# 30 leading companies with in-house R&D in Arlington

Tamtam tracks 39 companies with in-house R&D headquartered in Arlington. This list ranks the 30 largest by number of employees on LinkedIn, led by RTX, Boeing and Raytheon. Their median headcount is 768. Half of them were founded in 1969 or later.

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.

🇺🇸 Arlington · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [RTX](https://www.tamtam.ai/c/rtx) (rtx.com)<br>Aerospace and defense operations through three business units focused on solving complex problems within aviation, space systems, and military technology sectors worldwide. | Aviation and Aerospace Component Manufacturing | 🇺🇸 Arlington | 139,657 |  |
| 2 | [Boeing](https://www.tamtam.ai/c/boeing) (boeing.com)<br>A global aerospace leader providing commercial airplanes, defense, space systems, and services, focused on innovation, customer delivery, and employee growth | Aviation and Aerospace Component Manufacturing | 🇺🇸 Arlington | 129,130 | 1916 |
| 3 | [Raytheon](https://www.tamtam.ai/c/raytheon) (rtx.com)<br>Develops integrated air and missile defense, advanced sensors, space-based systems, hypersonics, and cyber solutions to provide next-generation protection and high-performance military effectors. | Defense and Space Manufacturing | 🇺🇸 Arlington | 48,589 | 1922 |
| 4 | [CoStar Group](https://www.tamtam.ai/c/costar-group) (costargroup.com)<br>A leading provider of online real estate marketplaces, information, and analytics for commercial and residential properties, with a global presence | Real Estate | 🇺🇸 Arlington | 11,725 | 1987 |
| 5 | [Accenture Federal Services](https://www.tamtam.ai/c/accenture-federal-services) (accenture.com)<br>The company brings advanced R&D, latest technologies, and human-centered design to the federal government to create lasting value and drive positive change | IT Services and IT Consulting | 🇺🇸 Arlington | 9,719 |  |
| 6 | [The University of Texas at Arlington](https://www.tamtam.ai/c/the-university-of-texas-at-arlington) (uta.edu)<br>A growing research powerhouse committed to discovery, innovative instruction, and community engagement, improving quality of life in Texas and beyond | Higher Education | 🇺🇸 Arlington | 9,020 | 1895 |
| 7 | [Leonardo DRS](https://www.tamtam.ai/c/leonardo-drs) (leonardodrs.com)<br>Providing advanced sensing, network computing, force protection, and electric power propulsion technologies to global national security customers through practical, high-performance defense innovation. | Defense and Space Manufacturing | 🇺🇸 Arlington | 6,551 | 1969 |
| 8 | [TSC](https://www.tamtam.ai/c/tsc-arlington) (tsc.com)<br>An employee-owned high-tech company providing engineering services and specialized products to US Government agencies and private industry, supporting system life cycle from concept development to operations | Defense and Space Manufacturing | 🇺🇸 Arlington | 2,526 | 1966 |
| 9 | [AV](https://www.tamtam.ai/c/av) (avinc.com)<br>Innovative solutions provider specializing in unmanned systems and high-altitude pseudo-satellites, empowering military and commercial customers with actionable intelligence for smarter decisions | Defense and Space Manufacturing | 🇺🇸 Arlington | 2,466 | 1971 |
| 10 | [Fluence](https://www.tamtam.ai/c/fluence) (fluenceenergy.com)<br>Global leader in energy storage products and services, providing modular solutions, comprehensive services, and AI-enabled software for managing renewable energy and storage | Renewable Energy Semiconductor Manufacturing | 🇺🇸 Arlington | 1,962 | 2018 |
| 11 | [Oil States Industries](https://www.tamtam.ai/c/oil-states-industries) (oilstates.com)<br>A technology company advancing the energy future with innovative equipment, systems, and services for energy, industrial, and military markets worldwide | Oil and Gas | 🇺🇸 Arlington | 1,356 | 1942 |
| 12 | [SET](https://www.tamtam.ai/c/set-arlington) (setcorp.com)<br>A small business founded by DARPA scientists in 2002, specializing in creating and commercializing innovative "smart" information technologies for defense and intelligence clients | IT Services and IT Consulting | 🇺🇸 Arlington | 1,240 | 2002 |
| 13 | [NRECA](https://www.tamtam.ai/c/nreca) (electric.coop)<br>Promotes, supports, and protects interests of electric cooperatives; advocates for safe, reliable, affordable electric service; researches new energy technologies; promotes global rural electrification. | Non-profit Organizations | 🇺🇸 Arlington | 1,085 | 1942 |
| 14 | [Defense Advanced Research Projects Agency (DARPA)](https://www.tamtam.ai/c/defense-advanced-research-projects-agency-darpa) (darpa.mil)<br>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. | Defense and Space Manufacturing | 🇺🇸 Arlington | 1,033 | 1958 |
