# List of professional services firms in Virginia

Tamtam tracks 344 professional services firms headquartered in Virginia. This list ranks the 100 largest by number of employees on LinkedIn, led by DXC Technology, Booz Allen Hamilton and Leidos. Their median headcount is 1,313. Half of them were founded in 1993 or later. The most common headquarters are McLean (16), Reston (14) and Arlington (11).

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.

🇺🇸 Virginia · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [DXC Technology](https://www.tamtam.ai/c/dxc-technology) (dxc.com)<br>It assists global companies in managing critical systems, modernizing IT, optimizing data, and ensuring security across various cloud environments. | IT Services and IT Consulting | 🇺🇸 Ashburn | 90,597 | 2017 |
| 2 | [Booz Allen Hamilton](https://www.tamtam.ai/c/booz-allen-hamilton) (boozallen.com)<br>Innovative technology consulting firm advancing critical missions through AI, cybersecurity, and engineering solutions, empowering clients to shape the future | Software Development | 🇺🇸 McLean | 37,244 | 1914 |
| 3 | [Leidos](https://www.tamtam.ai/c/leidos) (leidos.com)<br>Global technology leader providing digital mission innovations and efficient technical services for government and commercial customers through a diverse, flexible work environment. | Defense and Space Manufacturing | 🇺🇸 Reston | 37,171 | 1969 |
| 4 | [SAIC](https://www.tamtam.ai/c/saic) (bit.ly)<br>Advanced technology mission integrator delivering secure high-end solutions in mission IT, enterprise IT, engineering, and professional services for defense, space, and intelligence. | Defense and Space Manufacturing | 🇺🇸 Reston | 36,645 | 1969 |
| 5 | [Bechtel Corporation](https://www.tamtam.ai/c/bechtel-corporation) (bechtel.com)<br>Engineering, construction, and project management services for energy, infrastructure, manufacturing, mining, and nuclear markets worldwide, delivering successful outcomes. | Construction | 🇺🇸 Reston | 33,626 | 1898 |
| 6 | [Parsons Corporation](https://www.tamtam.ai/c/parsons-corporation) (parsons.com)<br>A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach | Civil Engineering | 🇺🇸 Chantilly | 20,710 |  |
| 7 | [Guidehouse](https://www.tamtam.ai/c/guidehouse) (guidehouse.com)<br>Global AI-led professional services firm providing advisory, technology, and managed services to commercial and government sectors for efficiency and resilience. | Business Consulting and Services | 🇺🇸 McLean | 15,865 |  |
| 8 | [Apex Systems](https://www.tamtam.ai/c/apex-systems) (apexsystems.com)<br>Specializes in strategy, transformation, managed services including application development, data, cloud, cybersecurity, and AI solutions across global markets. | IT Services and IT Consulting | 🇺🇸 Glen Allen | 13,945 | 1995 |
| 9 | [V2X Inc](https://www.tamtam.ai/c/v2x-inc) (gov2x.com)<br>Integrated solutions across operations, logistics, aerospace, training, and technology markets for national security and international clients throughout the entire mission lifecycle. | Defense and Space Manufacturing | 🇺🇸 McLean | 11,084 |  |
| 10 | [ICF](https://www.tamtam.ai/c/icf) (icf.com)<br>Global provider combining expertise and technology to solve complex challenges, support change management, and shape future strategies for clients. | Business Consulting and Services | 🇺🇸 Reston | 10,724 | 1969 |
| 11 | [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 |  |
| 12 | [MITRE](https://www.tamtam.ai/c/mitre) (mitre.org)<br>A non-profit corporation, operating federally funded R&D centers, dedicated to solving national challenges in defense, cybersecurity, healthcare, homeland security, and transportation | Research Services | 🇺🇸 McLean | 9,164 | 1958 |
| 13 | [The Aerospace Corporation](https://www.tamtam.ai/c/the-aerospace-corporation) (aerospace.org)<br>Providing objective technical expertise and leadership to solve complex space challenges, ensuring mission success for national security and commercial space programs. | Space Research and Technology | 🇺🇸 Chantilly | 5,274 | 1960 |
| 14 | [LanceSoft, Inc.](https://www.tamtam.ai/c/lancesoft-inc) (lancesoft.com)<br>A certified MBE and woman-owned organization providing global workforce solutions and IT services to diverse clients across various domains with human touch | IT Services and IT Consulting | 🇺🇸 Herndon | 4,954 | 2000 |
