These Virginia-based companies conduct in-house research and development. The list comprises mostly large corporations, primarily in defense and aerospace, but also includes financial services and food manufacturing. RTX, with over 139,000 employees, specializes in aerospace and defense, while Boeing develops commercial airplanes and defense systems. Northrop Grumman focuses on advanced technology solutions for global security, and Capital One is an innovative bank. Mars is a multinational conglomerate in food and beverage manufacturing, and Amentum provides engineering and project management.
A significant concentration of these large R&D companies is found in the Northern Virginia area, particularly in cities like Arlington, McLean, Falls Church, Reston, and Chantilly, indicating a regional hub for major corporate research and development activities.
| # | 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 |
Northrop Grummannorthropgrumman.com
Development of advanced technology solutions in autonomous systems, cyber, space, and defense to enhance global security and modernization. |
86,220 | |||
| 4 |
Capital Onecapitalone.com
Innovative bank focused on financial inclusion, creating tools to improve customers' lives, and encouraging a work-life balance for employees |
82,863 | |||
| 5 | 55,984 | ||||
| 6 |
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 | |||
| 7 | 48,589 | ||||
| 8 |
Booz Allen Hamiltonboozallen.com
Innovative technology consulting firm advancing critical missions through AI, cybersecurity, and engineering solutions, empowering clients to shape the future |
37,244 | |||
| 9 |
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 | |||
| 10 | 36,645 | ||||
| 11 |
CACI International Inccaci.com
providing advanced technology and expert services to address complex national security challenges for government and defense sectors |
22,223 | |||
| 12 |
Parsons Corporationparsons.com
A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach |
20,710 | |||
| 13 |
Peratonperaton.com
A company at the forefront of solving global challenges with innovative solutions, prioritizing safety and security through fresh perspectives and talent |
18,000 | |||
| 14 |
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 | |||
| 15 |
University of Virginiavirginia.edu
A renowned institution of higher learning, focused on meeting challenges, promoting access, and preparing citizen-leaders with empathy, integrity, and truth #GreatandGood |
16,633 | |||
| 16 |
Virginia Techvt.edu
Comprehensive university offering diverse degree programs, leading research initiatives, and driving technological innovation and economic growth regionally. |
15,504 | |||
| 17 |
Inova Healthelar.fa.us2.oraclecloud.com
Nonprofit healthcare provider in Northern Virginia delivering world-class clinical excellence across various specialties with compassion and individualized care |
14,520 | |||
| 18 |
Virginia Commonwealth Universityvcu.edu
Innovative university focused on excellence, diversity, and research Leading breakthrough work, student startups, and healthcare disparities Empowering graduates to make a global impact |
11,797 | |||
| 19 |
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 | |||
| 20 |
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 | |||
| 21 |
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 | |||
| 22 |
UVA Healthuvahealth.com
Academic medical center with hospital, trauma center, children's hospital, and clinics providing advanced healthcare and medical education. |
9,655 | |||
| 23 | 9,164 | ||||
| 24 | 7,949 | ||||
| 25 |
Old Dominion Universityodu.edu
Virginia's research university offers rigorous academics, residential community, innovative research, and a wide range of programs for student success and career development |
6,798 | |||
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. | |||||
| 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 |
The Aerospace Corporationaerospace.org
Providing objective technical expertise and leadership to solve complex space challenges, ensuring mission success for national security and commercial space programs. |
5,274 | |||
| 28 |
Defense Health Agencydha.mil
Providing healthcare services to millions globally, supporting hundreds of hospitals and clinics with dedicated military and civilian personnel. |
5,147 | |||
| 29 |
Deltekdeltek.com
Deltek provides project-based businesses with software solutions to enhance project success and financial management through superior intelligence and collaboration |
4,820 | |||
| 30 |
Volkswagen of America, Incvw.com
Research, development, manufacturing, sales, marketing, and service of passenger vehicles through a network of independent dealers in the U.S. |
4,326 | |||
| 31 |
Ellucianellucian.com
Leading provider of cloud & SaaS solutions for higher education institutions worldwide, enhancing operations and enriching the experience for millions of students |
4,315 | |||
| 32 |
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 | |||
| 33 |
Strategystrategy.com
First and largest Bitcoin treasury. Leading provider of universal semantic layer and AI+BI software. Unifies data and powers governed insights. |
3,470 | |||
| 34 |
Silgan Dispensingsilgandispensing.com
Global supplier of triggers, pumps, sprayers, and dispensing solutions for consumer goods in home, health, and beauty markets, offering innovative and customizable distribution solutions |
3,147 | |||
| 35 |
HITT Contracting Inc.hitt.com
A leading national construction company offering a wide range of services, delivering premium construction experiences with a focus on innovation and sustainability |
2,637 | |||
| 36 |
Appianappian.com
Delivers software platform helping organizations run processes to reduce costs, improve customer experiences, and gain strategic edges across many different global industries. |
2,632 | |||
| 37 | 2,526 | ||||
| 38 | 2,466 | ||||
| 39 |
Trianztrianz.com
Delivers cloud adoption and AI transformation through a unified platform for migration, modernization, multi-cloud management, FinOps, and autonomous federated AI data intelligence. |
2,369 | |||
| 40 |
Modern Technology Solutions, Inc. (MTSI)mtsi-va.com
Employee-owned engineering company providing technology solutions in areas such as missile defense, cyber security, intelligence, aviation, and homeland security |
2,308 | |||
| 41 |
DCS Corpdcscorp.com
Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. |
2,043 | |||
| 42 |
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 | |||
| 43 |
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 | |||
| 44 |
Carpenter Co.carpenter.com
Global manufacturer of polyurethane foams, chemicals, fibers, and insulation materials with a focus on innovation and enhancing quality of life |
1,879 | |||
| 45 |
NASA Langley Research Centernasa.gov
Pioneering aeronautics research center located in Hampton, Virginia, on the Chesapeake Bay, contributing to NASA's aerospace and science advancements |
1,714 | |||
| 46 |
Everbridgeeverbridge.com
Critical event management platform using purpose-built artificial intelligence and risk intelligence to accelerate response times and minimize disruptions for global organizational resilience. |
1,603 | |||
| 47 | 1,569 | ||||
| 48 |
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 | |||
| 49 |
ChemTreatchemtreat.com
A specialty chemical company dedicated to industrial water treatment, maximizing water power for various industries while helping customers save money and meet environmental goals |
1,533 | |||
| 50 |
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 | |||
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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 11, 2026.
More company lists in Virginia
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- IT Services and IT Consulting companies in Virginia 485
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- Multinational companies in Virginia 396
- Professional services firms in Virginia 344
- Consulting firms in Virginia 283
- Aerospace and defence companies in Virginia 247
- Education providers in Virginia 223
- Critical infrastructure operators in Virginia 131
- Public sector organisations in Virginia 131
- Retail chains in Virginia 128
- AI companies in Virginia 127
- Manufacturers in Virginia 125
- Defense and Space Manufacturing companies in Virginia 122
- Hospitals and Health Care companies in Virginia 122
- Healthcare providers in Virginia 121
- Software Development companies in Virginia 117
- Financial services firms in Virginia 116
- Subscription businesses in Virginia 114
- SaaS companies in Virginia 103
- Non-profit Organizations companies in Virginia 102
- Higher Education companies in Virginia 100
- Cybersecurity companies in Virginia 95
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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 1,276
- 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 214
- Companies with in-house R&D in Georgia 173
- 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
- Companies with in-house R&D in San Jose 103