| 15 | [Gerber](https://www.tamtam.ai/c/gerber) (nestlejobs.com)<br>A leader in early childhood nutrition, providing research-based products, nutrition education, and services for infants and toddlers Joined Nestlé in 2007 | Food and Beverage Retail | 🇺🇸 Arlington | 768 | 1927 |
| 16 | [Iscar Metals](https://www.tamtam.ai/c/iscar-metals) (iscarmetals.com)<br>Iscar Metals is a company that specializes in manufacturing metal cutting tools and providing innovative metalworking solutions to various industries | Industrial Machinery Manufacturing | 🇺🇸 Arlington | 703 | 1952 |
| 17 | [Tata Group - North America](https://www.tamtam.ai/c/tata-group-north-america) (tata.com)<br>Global business group with diverse operations including IT services, consulting, steel production, luxury hotels, automotive engineering, mining, consumer brands, and philanthropic activities | Mechanical Or Industrial Engineering | 🇺🇸 Arlington | 699 | 1868 |
| 18 | [Two Six Technologies](https://www.tamtam.ai/c/two-six-technologies) (twosixtech.com)<br>Innovative company specializing in cyber, information operations, data science, electronic systems, and more to solve complex global challenges for various government agencies | Software Development | 🇺🇸 Arlington | 670 | 2021 |
| 19 | [Core4ce](https://www.tamtam.ai/c/core4ce) (core4ce.com)<br>Mission-oriented company serving national security community by building, modernizing, and defending digital infrastructure with expertise in cyber operations, modernization, engineering, and analysis | IT Services and IT Consulting | 🇺🇸 Arlington | 599 | 2019 |
| 20 | [BlueHalo, an AV company](https://www.tamtam.ai/c/bluehalo-an-av-company) (bluehalo.com)<br>BlueHalo is a leading provider of cutting-edge defense solutions in Space, C-UAS, Autonomous Systems, Electronic Warfare & Cyber, and AI/ML | Defense and Space Manufacturing | 🇺🇸 Arlington | 575 | 2019 |
| 21 | [MicroPort Orthopedics](https://www.tamtam.ai/c/microport-orthopedics) (microportortho.com)<br>A global orthopedic company focused on improving patient outcomes, provider satisfaction, and advancing knee and hip implants through innovation and superior clinical results | Medical Equipment Manufacturing | 🇺🇸 Arlington | 549 | 2014 |
| 22 | [Mack Molding Company](https://www.tamtam.ai/c/mack-molding-company) (mack.com)<br>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 | Plastics Manufacturing | 🇺🇸 Arlington | 536 | 1920 |
| 23 | [Kito Crosby](https://www.tamtam.ai/c/kito-crosby) (kitocrosby.com)<br>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 | Manufacturing | 🇺🇸 Arlington | 516 |  |
| 24 | [Safran Defense & Space, Inc.](https://www.tamtam.ai/c/safran-defense-and-space-inc) (safran-dsi.com)<br>Provides top-notch solutions for Defense and Space applications to meet the needs of U.S. customers. | Aviation and Aerospace Component Manufacturing | 🇺🇸 Arlington | 478 |  |
| 25 | [Office of Naval Research](https://www.tamtam.ai/c/office-of-naval-research) (nre.navy.mil)<br>Leading provider of science and technology for the Department of the Navy, ensuring technological advantage for the Navy and Marine Corps worldwide | Armed Forces | 🇺🇸 Arlington | 472 | 1946 |
| 26 | [Leidos Gibbs & Cox](https://www.tamtam.ai/c/leidos-gibbs-and-cox) (gibbscox.com)<br>An engineering and design firm specializing in naval architecture, marine engineering, and consulting for government and commercial maritime programs | Maritime Transportation | 🇺🇸 Arlington | 396 | 1929 |
| 27 | [Innovative Defense Technologies (IDT)](https://www.tamtam.ai/c/innovative-defense-technologies-idt) (idtus.com)<br>Automated software testing, data analysis, and cybersecurity solutions for DOD's mission-critical systems, enabling faster, more affordable software capabilities deployment | IT Services and IT Consulting | 🇺🇸 Arlington | 381 | 2006 |
| 28 | [FCi Federal](https://www.tamtam.ai/c/fci-federal) (amentum.com)<br>A company providing federal services has joined PAE, now connecting through LinkedIn at wwwlinkedincom/company/pae | Government Administration | 🇺🇸 Arlington | 362 | 1991 |
| 29 | [Salcomp Manufacturing USA](https://www.tamtam.ai/c/salcomp-manufacturing-usa) (salcomp.com)<br>Provides advanced power solutions and high-precision electronics manufacturing from its Arlington, Texas, facility. Supports global tech and energy companies, strengthening North American presence. | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Arlington | 355 | 1973 |
| 30 | [Millennium](https://www.tamtam.ai/c/millennium-arlington) (millgroupinc.com)<br>A cybersecurity company with over 400 experts specializing in Red Team Operations, Defensive Cyber Operations, Software Engineering, and Technical Engineering | IT Services and IT Consulting | 🇺🇸 Arlington | 346 | 2004 |

