These Arlington companies with in-house R&D are primarily large firms in the aviation, aerospace, and defense sectors. RTX, Boeing, Raytheon, Leonardo DRS, TSC, AV, and DARPA all operate in this sphere, developing advanced systems for military and commercial applications. The presence of the University of Texas at Arlington also highlights a strong connection to research and development.
Beyond defense, CoStar Group focuses on real estate information and analytics, while Accenture Federal Services provides IT consulting to the government. Fluence is active in renewable energy storage, and Oil States Industries offers equipment for energy and military markets. The concentration of defense and aerospace companies reflects a significant industry cluster in Arlington.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 139,657 | ||||
| 2 |
Boeingboeing.com
A global aerospace leader providing commercial airplanes, defense, space systems, and services, focused on innovation, customer delivery, and employee growth |
129,130 | |||
| 3 | 48,589 | ||||
| 4 |
CoStar Groupcostargroup.com
A leading provider of online real estate marketplaces, information, and analytics for commercial and residential properties, with a global presence |
11,725 | |||
| 5 |
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 | |||
| 6 |
The University of Texas at Arlingtonuta.edu
A growing research powerhouse committed to discovery, innovative instruction, and community engagement, improving quality of life in Texas and beyond |
9,020 | |||
| 7 |
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 | |||
| 8 | 2,526 | ||||
| 9 | 2,466 | ||||
| 10 |
Fluencefluenceenergy.com
Global leader in energy storage products and services, providing modular solutions, comprehensive services, and AI-enabled software for managing renewable energy and storage |
1,962 | |||
| 11 |
Oil States Industriesoilstates.com
A technology company advancing the energy future with innovative equipment, systems, and services for energy, industrial, and military markets worldwide |
1,356 | |||
| 12 |
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 | |||
| 13 |
NRECAelectric.coop
Promotes, supports, and protects interests of electric cooperatives; advocates for safe, reliable, affordable electric service; researches new energy technologies; promotes global rural electrification. |
1,085 | |||
| 14 |
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 | |||
| 15 |
Gerbernestlejobs.com
A leader in early childhood nutrition, providing research-based products, nutrition education, and services for infants and toddlers Joined Nestl茅 in 2007 |
768 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Iscar Metalsiscarmetals.com
Iscar Metals is a company that specializes in manufacturing metal cutting tools and providing innovative metalworking solutions to various industries |
703 | |||
| 17 |
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 | |||
| 18 |
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 | |||
| 19 |
Core4cecore4ce.com
Mission-oriented company serving national security community by building, modernizing, and defending digital infrastructure with expertise in cyber operations, modernization, engineering, and analysis |
599 | |||
| 20 |
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 | |||
| 21 |
MicroPort Orthopedicsmicroportortho.com
A global orthopedic company focused on improving patient outcomes, provider satisfaction, and advancing knee and hip implants through innovation and superior clinical results |
549 | |||
| 22 |
Mack Molding Companymack.com
A Vermont-based company providing design, FDA-approved manufacturing services for medical, commercial, computer, energy, and transportation markets with expertise in injection molding and fabrication |
536 | |||
| 23 |
Kito Crosbykitocrosby.com
Global leader in the lifting and securement industry, offering innovative products and solutions for demanding applications, with iconic brands and over 250 years of experience |
516 | |||
| 24 |
Safran Defense & Space, Inc.safran-dsi.com
Provides top-notch solutions for Defense and Space applications to meet the needs of U.S. customers. |
478 | |||
| 25 |
Office of Naval Researchnre.navy.mil
Leading provider of science and technology for the Department of the Navy, ensuring technological advantage for the Navy and Marine Corps worldwide |
472 | |||
| 26 |
Leidos Gibbs & Coxgibbscox.com
An engineering and design firm specializing in naval architecture, marine engineering, and consulting for government and commercial maritime programs |
396 | |||
| 27 |
Innovative Defense Technologies (IDT)idtus.com
Automated software testing, data analysis, and cybersecurity solutions for DOD's mission-critical systems, enabling faster, more affordable software capabilities deployment |
381 | |||
| 28 |
FCi Federalamentum.com
A company providing federal services has joined PAE, now connecting through LinkedIn at wwwlinkedincom/company/pae |
362 | |||
| 29 |
Salcomp Manufacturing USAsalcomp.com
Provides advanced power solutions and high-precision electronics manufacturing from its Arlington, Texas, facility. Supports global tech and energy companies, strengthening North American presence. |
355 | |||
| 30 |
Millenniummillgroupinc.com
A cybersecurity company with over 400 experts specializing in Red Team Operations, Defensive Cyber Operations, Software Engineering, and Technical Engineering |
346 | |||
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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 Nov 12, 2026.
More company lists in Arlington
- The largest companies in Arlington 367
- Multinational companies in Arlington 71
- Aerospace and defence companies in Arlington 46
- Consulting firms in Arlington 44
- Professional services firms in Arlington 44
- IT Services and IT Consulting companies in Arlington 41
- IT services companies in Arlington 33
- Non-profit Organizations companies in Arlington 32
- Manufacturers in Arlington 27
The same list elsewhere in United States
- Companies with in-house R&D in the United States 6,796
- Companies with in-house R&D in California 1,275
- Companies with in-house R&D in Texas 442
- Companies with in-house R&D in New York State 419
- Companies with in-house R&D in Massachusetts 396
- Companies with in-house R&D in Illinois 322
- Companies with in-house R&D in Michigan 287
- Companies with in-house R&D in Ohio 277
- Companies with in-house R&D in Pennsylvania 255
- Companies with in-house R&D in New Jersey 224
- Companies with in-house R&D in Florida 221
- Companies with in-house R&D in Alabama 215
- Companies with in-house R&D in Georgia 173
- Companies with in-house R&D in Virginia 166
- Companies with in-house R&D in North Carolina 158
- Companies with in-house R&D in Wisconsin 154
- Companies with in-house R&D in Minnesota 146
- Companies with in-house R&D in Washington State 140
- Companies with in-house R&D in Colorado 113
- Companies with in-house R&D in Maryland 107
- Companies with in-house R&D in Indiana 104
- Companies with in-house R&D in New York 223
- Companies with in-house R&D in San Francisco 147
- Companies with in-house R&D in Houston 129