The professional services firms in Virginia are largely major corporations, many of which specialize in IT services, defense, and engineering. DXC Technology, with over 90,000 employees, assists global companies with IT modernization and security, while Booz Allen Hamilton provides technology consulting with a focus on AI and cybersecurity. Leidos and SAIC are significant players in defense and space manufacturing, and Bechtel Corporation offers extensive engineering and construction services globally.
A notable pattern among these firms is their strong concentration in the northern Virginia area, particularly in McLean, Reston, and Chantilly. Many of these companies, such as Leidos, SAIC, and ICF, were founded around the same period, specifically in the late 1960s, indicating a shared era of establishment and growth.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
DXC Technologydxc.com
It assists global companies in managing critical systems, modernizing IT, optimizing data, and ensuring security across various cloud environments. |
90,597 | |||
| 2 |
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 | |||
| 3 |
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 | |||
| 4 | 36,645 | ||||
| 5 |
Bechtel Corporationbechtel.com
Engineering, construction, and project management services for energy, infrastructure, manufacturing, mining, and nuclear markets worldwide, delivering successful outcomes. |
33,626 | |||
| 6 |
Parsons Corporationparsons.com
A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach |
20,710 | |||
| 7 |
Guidehouseguidehouse.com
Global AI-led professional services firm providing advisory, technology, and managed services to commercial and government sectors for efficiency and resilience. |
15,865 | |||
| 8 |
Apex Systemsapexsystems.com
Specializes in strategy, transformation, managed services including application development, data, cloud, cybersecurity, and AI solutions across global markets. |
13,945 | |||
| 9 | 11,084 | ||||
| 10 | 10,724 | ||||
| 11 |
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 | |||
| 12 | 9,164 | ||||
| 13 |
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 | |||
| 14 |
LanceSoft, Inc.lancesoft.com
A certified MBE and woman-owned organization providing global workforce solutions and IT services to diverse clients across various domains with human touch |
4,954 | |||
| 15 |
PAEamentum.com
Global operational support provider with over 20,000 employees in 60 countries, delivering secure services for US government and allies since 1955 |
4,780 | |||
| 16 |
Dexiandexian.com
A leading provider of staffing, IT, and workforce solutions with a global presence, connecting talent, technology, and organizations for game-changing results |
4,431 | |||
| 17 |
ECSecstech.com
ECS provides advanced technology, science, and digital solutions to address cyber threats for customers in the public and private sectors |
3,996 | |||
| 18 |
M.C. Dean, Inc.mcdean.com
Designing, building, and maintaining cyber-physical solutions for critical facilities, secure environments, infrastructure, and enterprises; specializing in electrical, security, telecommunications, and control systems |
3,845 | |||
| 19 |
QBurstqburst.com
A full-service software solutions provider that helps clients enhance business effectiveness by leveraging digital technology |
3,383 | |||
| 20 |
GovCIOgovcio.com
Deliver IT solutions and services using Agile methods and innovation to optimize government operations and support citizen-focused missions. |
3,164 | |||
| 21 | 3,124 | ||||
| 22 |
Dewberrydewberry.com
A market-leading firm providing professional services to public and private sector clients, solving complex challenges, and transforming communities through innovation and expertise |
2,914 | |||
| 23 |
LCC - A Tech Mahindra Companylcc.com
A pioneer since 1983, providing network services globally for telecom operators with a focus on innovation, consultancy, and managed services |
2,770 | |||
| 24 |
10Pearls10pearls.com
A global leader in product innovation and software development, specializing in transforming businesses through digital technology with a focus on social impact |
2,760 | |||
| 25 | 2,744 | ||||
| 26 |
ECS Group of Companiesecslimited.com
A consulting engineering firm offering geotechnical, environmental, construction materials testing, and facilities engineering services through its employee-owned subsidiaries across the US |
2,665 | |||
| 27 | 2,526 | ||||
| 28 |
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 | |||
| 29 |
Systems Planning & Analysisspa.com
Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. |
2,242 | |||
| 30 |
Bowman Consultingbowman.com
A national engineering services provider delivering infrastructure solutions to customers in various regulated end markets, with expertise in planning, engineering, and environmental consulting |
2,221 | |||
| 31 |
AMERICAN SYSTEMSamericansystems.com
Employee-owned federal government contractor providing strategic solutions in IT, test & evaluation, mission support, engineering, and training for national priority programs |
2,212 | |||
| 32 |
CNA Corporationcna.org
A nonprofit research organization focused on national security, providing actionable solutions to complex problems through data analysis and field programs |
2,094 | |||
| 33 |
DCS Corpdcscorp.com
Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. |
