| # | Company | Employees |
|---|---|---|
| 1 |
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 |
| 2 |
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 |
| 3 |
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 |
| 4 |
NAVWARnavwar.navy.mil
This company specializes in providing information warfare capabilities and services to support naval, joint, coalition, and national missions |
3,228 |
| 5 | 3,123 | |
| 6 |
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 |
| 7 |
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 |
| 8 |
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 |
| 9 |
Naval Information Warfare Center Pacificniwcpacific.navy.mil
A technological support center for the US military branches, specializing in information warfare, cyber domain, autonomous unmanned systems, and communication technologies |
1,266 |
| 10 |
Vastvastspace.com
development of commercial space stations including Haven-1 and Haven-2, enabling long-term human habitation and microgravity research in space |
1,174 |
| 11 |
Millennium Space Systemsmillennium-space.com
The company specializes in creating affordable prototype and constellation solutions for critical space systems with a fast delivery time |
939 |
| 12 |
Karman Space & Defensekarman-sd.com
Supplier of metallic and composite flight hardware and sub-assemblies for space, missile, and hypersonic markets, offering comprehensive supply chain solutions. |
760 |
| 13 |
Epsilon Systems Solutions, Inc.epsilonsystems.com
A diversified professional services company serving defense and commercial customers worldwide, specializing in ship modernization, technical solutions, and mission readiness support |
686 |
| 14 |
Logistic Services International, Inc.lsijax.com
Provides aviation and training solutions for foreign militaries operating U.S. Navy aircraft and systems, supporting DoD and Homeland Security. |
586 |
| 15 |
Fleet Readiness Center Southwestnavair.navy.mil
Premier maintenance organization in the Department of Defense, specializing in aircraft and ship engine repair to support the Marines and Navy |
547 |
| 16 | 512 | |
| 17 |
Cubic Defensecubic.com
This company delivers technology-driven solutions for C5ISR and training customers worldwide, specializing in C4ISR solutions for all-domain operations and advanced training innovations |
486 |
| 18 |
Hadrianhadrian.co
This company builds software-defined precision component factories for aerospace customers, currently expanding and hiring machinists and engineers to join their team |
475 |
| 19 |
Impulse Spaceimpulsespace.com
Developing and operating a fleet of cost-effective, high-performance space vehicles to reliably and rapidly transport customers to their desired destinations beyond Earth. |
463 |
| 20 | 453 | |
| 21 |
INDUS Technology, Inc.industechnology.com
Provider of C4I capabilities and support services to the Federal government and industry, including engineering, IT, logistics, program management, and financial management ISO 9001:2008 certified |
439 |
| 22 |
Naval Surface Warfare Center, Corona Divisionnavsea.navy.mil
Providing transparency to warfighting readiness through data analytics, engineering Fleet training environments, and ensuring measurement accuracy for Naval operations |
437 |
| 23 |
Space Systems Commandssc.spaceforce.mil
Develops, acquires, and fields resilient space capabilities while managing launch operations, developmental testing, and sustainment for military satellite constellations and defense systems. |
416 |
| 24 |
Pixxelpixxel.space
Operating highest-resolution commercial hyperspectral imaging constellation. Delivering sharper insights for agriculture, energy, environment, and mining sectors. Aims for a healthier planet. |
364 |
| 25 |
Loft Orbitalloftorbital.com
Builds space infrastructure enabling any entity to use space. Develops a standardized, configurable satellite platform with turnkey hardware and software for customer missions. |
355 |
| 26 |
Apex - Satellite Platformsapexspace.com
Manufacturing satellite buses for commercial spacecraft, enabling various uses from earth observation to communications, in the rapidly growing aerospace industry |
345 |
| 27 |
VACCO Industriesvacco.com
Designs, manufactures specialty valves, metal filters, advanced fluid control products for mission-critical space, defense, commercial, industrial applications. Ocean depths to deep space. |
339 |
| 28 |
Stratolaunchstratolaunch.com
Specializing in advanced aerospace vehicle design, manufacturing, and operations to enhance access to space and advance hypersonic vehicle capabilities |
337 |
| 29 |
Stellar Solutionsstellarsolutions.com