| 15 | [PAE](https://www.tamtam.ai/c/pae) (amentum.com)<br>Global operational support provider with over 20,000 employees in 60 countries, delivering secure services for US government and allies since 1955 | International Trade and Development | 🇺🇸 Falls Church | 4,780 | 1955 |
| 16 | [Dexian](https://www.tamtam.ai/c/dexian) (dexian.com)<br>A leading provider of staffing, IT, and workforce solutions with a global presence, connecting talent, technology, and organizations for game-changing results | IT Services and IT Consulting | 🇺🇸 McLean | 4,431 |  |
| 17 | [ECS](https://www.tamtam.ai/c/ecs-fairfax) (ecstech.com)<br>ECS provides advanced technology, science, and digital solutions to address cyber threats for customers in the public and private sectors | IT System Data Services | 🇺🇸 Fairfax | 3,996 | 1993 |
| 18 | [M.C. Dean, Inc.](https://www.tamtam.ai/c/m-c-dean-inc) (mcdean.com)<br>Designing, building, and maintaining cyber-physical solutions for critical facilities, secure environments, infrastructure, and enterprises; specializing in electrical, security, telecommunications, and control systems | Design Services | 🇺🇸 Tysons | 3,845 |  |
| 19 | [QBurst](https://www.tamtam.ai/c/qburst) (qburst.com)<br>A full-service software solutions provider that helps clients enhance business effectiveness by leveraging digital technology | IT Services and IT Consulting | 🇺🇸 Chantilly | 3,383 | 2004 |
| 20 | [GovCIO](https://www.tamtam.ai/c/govcio) (govcio.com)<br>Deliver IT solutions and services using Agile methods and innovation to optimize government operations and support citizen-focused missions. | IT System Data Services | 🇺🇸 Fairfax | 3,164 | 2010 |
| 21 | [SOSi](https://www.tamtam.ai/c/sosi) (sosi.com)<br>Delivering transformational technology and mission solutions for aerospace, defense, and government services clients while addressing modern challenges through trusted industry leadership. | Defense and Space Manufacturing | 🇺🇸 Reston | 3,124 | 1989 |
| 22 | [Dewberry](https://www.tamtam.ai/c/dewberry) (dewberry.com)<br>A market-leading firm providing professional services to public and private sector clients, solving complex challenges, and transforming communities through innovation and expertise | Engineering Services | 🇺🇸 Fairfax | 2,914 | 1956 |
| 23 | [LCC - A Tech Mahindra Company](https://www.tamtam.ai/c/lcc-a-tech-mahindra-company) (lcc.com)<br>A pioneer since 1983, providing network services globally for telecom operators with a focus on innovation, consultancy, and managed services | Telecommunications | 🇺🇸 McLean | 2,770 | 1983 |
| 24 | [10Pearls](https://www.tamtam.ai/c/10pearls) (10pearls.com)<br>A global leader in product innovation and software development, specializing in transforming businesses through digital technology with a focus on social impact | IT Services and IT Consulting | 🇺🇸 Vienna | 2,760 |  |
| 25 | [Akima](https://www.tamtam.ai/c/akima) (akima.com)<br>Global enterprise providing federal government solutions in facilities, logistics, IT, aerospace, security, engineering, and construction, while upholding Iñupiat values and prioritizing customer missions | Defense and Space Manufacturing | 🇺🇸 Herndon | 2,744 |  |
| 26 | [ECS Group of Companies](https://www.tamtam.ai/c/ecs-group-of-companies) (ecslimited.com)<br>A consulting engineering firm offering geotechnical, environmental, construction materials testing, and facilities engineering services through its employee-owned subsidiaries across the US | Civil Engineering | 🇺🇸 Chantilly | 2,665 |  |
| 27 | [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 |
| 28 | [Modern Technology Solutions, Inc. (MTSI)](https://www.tamtam.ai/c/modern-technology-solutions-inc-mtsi) (mtsi-va.com)<br>Employee-owned engineering company providing technology solutions in areas such as missile defense, cyber security, intelligence, aviation, and homeland security | Space Research and Technology | 🇺🇸 Alexandria | 2,308 | 1993 |
| 29 | [Systems Planning & Analysis](https://www.tamtam.ai/c/systems-planning-and-analysis) (spa.com)<br>Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. | Defense and Space Manufacturing | 🇺🇸 Alexandria | 2,242 |  |
| 30 | [Bowman Consulting](https://www.tamtam.ai/c/bowman-consulting) (bowman.com)<br>A national engineering services provider delivering infrastructure solutions to customers in various regulated end markets, with expertise in planning, engineering, and environmental consulting | Engineering Services | 🇺🇸 Reston | 2,221 | 1995 |