2,043 | |||
| 34 |
American Institutes for Researchair.org
A nonprofit research institution providing evidence-based solutions for urgent challenges in education, health, workforce, human services, and international development worldwide |
2,010 | |||
| 35 |
Valiant Integrated Servicesonevaliant.com
Valiant supports critical missions worldwide by providing training, equipment, protection, and support for government agencies, peacekeepers, relief workers, and disaster response teams |
2,006 | |||
| 36 | 2,001 | ||||
| 37 |
CEB, now Gartnergartner.com
Providing research, advisory services, and technology solutions to help organizations make informed decisions and achieve their strategic priorities for future success |
1,934 | |||
| 38 |
UICGS / Bowhead Family of Companiesbowhead.com
A division of an Alaskan Native Corporation, offering premier support to defense and civilian government agencies through various services across the United States |
1,927 | |||
| 39 |
DT Globaldt-global.com
An international organization focused on sustainable development, innovation, and solving complex problems in peacebuilding, governance, economic development, environment, and human development sectors |
1,912 | |||
| 40 |
ECLAT Health Solutions Incevaire.com
A global healthcare support service providing medical coding and revenue cycle consulting to help providers reduce administrative burdens and improve reimbursement efficiency |
1,795 | |||
| 41 |
CrossCountry Consultingcrosscountry-consulting.com
Advisory and technology solutions for finance, accounting, risk, and operations, leveraging data and AI to address complex challenges and maximize transaction value. |
1,652 | |||
| 42 |
FSAfsafederal.com
Provider of administrative, legal, and investigative support services to US federal law enforcement and homeland security agencies Owned by SAIC and Amentum |
1,603 | |||
| 43 |
Apex Systems; formerly known as Lab Supportapexsystems.com
Leading staffing and services firm in North America, matching professionals with companies for contract, contract-to-hire, and direct hire opportunities across major industries |
1,590 | |||
| 44 |
Koniag Government Serviceskoniag-gs.com
A Native community-focused company delivering Enterprise Solutions, Professional Services, and Operational Management to Federal Government Agencies with a commitment to exceptional service delivery |
1,530 | |||
| 45 |
Red Riverredriver.com
Provides technology integration services with expertise in security, networking, analytics, collaboration, mobility, and cloud solutions for businesses and government. |
1,527 | |||
| 46 |
InfoCeptsinfocepts.ai
Infocepts specializes in using data, AI, and user-friendly analytics to help clients overcome challenges and make better business decisions |
1,428 | |||
| 47 |
Deloittedeloitte.com
A global professional services organization specializing in consulting, financial advisory, risk management, tax, and auditing services for clients in various industries |
1,383 | |||
| 48 |
GuidePoint Securityguidepointsecurity.com
Elite team of certified experts providing holistic cybersecurity solutions, guiding organizations to make informed decisions, choose appropriate products, and optimize resources |
1,364 | |||
| 49 |
Revaturerevature.com
Bridges the IT skills gap, accelerating technology workforces for organizations through talent programs, digital academies, and AI training, delivering productive talent faster. |
1,326 | |||
| 50 |
Noblisnoblis.org
A nonprofit organization providing scientific, technology, and strategy services to government and industry clients in national security, healthcare, and environmental sustainability |
1,313 | |||
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. | |||||
| 51 |
Tkxelcareers.tkxel.com
Tkxel is a USA-based software development company providing innovative solutions like AI, IoT, and cybersecurity to help businesses achieve their digital transformation goals globally |
1,264 | |||
| 52 |
Bohlerbohlerengineering.com
A land development consulting firm assisting real estate professionals in identifying opportunities, accelerating growth, and achieving successful projects in various markets |
1,261 | |||
| 53 |
DISYSdexian.com
Global technology and consulting specializing in managed services, staffing, and business consulting Experts in IT solutions and diverse staffing partnerships |
1,093 | |||
| 54 |
Timmons Grouptimmons.com
An engineering & technology firm offering civil, environmental, GIS, and surveying services to clients across the US for over 30 years |
1,086 | |||
| 55 |
Kearney & Companykearneyco.com
A leading CPA firm specializing in government financial management services to enhance operations, compliance, accountability, and prevent fraud |
1,061 | |||
| 56 |
CapTechcaptechconsulting.com
A technology consulting firm specializing in solving strategic problems and leveraging the latest innovations to drive organizational success Visit captechconsultingcom for more information |
1,038 | |||
| 57 |
Crestline Hotels & Resortscrestlinehotels.com
Hotel management company overseeing 129 properties with over 18,300 rooms nationwide, affiliated with renowned brands like Hilton, Marriott, and Hyatt |
1,030 | |||
| 58 |
MBO Partnersmbopartners.com
A direct sourcing platform connecting independent professionals and microbusiness owners with enterprise organizations, advancing the independent economy and changing the way of working |
