets worldwide |
324 |
| 24 |
Windwardwindward.ai
Provides AI-powered maritime intelligence platform automating operations, mitigating risks, and enabling organizations to navigate complex global trade confidently and efficiently. |
261 |
| 25 |
CSSIcssiinc.com
Providing safety critical systems support and modernization for transportation and defense sectors, enhancing efficiency and infrastructure safety nationwide. |
255 |
| 26 |
Hydrosathydrosat.com
The company offers daily high-resolution thermal data and analytics for applications in food security, public safety, and environmental monitoring |
108 |
| 27 |
Akira Technologiesakira-tech.com
A data and cloud technology company specializing in modernizing, unifying, and innovating solutions for Federal Government agencies to unlock sustainable value |
81 |
| 28 |
United States Air Force Logistics, Engineering and Force Protectionaf.mil
The company's staff supports DAF mission success by setting policy, allocating resources, and aligning efforts to achieve DoD and DAF priorities |
7 |
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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 Nov 2, 2026.
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