| 31 | [AMERICAN SYSTEMS](https://www.tamtam.ai/c/american-systems) (americansystems.com)<br>Employee-owned federal government contractor providing strategic solutions in IT, test & evaluation, mission support, engineering, and training for national priority programs | IT Services and IT Consulting | 🇺🇸 McLean | 2,212 | 1975 |
| 32 | [CNA Corporation](https://www.tamtam.ai/c/cna-corporation) (cna.org)<br>A nonprofit research organization focused on national security, providing actionable solutions to complex problems through data analysis and field programs | Research Services | 🇺🇸 Arlington | 2,094 | 1942 |
| 33 | [DCS Corp](https://www.tamtam.ai/c/dcs-corp) (dcscorp.com)<br>Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. | Defense and Space Manufacturing | 🇺🇸 Alexandria | 2,043 | 1977 |
| 34 | [American Institutes for Research](https://www.tamtam.ai/c/american-institutes-for-research) (air.org)<br>A nonprofit research institution providing evidence-based solutions for urgent challenges in education, health, workforce, human services, and international development worldwide | Research Services | 🇺🇸 Arlington | 2,010 | 1946 |
| 35 | [Valiant Integrated Services](https://www.tamtam.ai/c/valiant-integrated-services) (onevaliant.com)<br>Valiant supports critical missions worldwide by providing training, equipment, protection, and support for government agencies, peacekeepers, relief workers, and disaster response teams | Defense and Space Manufacturing | 🇺🇸 Herndon | 2,006 | 2017 |
| 36 | [DMI](https://www.tamtam.ai/c/dmi) (dminc.com)<br>provides digital services including cybersecurity, cloud, application development, and infrastructure support to public and private sector clients | IT Services and IT Consulting | 🇺🇸 McLean | 2,001 | 2002 |
| 37 | [CEB, now Gartner](https://www.tamtam.ai/c/ceb-now-gartner) (gartner.com)<br>Providing research, advisory services, and technology solutions to help organizations make informed decisions and achieve their strategic priorities for future success | IT Services and IT Consulting | 🇺🇸 Arlington | 1,934 | 1983 |
| 38 | [UICGS / Bowhead Family of Companies](https://www.tamtam.ai/c/uicgs-bowhead-family-of-companies) (bowhead.com)<br>A division of an Alaskan Native Corporation, offering premier support to defense and civilian government agencies through various services across the United States | Professional Services | 🇺🇸 Springfield | 1,927 | 1999 |
| 39 | [DT Global](https://www.tamtam.ai/c/dt-global) (dt-global.com)<br>An international organization focused on sustainable development, innovation, and solving complex problems in peacebuilding, governance, economic development, environment, and human development sectors | International Trade and Development | 🇺🇸 Arlington | 1,912 | 2019 |
| 40 | [ECLAT Health Solutions Inc](https://www.tamtam.ai/c/eclat-health-solutions-inc) (evaire.com)<br>A global healthcare support service providing medical coding and revenue cycle consulting to help providers reduce administrative burdens and improve reimbursement efficiency | Hospitals and Health Care | 🇺🇸 Herndon | 1,795 | 2008 |
| 41 | [CrossCountry Consulting](https://www.tamtam.ai/c/crosscountry-consulting) (crosscountry-consulting.com)<br>Advisory and technology solutions for finance, accounting, risk, and operations, leveraging data and AI to address complex challenges and maximize transaction value. | Business Consulting and Services | 🇺🇸 McLean | 1,652 | 2011 |
| 42 | [FSA](https://www.tamtam.ai/c/fsa) (fsafederal.com)<br>Provider of administrative, legal, and investigative support services to US federal law enforcement and homeland security agencies Owned by SAIC and Amentum | Government Administration | 🇺🇸 Herndon | 1,603 | 2003 |
| 43 | [Apex Systems; formerly known as Lab Support](https://www.tamtam.ai/c/apex-systems-formerly-known-as-lab-support) (apexsystems.com)<br>Leading staffing and services firm in North America, matching professionals with companies for contract, contract-to-hire, and direct hire opportunities across major industries | Staffing and Recruiting | 🇺🇸 Glen Allen | 1,590 | 1985 |
| 44 | [Koniag Government Services](https://www.tamtam.ai/c/koniag-government-services) (koniag-gs.com)<br>A Native community-focused company delivering Enterprise Solutions, Professional Services, and Operational Management to Federal Government Agencies with a commitment to exceptional service delivery | IT Services and IT Consulting | 🇺🇸 Chantilly | 1,530 | 1975 |