997 | |||
| 59 |
Arcfieldarcfield.com
Provider of systems engineering and integration services to US Intelligence Community and Department of Defense, with expertise in advanced engineering, IT, and analysis |
949 | |||
| 60 |
memoryBluememoryblue.com
A leading Sales Development firm helping B2B Tech companies expand their pipeline and accelerate revenue growth globally with transparent, tangible results |
926 | |||
| 61 |
BrownGreer PLCbrowngreer.com
Specializing in multiple claims resolution and administration, we offer innovative legal solutions with a focus on organized data management and efficient case processing nationwide |
908 | |||
| 62 |
Idexcelidexcel.com
Provider of Professional Services and Technology Solutions specializing in Cloud, Data Platforms, Automation, and AI with global presence and customer-centric focus |
889 | |||
| 63 |
BARE Internationalbareinternational.com
Global leader in customer experience research, providing customized solutions and actionable feedback to businesses worldwide for over 35 years |
869 | |||
| 64 |
REI Systemsreisystems.com
Providing innovative technology solutions to federal, state, local, and nonprofit organizations for improved decision-making and streamlined processes. |
862 | |||
| 65 |
Riverside Researchriversideresearch.org
A nonprofit organization conducting independent research in various scientific fields to advance innovation and provide high-value solutions to government customers |
801 | |||
| 66 |
iPlaceiplaceusa.com
A global recruiting company with expertise in sourcing and managing recruiting teams for large corporations, staffing firms, and managed service providers worldwide |
785 | |||
| 67 |
CALIBRE Systems, Inc.calibresys.com
A management consulting and digital transformation company serving government and industry clients with enduring solutions for management, technology, and program challenges |
784 | |||
| 68 |
IonIdeaionidea.com
A technology and business process solutions company focused on delivering excellent products, innovative technologies, and high-quality services through passionate professionals and best practices |
783 | |||
| 69 |
Sev1Tech LLCsev1tech.com
A provider of innovative technology, high-end engineering, and mission solutions Offering expertise in various functional areas to help customers succeed beyond expectations |
778 | |||
| 70 |
Bureau Veritas Mission Criticalbvmissioncritical.com
A leading provider of mission critical commissioning and operational risk management services for data centers, ensuring quality, performance, and client satisfaction |
757 | |||
| 71 |
Harris Williamsharriswilliams.com
Global investment bank providing M&A and private capital advisory services, specializing in unlocking client value and delivering superior outcomes for over 30 years |
753 | |||
| 72 |
ENSCO, Inc.ensco.com
Provides leading-edge engineering, science, and advanced technology solutions to governments and private industries in aerospace, national security, and surface transportation sectors. |
745 | |||
| 73 |
Cynet Systemscynetsystems.com
A top talent supplier in the Washington DC Metro Area, specializing in staffing and recruiting for various industries across North America |
707 | |||
| 74 |
Management Systems Internationalmsiworldwide.com
An international development firm with a 30-year history, operating in challenging environments worldwide, employing 800 experts in public sector management and governance |
706 | |||
| 75 |
TSC Servicestscservicesllc.com
A rapidly growing provider of superior talent to top clients, offering contract recruiting, executive search, IT staffing, and serving various industries including government and aerospace |
704 | |||
| 76 |
Schnabel Engineeringschnabel-eng.com
Trusted partner in geotechnical, dam, and tunnel engineering projects worldwide Top design firm offering big-firm capabilities with small-firm responsiveness |
701 | |||
| 77 |
MSAmsaonline.com
A Small Business Enterprise in Virginia Beach providing innovative solutions in Environmental Sciences, Land Surveying, Civil and Environmental Engineering to diverse clientele |
696 | |||
| 78 |
The Cadmus Groupcadmusgroup.com
Global strategic consulting firm providing transformative digital solutions and expertise to help clients achieve goals and strengthen society and environment. |
691 | |||
| 79 |
Systems Engineering Services Corporation (SESC)sesc.com
Provider of technology solutions specializing in program management, application development, systems integration, mobile development, virtualization, and systems security for various industries |
681 | |||
| 80 |
Hunton & Williams LLPhunton.com
A legal firm created from the merger of Hunton & Williams LLP and Andrews Kurth Kenyon LLP, specializing in various legal services |
680 | |||
| 81 |
Acuity Internationalacuityinternational.com
Provider of critical services to global government and commercial enterprises, offering expertise in engineering, software solutions, medical care, cybersecurity, and more |
662 | |||
| 82 | 639 | ||||
| 83 | 633 | ||||
| 84 |
Lovelyticslovelytics.com
Data and analytics consultancy specializing in delivering services, building solutions, and promoting self-sufficiency through hands-on enablement for individuals, teams, and organizations |
626 | |||
| 85 |
Williams Mullenwilliamsmullen.com