An engineering services company providing technical expertise and problem solving for national and international aerospace programs, defense projects, and satellite missions |
313 |
| 30 |
Mach Industriesmachindustries.com
Developing advanced defense technology with a focus on stealth capabilities to create the next generation of defense systems |
291 |
| 31 |
Applied Aerospaceapplied-ad.com
AASC provides complex composite and metal bonded structures and assemblies for aerospace industry, with expertise in fabrication, testing, and certification |
256 |
| 32 |
Epirusepirusinc.com
A high-growth technology company developing solid-state, software-defined directed energy systems for counter-electronics effects and power management solutions in defense and commercial applications |
251 |
| 33 |
Varda Space Industriesvarda.com
Developing infrastructure for manufacturing products in orbit, including pharmaceutical processing and reentry capsules, to benefit life on Earth. |
248 |
| 34 |
K2 Space Corporationk2space.com
The company specializes in achieving missions that were once deemed impossible, pushing boundaries and achieving remarkable feats |
245 |
| 35 |
Kestrel Enterprises, Inc.boeing.com
A leading aerospace company offering commercial jetliners, defense systems, satellites, and military aircraft, with a focus on innovation and customer satisfaction |
237 |
| 36 |
Turion Spaceturionspace.com
Designing, building, and operating spacecraft for national security and commercial missions, addressing space domain awareness, in-space servicing, and debris mitigation. |
220 |
| 37 |
Capella Spacecapellaspace.com
Provides high-resolution SAR satellite imagery and data solutions for government and commercial use, offering global insights for various industries. |
213 |
| 38 |
Affordable Engineering Servicesaffordservices.com
A premier defense contractor providing high-quality engineering and aviation maintenance services to support warfighter-readiness and military missions worldwide |
209 |
| 39 |
Castelioncastelion.com
Innovative defense company specializing in rapid design, testing, and modern manufacturing of long range strike weapons for competitive advantage and deterrence |
195 |
| 40 |
Armtec Defense Technologiesarmtecdefense.com
A leader in aerospace and defense products, specializing in subcomponents for ordnance, decoy countermeasure flares, and radar countermeasure chaff |
186 |
| 41 |
Vannevarvannevarlabs.com
Specializing in digital defense, the company provides protections and solutions for the modern age of cyber security |
182 |
| 42 |
Vitesse Systemsvitessesys.com
Connecting sensing to action across the connected battlespace, customers sense threats, understand complex conditions, act with greater speed, precision and confidence. |
177 |
| 43 |
General Atomics Systems Integrationga-si.com
Provider of defense services for US and International customers, offering field support solutions and engineering expertise for aircraft systems and equipment Headquarters in Poway, California |
166 |
| 44 |
Northwoodnorthwoodspace.io
Development of advanced, scalable ground network using phased array technology to enhance satellite communication connectivity and operational resilience. |
152 |
| 45 |
LeoLabsleolabs.space
Dedicated to protecting satellites in low Earth orbit. Builds and operates radars to track satellites and threatening debris for responsible stewardship. |
151 |
| 46 |
Astrolabastrolab.space
Astrolab pioneers new ways of exploring distant planets with a fleet of commercial planetary rovers, focusing on reliability, diversity, and impact in planetary exploration |
151 |
| 47 |
Thomas Global Systemsthomas-global.com
A global leader in aerospace and defense electronic systems, specializing in advanced flight displays, avionics, armored vehicle electronics, and mission systems |
97 |
| 48 |
Iris Technologyiristechnology.com
Empowers exploration, defense, discovery with advanced tactical systems, space electronics, secure communications, intelligence, imaging, electro-optics for mission-critical teams. Industrial, life science applications. |
92 |
| 49 |
Martinez & Turek, Inc.mandtinc.com
Provider of engineering and manufacturing services, specializing in design, analysis, fabrication of large structures, and complex hardware for aerospace and defense industries |
87 |
| 50 | 81 | |
| 51 |
Trio Manufacturing, Inc.triomfg.com
Privately held manufacturing company based in El Segundo, CA, specializing in high-quality, cost competitive solutions with state-of-the-art technologies and exceptional customer service |
64 |
| 52 |
GITAIgitai.tech
Space robotics startup developing safe, affordable robotic labor for lunar/Martian habitat construction, resource mining, expanding humanity beyond Earth through proven in-space technology. |