| 45 | [Red River](https://www.tamtam.ai/c/red-river) (redriver.com)<br>Provides technology integration services with expertise in security, networking, analytics, collaboration, mobility, and cloud solutions for businesses and government. | IT Services and IT Consulting | 🇺🇸 Chantilly | 1,527 | 1995 |
| 46 | [InfoCepts](https://www.tamtam.ai/c/infocepts) (infocepts.ai)<br>Infocepts specializes in using data, AI, and user-friendly analytics to help clients overcome challenges and make better business decisions | Business Consulting and Services | 🇺🇸 Washington | 1,428 | 2004 |
| 47 | [Deloitte](https://www.tamtam.ai/c/deloitte-arlington) (deloitte.com)<br>A global professional services organization specializing in consulting, financial advisory, risk management, tax, and auditing services for clients in various industries | Business Consulting and Services | 🇺🇸 Arlington | 1,383 |  |
| 48 | [GuidePoint Security](https://www.tamtam.ai/c/guidepoint-security) (guidepointsecurity.com)<br>Elite team of certified experts providing holistic cybersecurity solutions, guiding organizations to make informed decisions, choose appropriate products, and optimize resources | IT Services and IT Consulting | 🇺🇸 Reston | 1,364 | 2011 |
| 49 | [Revature](https://www.tamtam.ai/c/revature) (revature.com)<br>Bridges the IT skills gap, accelerating technology workforces for organizations through talent programs, digital academies, and AI training, delivering productive talent faster. | IT Services and IT Consulting | 🇺🇸 Reston | 1,326 | 2003 |
| 50 | [Noblis](https://www.tamtam.ai/c/noblis) (noblis.org)<br>A nonprofit organization providing scientific, technology, and strategy services to government and industry clients in national security, healthcare, and environmental sustainability | IT Services and IT Consulting | 🇺🇸 Reston | 1,313 | 1996 |
| 51 | [Tkxel](https://www.tamtam.ai/c/tkxel) (careers.tkxel.com)<br>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 | IT Services and IT Consulting | 🇺🇸 Reston | 1,264 | 2008 |
| 52 | [Bohler](https://www.tamtam.ai/c/bohler) (bohlerengineering.com)<br>A land development consulting firm assisting real estate professionals in identifying opportunities, accelerating growth, and achieving successful projects in various markets | Civil Engineering | 🇺🇸 Herndon | 1,261 | 1981 |
| 53 | [DISYS](https://www.tamtam.ai/c/disys) (dexian.com)<br>Global technology and consulting specializing in managed services, staffing, and business consulting Experts in IT solutions and diverse staffing partnerships | IT Services and IT Consulting | 🇺🇸 McLean | 1,093 |  |
| 54 | [Timmons Group](https://www.tamtam.ai/c/timmons-group) (timmons.com)<br>An engineering & technology firm offering civil, environmental, GIS, and surveying services to clients across the US for over 30 years | Civil Engineering | 🇺🇸 Richmond | 1,086 | 1953 |
| 55 | [Kearney & Company](https://www.tamtam.ai/c/kearney-and-company) (kearneyco.com)<br>A leading CPA firm specializing in government financial management services to enhance operations, compliance, accountability, and prevent fraud | Accounting | 🇺🇸 Alexandria | 1,061 | 1985 |
| 56 | [CapTech](https://www.tamtam.ai/c/captech) (captechconsulting.com)<br>A technology consulting firm specializing in solving strategic problems and leveraging the latest innovations to drive organizational success Visit captechconsultingcom for more information | IT Services and IT Consulting | 🇺🇸 Richmond | 1,038 |  |
| 57 | [Crestline Hotels & Resorts](https://www.tamtam.ai/c/crestline-hotels-and-resorts) (crestlinehotels.com)<br>Hotel management company overseeing 129 properties with over 18,300 rooms nationwide, affiliated with renowned brands like Hilton, Marriott, and Hyatt | Hospitality | 🇺🇸 Fairfax | 1,030 | 2000 |
| 58 | [MBO Partners](https://www.tamtam.ai/c/mbo-partners) (mbopartners.com)<br>A direct sourcing platform connecting independent professionals and microbusiness owners with enterprise organizations, advancing the independent economy and changing the way of working | Business Consulting and Services | 🇺🇸 Ashburn | 997 | 1996 |
| 59 | [Arcfield](https://www.tamtam.ai/c/arcfield) (arcfield.com)<br>Provider of systems engineering and integration services to US Intelligence Community and Department of Defense, with expertise in advanced engineering, IT, and analysis | Engineering Services | 🇺🇸 Chantilly | 949 | 2021 |
