These Virginia-based companies primarily offer managed IT services and IT consulting, with a strong presence in the telecommunications sector. The list is dominated by large firms, many of which were founded in the 1990s and early 2000s, indicating a mature market. DXC Technology, with over 90,000 employees, assists global companies with IT modernization and security. Apex Systems specializes in strategy and managed services like application development and cybersecurity. GTT provides global managed network and security services, while QTS Data Centers offers secure infrastructure. Trianz delivers cloud adoption and AI transformation, and Transaction Network Services (TNS) provides Infrastructure-as-a-Service for various markets.
A clear pattern among these companies is their concentration in Northern Virginia, particularly in the cities of Herndon, McLean, and Reston. This geographic clustering suggests a regional hub for IT and telecommunications expertise. Many of these firms, such as ePlus inc. and DMI, focus on comprehensive IT solutions, including cloud services, cybersecurity, and data center management, often serving both public and private sector clients.
| # | 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 |
Apex Systemsapexsystems.com
Specializes in strategy, transformation, managed services including application development, data, cloud, cybersecurity, and AI solutions across global markets. |
13,945 | |||
| 3 | 3,917 | ||||
| 4 |
QTS Data Centersquantumfiber.com
Provider of data center solutions with over 9 million sq ft of space in North America Offers secure infrastructure, connectivity, and premium customer service |
2,591 | |||
| 5 |
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 | |||
| 6 |
Transaction Network Services (TNS)tnsi.com
A global provider of Infrastructure-as-a-Service solutions for financial, communications, and payments markets, supporting secure, flexible, and efficient interactions worldwide |
2,076 | |||
| 7 |
ePlus inc.eplus.com
Leading provider of comprehensive IT solutions, including security, cloud services, data migration, data center management, collaboration, and networking expertise, driven by innovation and customer-centric focus |
2,071 | |||
| 8 | 2,001 | ||||
| 9 |
Red Riverredriver.com
Provides technology integration services with expertise in security, networking, analytics, collaboration, mobility, and cloud solutions for businesses and government. |
1,527 | |||
| 10 |
22nd Century Technologies Inc.tscti.com
Providing managed IT services and solutions including digital transformation, cloud migration, cybersecurity, application modernization, and workforce support for government agencies. |
1,392 | |||
| 11 |
XO Communicationsverizon.com
Provides extensive IP and Ethernet network services including private data networking, cloud connectivity, unified communications, voice, internet access, and managed services. |
1,093 | |||
| 12 |
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 | |||
| 13 |
Iron Bow Technologiesironbow.com
We provide innovative IT solutions and services for government, commercial, and healthcare clients, focusing on collaboration, strategic insight, and continuous advancement in technology |
870 | |||
| 14 |
SAP NS2sapns2.com
The company offers cost-effective solutions with quick deployment times, robust support, and cleared personnel for mission-critical applications, leveraging industry-leading software tools and expertise |
791 | |||
| 15 |
AIS (Applied Information Sciences)ais.com
IT transformation firm specializing in compliant cloud and data solutions for large enterprises, governments, and defense agencies, driving innovation and modernization |
768 | |||
| 16 |
Ntiva, Inc.ntiva.com
A growing managed services company specializing in IT solutions, strategic direction, infrastructure management, and advanced security solutions for businesses nationwide |
608 | |||
| 17 |
CPGcpgbeyondthecloud.com
This company provides design, construction, and analytics-driven operations solutions for conventional, hyperscale, and edge data centers in North America |
602 | |||
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. | |||||
| 18 |
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 | |||
| 19 |
EdgeConneXedgeconnex.com
Global data center provider offering high-powered, purpose-built solutions for customers at any scale worldwide, including Edge, Far Edge, Hyperscale, and Edge Cable Landing Stations |
504 | |||
| 20 |
SMS Data Products Group, Inc.sms.com
Providing engineering, cybersecurity, and digital transformation solutions to modernize infrastructure, optimize operations, and support federal government missions with quality and integrity. |
455 | |||
| 21 |
NJVC-LLCchenegamios.com
Innovative IT services provider for government and commercial clients, offering solutions in enterprise services, cybersecurity, IT transformation, data analytics, and automation |
438 | |||
| 22 |
Virginia Information Technologies Agencyvita.virginia.gov
A technology partner for Virginia agencies, VITA connects, protects, and innovates IT services, infrastructure, and cybersecurity for state workers and residents |
409 | |||
| 23 |
Softility, Inc.softility.com
Softility leverages data and automation to solve IT, Network, Security, and Cloud Operations challenges for large organizations, driving efficiency and digital transformation through innovative solutions |
345 | |||
| 24 |
China Telecom Americasctamericas.com
Providing customized network and communication solutions for multinational customers, with a focus on the Americas and Asia, through a wide range of services |
323 | |||
| 25 |
mindSHIFT, a wholly owned subsidiary of Ricoh USA, Inc.mindSHIFT.com
A leading IT outsourcing and cloud services provider dedicated to delivering IT Peace of Mind for businesses of all sizes |
314 | |||
| 26 |
Lee Technologiesleetechnologies.com
A leading provider of comprehensive data center solutions, designing, building, operating, and maintaining critical facilities for top private and public sector organizations worldwide |
80 | |||
| 27 |
KAT ENTERPRISE LLCkatenterprise.com
A technology company providing high-value IT services with focus on innovation, custom programming, application development, digital transformation, and business process solutions |
57 | |||
| 28 |
Data Machinesdatamachines.com
A data analytics company specializing in cloud architectures, solving complex problems in data analytics, DevSecOps, machine intelligence, and data science |
45 | |||
| 29 |
Lore Systemslore.net
A provider of IT professional services including managed services, network engineering, hosting, cloud computing for government, commercial, association & nonprofit, and SMB clients |
39 | |||
| 30 |
SingleCommsinglecomm.com
Provider of omnichannel ACD, workforce management tools, and WebRTC platform for call centers, designed to enhance agent performance and customer service |
29 | |||
| 31 |
Richweb, Inc.richweb.com
A technology solutions company specializing in software development, mobile app development, website and database development, and network infrastructure services |
24 | |||
| 32 |
Advantage Proadvantagepro.us
A startup specializing in digital transformation, managed services, and consulting, striving to innovate and drive business growth |
23 | |||
| 33 | 20 | ||||
| 34 |
Qubrid AIplatform.qubrid.com
Provides enterprise-grade GPU infrastructure, low-latency API inference, and orchestration for open-weight AI models, focusing on AI engineering teams and SaaS enterprises. |
16 | |||
| 35 |
Advanced Network Solutions (ANS)ansnetworks.com
An IT Managed Services Provider based in Northern Virginia offering productivity-enabling IT services to small and medium-sized businesses through cloud services, consulting, and management solutions |
6 | |||
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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.
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The same list elsewhere in United States
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