## 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.

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- [Aerospace and defence companies in Arlington](https://www.tamtam.ai/l/aerospace-and-defense-companies-arlington) (46)
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- [Manufacturers in Arlington](https://www.tamtam.ai/l/manufacturers-arlington) (27)

## The same list elsewhere in United States

- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,275)
- [Companies with in-house R&D in Texas](https://www.tamtam.ai/l/r-and-d-companies-texas) (442)
- [Companies with in-house R&D in New York State](https://www.tamtam.ai/l/r-and-d-companies-new-york-state) (419)
- [Companies with in-house R&D in Massachusetts](https://www.tamtam.ai/l/r-and-d-companies-massachusetts) (396)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Companies with in-house R&D in Michigan](https://www.tamtam.ai/l/r-and-d-companies-michigan) (287)
- [Companies with in-house R&D in Ohio](https://www.tamtam.ai/l/r-and-d-companies-ohio) (277)
- [Companies with in-house R&D in Pennsylvania](https://www.tamtam.ai/l/r-and-d-companies-pennsylvania) (255)
- [Companies with in-house R&D in New Jersey](https://www.tamtam.ai/l/r-and-d-companies-new-jersey) (224)
- [Companies with in-house R&D in Florida](https://www.tamtam.ai/l/r-and-d-companies-florida) (221)
- [Companies with in-house R&D in Alabama](https://www.tamtam.ai/l/r-and-d-companies-alabama) (215)
- [Companies with in-house R&D in Georgia](https://www.tamtam.ai/l/r-and-d-companies-georgia) (173)
- [Companies with in-house R&D in Virginia](https://www.tamtam.ai/l/r-and-d-companies-virginia) (166)
- [Companies with in-house R&D in North Carolina](https://www.tamtam.ai/l/r-and-d-companies-north-carolina) (158)
- [Companies with in-house R&D in Wisconsin](https://www.tamtam.ai/l/r-and-d-companies-wisconsin) (154)
- [Companies with in-house R&D in Minnesota](https://www.tamtam.ai/l/r-and-d-companies-minnesota) (146)
- [Companies with in-house R&D in Washington State](https://www.tamtam.ai/l/r-and-d-companies-washington-state) (140)
- [Companies with in-house R&D in Colorado](https://www.tamtam.ai/l/r-and-d-companies-colorado) (113)
- [Companies with in-house R&D in Maryland](https://www.tamtam.ai/l/r-and-d-companies-maryland) (107)
- [Companies with in-house R&D in Indiana](https://www.tamtam.ai/l/r-and-d-companies-indiana) (104)
- [Companies with in-house R&D in New York](https://www.tamtam.ai/l/r-and-d-companies-new-york) (223)
- [Companies with in-house R&D in San Francisco](https://www.tamtam.ai/l/r-and-d-companies-san-francisco) (147)
- [Companies with in-house R&D in Houston](https://www.tamtam.ai/l/r-and-d-companies-houston) (129)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in North America](https://www.tamtam.ai/l/r-and-d-companies-in-north-america) (7,619)

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Source: https://www.tamtam.ai/l/r-and-d-companies-arlington