| 60 | [memoryBlue](https://www.tamtam.ai/c/memoryblue) (memoryblue.com)<br>A leading Sales Development firm helping B2B Tech companies expand their pipeline and accelerate revenue growth globally with transparent, tangible results | Business Consulting and Services | 🇺🇸 Tysons | 926 | 2002 |
| 61 | [BrownGreer PLC](https://www.tamtam.ai/c/browngreer-plc) (browngreer.com)<br>Specializing in multiple claims resolution and administration, we offer innovative legal solutions with a focus on organized data management and efficient case processing nationwide | Law Practice | 🇺🇸 Richmond | 908 | 2002 |
| 62 | [Idexcel](https://www.tamtam.ai/c/idexcel) (idexcel.com)<br>Provider of Professional Services and Technology Solutions specializing in Cloud, Data Platforms, Automation, and AI with global presence and customer-centric focus | IT Services and IT Consulting | 🇺🇸 Herndon | 889 | 1998 |
| 63 | [BARE International](https://www.tamtam.ai/c/bare-international) (bareinternational.com)<br>Global leader in customer experience research, providing customized solutions and actionable feedback to businesses worldwide for over 35 years | Market Research | 🇺🇸 Fairfax | 869 | 1987 |
| 64 | [REI Systems](https://www.tamtam.ai/c/rei-systems) (reisystems.com)<br>Providing innovative technology solutions to federal, state, local, and nonprofit organizations for improved decision-making and streamlined processes. | IT Services and IT Consulting | 🇺🇸 Sterling | 862 | 1989 |
| 65 | [Riverside Research](https://www.tamtam.ai/c/riverside-research) (riversideresearch.org)<br>A nonprofit organization conducting independent research in various scientific fields to advance innovation and provide high-value solutions to government customers | Research Services | 🇺🇸 Fairfax | 801 | 1967 |
| 66 | [iPlace](https://www.tamtam.ai/c/iplace) (iplaceusa.com)<br>A global recruiting company with expertise in sourcing and managing recruiting teams for large corporations, staffing firms, and managed service providers worldwide | Staffing and Recruiting | 🇺🇸 McLean | 785 | 2006 |
| 67 | [CALIBRE Systems, Inc.](https://www.tamtam.ai/c/calibre-systems-inc) (calibresys.com)<br>A management consulting and digital transformation company serving government and industry clients with enduring solutions for management, technology, and program challenges | Business Consulting and Services | 🇺🇸 Alexandria | 784 | 1989 |
| 68 | [IonIdea](https://www.tamtam.ai/c/ionidea) (ionidea.com)<br>A technology and business process solutions company focused on delivering excellent products, innovative technologies, and high-quality services through passionate professionals and best practices | IT Services and IT Consulting | 🇺🇸 Fairfax | 783 | 1991 |
| 69 | [Sev1Tech LLC](https://www.tamtam.ai/c/sev1tech-llc) (sev1tech.com)<br>A provider of innovative technology, high-end engineering, and mission solutions Offering expertise in various functional areas to help customers succeed beyond expectations | IT Services and IT Consulting | 🇺🇸 Woodbridge | 778 | 2010 |
| 70 | [Bureau Veritas Mission Critical](https://www.tamtam.ai/c/bureau-veritas-mission-critical) (bvmissioncritical.com)<br>A leading provider of mission critical commissioning and operational risk management services for data centers, ensuring quality, performance, and client satisfaction | Construction | 🇺🇸 McLean | 757 | 2004 |
| 71 | [Harris Williams](https://www.tamtam.ai/c/harris-williams) (harriswilliams.com)<br>Global investment bank providing M&A and private capital advisory services, specializing in unlocking client value and delivering superior outcomes for over 30 years | Investment Banking | 🇺🇸 Richmond | 753 | 1991 |
| 72 | [ENSCO, Inc.](https://www.tamtam.ai/c/ensco-inc) (ensco.com)<br>Provides leading-edge engineering, science, and advanced technology solutions to governments and private industries in aerospace, national security, and surface transportation sectors. | Engineering Services | 🇺🇸 Vienna | 745 | 1969 |
| 73 | [Cynet Systems](https://www.tamtam.ai/c/cynet-systems) (cynetsystems.com)<br>A top talent supplier in the Washington DC Metro Area, specializing in staffing and recruiting for various industries across North America | IT Services and IT Consulting | 🇺🇸 Sterling | 707 |  |
| 74 | [Management Systems International](https://www.tamtam.ai/c/management-systems-international) (msiworldwide.com)<br>An international development firm with a 30-year history, operating in challenging environments worldwide, employing 800 experts in public sector management and governance | International Trade and Development | 🇺🇸 Arlington | 706 | 1981 |