Provides comprehensive legal services with regional expertise, delivering business solutions and responsive client-focused support across multiple states. |
614 | |||
| 86 |
CPGcpgbeyondthecloud.com
This company provides design, construction, and analytics-driven operations solutions for conventional, hyperscale, and edge data centers in North America |
602 | |||
| 87 |
ARES Corporationarescorporation.com
A leading engineering and project management company specializing in reliability, IT security, and software solutions for nuclear, clean technology, space, and defense industries |
596 | |||
| 88 |
Mythicsmythics.com
An award-winning Oracle systems integrator, consultant, and managed services provider offering a full range of Oracle products and solutions to various industries worldwide |
567 | |||
| 89 |
Brillient Corporationbrillient.net
An award-winning company specializing in full spectrum digital transformation, helping clients achieve efficiencies and lower costs through government and IT modernization initiatives |
556 | |||
| 90 |
Take2 Consulting, LLCtake2it.com
Connecting public and private sectors with specialized IT talent, providing fast, people-first staffing solutions for evolving technology needs. |
542 | |||
| 91 |
Markonmarkonsolutions.com
A national consulting firm specializing in enterprise technology, financial, program and construction management for federal government agencies, with an award-winning culture |
539 | |||
| 92 |
Valkyrie Enterprisesvalkyrie.com
A company founded in 2007, Valkyrie offers mission solutions, sustainment, and modernization to US Navy, DoD, and commercial clients worldwide Hiring skilled professionals |
536 | |||
| 93 |
Ampcus Incampcus.com
A global technology and business consulting firm specializing in Digital Transformation, Big Data, Analytics, Cyber Security, Testing, and Enterprise Solutions |
535 | |||
| 94 |
NeST Technologiesnesttech.com
A global technology services company offering custom software, hardware development, embedded systems, automation, consumer electronics, security solutions, and network management across various industries |
533 | |||
| 95 |
GSA Nationalgsanational.com
GSA National assists government contractors with compliance, cost efficiency, and employee benefit program administration, providing consulting, training, compliance analysis, and audit preparation services |
521 | |||
| 96 |
Xcelerate Solutionsxceleratesolutions.com
The company specializes in managing risk, creating innovative solutions, and accelerating time to value in the areas of enterprise security, consulting, and digital transformation |
508 | |||
| 97 |
Aleut Federalaleutfederal.com
A federal services company under The Aleut Corporation offering technology, environmental, construction, and infrastructure services through SBA-certified subsidiaries |
504 | |||
| 98 |
Piper Companiespipercompanies.com
An elite staffing firm specializing in IT, life sciences, and clinical solutions, delivering high quality talent, managed services, consulting, and program management innovations |
501 | |||
| 99 |
ITACitac.us.com
A design-build firm specializing in providing innovative engineering and construction solutions, focusing on project success, employee development, and community involvement |
495 | |||
| 100 |
Bart & Associates, Inc.bna-inc.com
A leading IT systems integrator offering modernization, integration, operations, human capital management solutions with expertise in CMMI, ISO, ITIL, and Agile best practices |
485 | |||
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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 11, 2026.
More company lists in Virginia
- The largest companies in Virginia 2,764
- IT Services and IT Consulting companies in Virginia 485
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- Multinational companies in Virginia 396
- Consulting firms in Virginia 283
- Aerospace and defence companies in Virginia 247
- Education providers in Virginia 223
- Companies with in-house R&D in Virginia 166
- 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
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- SaaS companies in Virginia 103
- Non-profit Organizations companies in Virginia 102
- Higher Education companies in Virginia 100
- Cybersecurity companies in Virginia 95
- Companies with a mobile app in Virginia 93
The same list elsewhere in United States
- Professional services firms in the United States 7,078
- Professional services firms in New York State 955
- Professional services firms in California 880
- Professional services firms in Texas 629
- Professional services firms in Florida 375
- Professional services firms in Illinois 339
- Professional services firms in Massachusetts 249
- Professional services firms in New Jersey 249
- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 172
- Professional services firms in Washington State 163
- Professional services firms in North Carolina 142
- Professional services firms in Alabama 135
- Professional services firms in Minnesota 125
- Professional services firms in New York 735
- Professional services firms in Chicago 196
- Professional services firms in Houston 156
- Professional services firms in Atlanta 143
- Professional services firms in San Francisco 130
- Professional services firms in Washington 109
- Professional services firms in Los Angeles 108