62 |
| 53 |
Thomson CSFnokia.com
A technology company specializing in defense, security, and aerospace systems, providing advanced solutions for military and civil applications |
56 |
| 54 |
ABL Space Systemsablspacesystems.com
Designing and building rockets specifically optimized for launching small satellites into orbit to provide reliable and efficient space access for customers. |
56 |
| 55 |
Array Labsarraylabs.io
Developing next-generation earth observation satellites to provide high quality 3D imagery in near-real time for various industries |
51 |
| 56 |
Morpheus Spacemorpheus.space
This company specializes in unlocking satellite mobility through innovative electric propulsion systems, mission analysis tools, and flexible pay-as-you-go options for missions |
48 |
| 57 |
ExoAnalytic Solutionsexoanalytic.com
A scientific, engineering, and technology company offering products and services to the defense industry, aerospace firms, Fortune 500 companies, and other commercial enterprises |
39 |
| 58 |
Mindrummindrum.com
This company manufactures specialized components and assemblies from difficult and exotic materials, employing advanced machining, grinding, and assembly techniques for various industries. |
36 |
| 59 |
Optiforms, Inc.optiforms.com
Leader in precision optical components manufacturing for various industries Expertise in design innovation and product development, exceeding client expectations |
32 |
| 60 |
NovaWurks, Inc.novawurks.com
Pioneering spacecraft manufacturer offering end-to-end solutions for government and commercial customers, including design, manufacturing, launch coordination, and flight operations with revolutionary SLEGO building blocks. |
29 |
| 61 |
Ron Witherspoon, Inc.rwinc.com
A precision manufacturing company in Silicon Valley providing quality products, specializing in aerospace, defense, and medical industries with ITAR approval and ISO 9001 certification |
28 |
| 62 |
Phase Fourphasefour.io
Develops and manufactures propulsion systems for satellites to address reliability and cost issues, enabling satellite constellation growth with high-performance, long-lifespan solutions. |
23 |
| 63 |
DeepSatdeepsat.com
Provides real-time intelligence via advanced VLEO satellite constellation. Delivers high-resolution imaging, persistent coverage, and in-orbit AI for critical decision-making. |
12 |
| 64 |
IMG INTA, LLC (An Ichor Systems Company)intatech.com
An innovative company providing engineered solutions in materials, offering services from precision manufacturing to plating and welding for global industries |
6 |
| 65 |
Orbits Lightwave Incorbitslightwave.com
A privately held company based in Pasadena, California, designing and manufacturing Fiber Lasers for sensing, LIDAR, test, and coherent communications applications |
3 |
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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.
More company lists in California
- The largest companies in California 12,813
- SaaS companies in California 1,617
- Software Development companies in California 1,386
- Venture capital and private equity firms in California 786
- IT Services and IT Consulting companies in California 730
- Venture Capital and Private Equity Principals companies in California 645
- AI companies in California 606
- AI-native companies in California 552
- Retail chains in California 527
- Hospitals and Health Care companies in California 519
- Financial Services companies in California 513
- Financial services firms in California 503
- Education providers in California 498
- IT services companies in California 428
- Manufacturers in California 417
- Technology, Information and Internet companies in California 413
- Higher Education companies in California 376
- Public sector organisations in California 337
- Hardware manufacturers in California 335
- Critical infrastructure operators in California 293
- Government Administration companies in California 279
- Healthcare providers in California 277
- Education Administration Programs companies in California 277
- Real Estate companies in California 275
The same list elsewhere in United States
- Defense and Space Manufacturing companies in the United States 564
- Defense and Space Manufacturing companies in Virginia 120
- Defense and Space Manufacturing companies in Alabama 48
- Defense and Space Manufacturing companies in Colorado 28
- Defense and Space Manufacturing companies in Florida 28
- Defense and Space Manufacturing companies in Massachusetts 25
- Defense and Space Manufacturing companies in Maryland 24
- Defense and Space Manufacturing companies in Huntsville 30