| 75 | [TSC Services](https://www.tamtam.ai/c/tsc-services) (tscservicesllc.com)<br>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 | Staffing and Recruiting | 🇺🇸 Vienna | 704 |  |
| 76 | [Schnabel Engineering](https://www.tamtam.ai/c/schnabel-engineering) (schnabel-eng.com)<br>Trusted partner in geotechnical, dam, and tunnel engineering projects worldwide Top design firm offering big-firm capabilities with small-firm responsiveness | Civil Engineering | 🇺🇸 Glen Allen | 701 | 1956 |
| 77 | [MSA](https://www.tamtam.ai/c/msa) (msaonline.com)<br>A Small Business Enterprise in Virginia Beach providing innovative solutions in Environmental Sciences, Land Surveying, Civil and Environmental Engineering to diverse clientele | Civil Engineering | 🇺🇸 Virginia Beach | 696 | 1973 |
| 78 | [The Cadmus Group](https://www.tamtam.ai/c/the-cadmus-group) (cadmusgroup.com)<br>Global strategic consulting firm providing transformative digital solutions and expertise to help clients achieve goals and strengthen society and environment. | Business Consulting and Services | 🇺🇸 Arlington | 691 |  |
| 79 | [Systems Engineering Services Corporation (SESC)](https://www.tamtam.ai/c/systems-engineering-services-corporation-sesc) (sesc.com)<br>Provider of technology solutions specializing in program management, application development, systems integration, mobile development, virtualization, and systems security for various industries | IT Services and IT Consulting | 🇺🇸 Reston | 681 | 1989 |
| 80 | [Hunton & Williams LLP](https://www.tamtam.ai/c/hunton-and-williams-llp) (hunton.com)<br>A legal firm created from the merger of Hunton & Williams LLP and Andrews Kurth Kenyon LLP, specializing in various legal services | Law Practice | 🇺🇸 Richmond | 680 |  |
| 81 | [Acuity International](https://www.tamtam.ai/c/acuity-international) (acuityinternational.com)<br>Provider of critical services to global government and commercial enterprises, offering expertise in engineering, software solutions, medical care, cybersecurity, and more | Professional Services | 🇺🇸 Reston | 662 |  |
| 82 | [LinQuest](https://www.tamtam.ai/c/linquest) (kbr.com)<br>Delivering performance excellence in Air, Land, Sea, Space, and Cyberspace domains through innovative, cost-effective solutions for government, civil, and commercial customers | Defense and Space Manufacturing | 🇺🇸 Herndon | 639 | 2004 |
| 83 | [ANSER](https://www.tamtam.ai/c/anser) (anser.org)<br>A public service research institute providing objective analysis in national security, homeland security, and public policy, specializing in technology development collaborations | Business Consulting and Services | 🇺🇸 Arlington | 633 | 1958 |
| 84 | [Lovelytics](https://www.tamtam.ai/c/lovelytics) (lovelytics.com)<br>Data and analytics consultancy specializing in delivering services, building solutions, and promoting self-sufficiency through hands-on enablement for individuals, teams, and organizations | Business Consulting and Services | 🇺🇸 Arlington | 626 | 2017 |
| 85 | [Williams Mullen](https://www.tamtam.ai/c/williams-mullen) (williamsmullen.com)<br>Provides comprehensive legal services with regional expertise, delivering business solutions and responsive client-focused support across multiple states. | Law Practice | 🇺🇸 Richmond | 614 | 1909 |
| 86 | [CPG](https://www.tamtam.ai/c/cpg) (cpgbeyondthecloud.com)<br>This company provides design, construction, and analytics-driven operations solutions for conventional, hyperscale, and edge data centers in North America | IT Services and IT Consulting | 🇺🇸 Ashburn | 602 | 2000 |
| 87 | [ARES Corporation](https://www.tamtam.ai/c/ares-corporation) (arescorporation.com)<br>A leading engineering and project management company specializing in reliability, IT security, and software solutions for nuclear, clean technology, space, and defense industries | Defense and Space Manufacturing | 🇺🇸 McLean | 596 | 1992 |
| 88 | [Mythics](https://www.tamtam.ai/c/mythics) (mythics.com)<br>An award-winning Oracle systems integrator, consultant, and managed services provider offering a full range of Oracle products and solutions to various industries worldwide | IT Services and IT Consulting | 🇺🇸 Virginia Beach | 567 | 2000 |
| 89 | [Brillient Corporation](https://www.tamtam.ai/c/brillient-corporation) (brillient.net)<br>An award-winning company specializing in full spectrum digital transformation, helping clients achieve efficiencies and lower costs through government and IT modernization initiatives | IT Services and IT Consulting | 🇺🇸 Reston | 556 | 2006 |
| 90 | [Take2 Consulting, LLC](https://www.tamtam.ai/c/take2-consulting-llc) (take2it.com)<br>Connecting public and private sectors with specialized IT talent, providing fast, people-first staffing solutions for evolving technology needs. | Staffing and Recruiting | 🇺🇸 Vienna | 542 | 2015 |
| 91 | [Markon](https://www.tamtam.ai/c/markon) (markonsolutions.com)<br>A national consulting firm specializing in enterprise technology, financial, program and construction management for federal government agencies, with an award-winning culture | Professional Services | 🇺🇸 Falls Church | 539 |  |
| 92 | [Valkyrie Enterprises](https://www.tamtam.ai/c/valkyrie-enterprises) (valkyrie.com)<br>A company founded in 2007, Valkyrie offers mission solutions, sustainment, and modernization to US Navy, DoD, and commercial clients worldwide Hiring skilled professionals | Defense and Space Manufacturing | 🇺🇸 Virginia Beach | 536 | 2007 |
| 93 | [Ampcus Inc](https://www.tamtam.ai/c/ampcus-inc) (ampcus.com)<br>A global technology and business consulting firm specializing in Digital Transformation, Big Data, Analytics, Cyber Security, Testing, and Enterprise Solutions | IT Services and IT Consulting | 🇺🇸 Chantilly | 535 | 2004 |
| 94 | [NeST Technologies](https://www.tamtam.ai/c/nest-technologies) (nesttech.com)<br>A global technology services company offering custom software, hardware development, embedded systems, automation, consumer electronics, security solutions, and network management across various industries | Software Development | 🇺🇸 Sterling | 533 | 1998 |
| 95 | [GSA National](https://www.tamtam.ai/c/gsa-national) (gsanational.com)<br>GSA National assists government contractors with compliance, cost efficiency, and employee benefit program administration, providing consulting, training, compliance analysis, and audit preparation services | Insurance and Employee Benefit Funds | 🇺🇸 Fairfax | 521 | 1991 |
| 96 | [Xcelerate Solutions](https://www.tamtam.ai/c/xcelerate-solutions) (xceleratesolutions.com)<br>The company specializes in managing risk, creating innovative solutions, and accelerating time to value in the areas of enterprise security, consulting, and digital transformation | IT Services and IT Consulting | 🇺🇸 McLean | 508 | 2009 |
| 97 | [Aleut Federal](https://www.tamtam.ai/c/aleut-federal) (aleutfederal.com)<br>A federal services company under The Aleut Corporation offering technology, environmental, construction, and infrastructure services through SBA-certified subsidiaries | Professional Services | 🇺🇸 Reston | 504 |  |
| 98 | [Piper Companies](https://www.tamtam.ai/c/piper-companies) (pipercompanies.com)<br>An elite staffing firm specializing in IT, life sciences, and clinical solutions, delivering high quality talent, managed services, consulting, and program management innovations | Business Consulting and Services | 🇺🇸 McLean | 501 | 2011 |
| 99 | [ITAC](https://www.tamtam.ai/c/itac-chester) (itac.us.com)<br>A design-build firm specializing in providing innovative engineering and construction solutions, focusing on project success, employee development, and community involvement | Construction | 🇺🇸 Chester | 495 | 1988 |
| 100 | [Bart & Associates, Inc.](https://www.tamtam.ai/c/bart-and-associates-inc) (bna-inc.com)<br>A leading IT systems integrator offering modernization, integration, operations, human capital management solutions with expertise in CMMI, ISO, ITIL, and Agile best practices | IT Services and IT Consulting | 🇺🇸 McLean | 485 | 1988 |

## 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

- [The largest companies in Virginia](https://www.tamtam.ai/l/largest-companies-virginia) (2,764)
- [IT Services and IT Consulting companies in Virginia](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-virginia) (485)
- [IT services companies in Virginia](https://www.tamtam.ai/l/it-services-companies-virginia) (455)
- [Multinational companies in Virginia](https://www.tamtam.ai/l/multinational-companies-virginia) (396)
- [Consulting firms in Virginia](https://www.tamtam.ai/l/consulting-firms-virginia) (283)
- [Aerospace and defence companies in Virginia](https://www.tamtam.ai/l/aerospace-and-defense-companies-virginia) (247)
- [Education providers in Virginia](https://www.tamtam.ai/l/education-companies-virginia) (223)
- [Companies with in-house R&D in Virginia](https://www.tamtam.ai/l/r-and-d-companies-virginia) (166)
- [Critical infrastructure operators in Virginia](https://www.tamtam.ai/l/critical-infrastructure-operators-virginia) (131)
- [Public sector organisations in Virginia](https://www.tamtam.ai/l/public-sector-organisations-virginia) (131)
- [Retail chains in Virginia](https://www.tamtam.ai/l/retail-chains-virginia) (128)
- [AI companies in Virginia](https://www.tamtam.ai/l/ai-companies-virginia) (127)
- [Manufacturers in Virginia](https://www.tamtam.ai/l/manufacturers-virginia) (125)
- [Defense and Space Manufacturing companies in Virginia](https://www.tamtam.ai/l/defense-and-space-manufacturing-companies-virginia) (122)
- [Hospitals and Health Care companies in Virginia](https://www.tamtam.ai/l/hospitals-and-health-care-companies-virginia) (122)
- [Healthcare providers in Virginia](https://www.tamtam.ai/l/healthcare-providers-virginia) (121)
- [Software Development companies in Virginia](https://www.tamtam.ai/l/software-development-companies-virginia) (117)
- [Financial services firms in Virginia](https://www.tamtam.ai/l/financial-services-firms-virginia) (116)
- [Subscription businesses in Virginia](https://www.tamtam.ai/l/subscription-businesses-virginia) (114)
- [SaaS companies in Virginia](https://www.tamtam.ai/l/saas-companies-virginia) (103)
- [Non-profit Organizations companies in Virginia](https://www.tamtam.ai/l/non-profit-organizations-companies-virginia) (102)
- [Higher Education companies in Virginia](https://www.tamtam.ai/l/higher-education-companies-virginia) (100)
- [Cybersecurity companies in Virginia](https://www.tamtam.ai/l/cybersecurity-companies-virginia) (95)
- [Companies with a mobile app in Virginia](https://www.tamtam.ai/l/companies-with-mobile-app-virginia) (93)

## The same list elsewhere in United States

- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,078)
- [Professional services firms in New York State](https://www.tamtam.ai/l/professional-services-firms-new-york-state) (955)
- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Professional services firms in Texas](https://www.tamtam.ai/l/professional-services-firms-texas) (629)
- [Professional services firms in Florida](https://www.tamtam.ai/l/professional-services-firms-florida) (375)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Professional services firms in Massachusetts](https://www.tamtam.ai/l/professional-services-firms-massachusetts) (249)
- [Professional services firms in New Jersey](https://www.tamtam.ai/l/professional-services-firms-new-jersey) (249)
- [Professional services firms in Georgia](https://www.tamtam.ai/l/professional-services-firms-georgia) (246)
- [Professional services firms in Pennsylvania](https://www.tamtam.ai/l/professional-services-firms-pennsylvania) (245)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Professional services firms in Maryland](https://www.tamtam.ai/l/professional-services-firms-maryland) (176)
- [Professional services firms in Michigan](https://www.tamtam.ai/l/professional-services-firms-michigan) (172)
- [Professional services firms in Washington State](https://www.tamtam.ai/l/professional-services-firms-washington-state) (163)
- [Professional services firms in North Carolina](https://www.tamtam.ai/l/professional-services-firms-north-carolina) (142)
- [Professional services firms in Alabama](https://www.tamtam.ai/l/professional-services-firms-alabama) (135)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (125)
- [Professional services firms in New York](https://www.tamtam.ai/l/professional-services-firms-new-york) (735)
- [Professional services firms in Chicago](https://www.tamtam.ai/l/professional-services-firms-chicago) (196)
- [Professional services firms in Houston](https://www.tamtam.ai/l/professional-services-firms-houston) (156)
- [Professional services firms in Atlanta](https://www.tamtam.ai/l/professional-services-firms-atlanta) (143)
- [Professional services firms in San Francisco](https://www.tamtam.ai/l/professional-services-firms-san-francisco) (130)
- [Professional services firms in Washington](https://www.tamtam.ai/l/professional-services-firms-washington) (109)
- [Professional services firms in Los Angeles](https://www.tamtam.ai/l/professional-services-firms-los-angeles) (108)

---

Source: https://www.tamtam.ai/l/professional-services-firms-virginia