| # | 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 |
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 |
| 3 |
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 |
| 4 |
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 |
| 5 | 36,645 | |
| 6 |
Maximusmaximus.com
The company provides transformative technology services, digital customer experiences, and clinical health services to improve lives and support customer missions |
26,654 |
| 7 |
General Dynamics Information Technologygdit.com
Provides technology and professional services to U.S. government agencies, specializing in digital modernization, AI, cloud, cyber, and application development worldwide. |
26,598 |
| 8 |
CACI International Inccaci.com
providing advanced technology and expert services to address complex national security challenges for government and defense sectors |
22,223 |
| 9 |
Parsons Corporationparsons.com
A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach |
20,710 |
| 10 |
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 |
| 11 |
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 |
| 12 |
Apex Systemsapexsystems.com
Specializes in strategy, transformation, managed services including application development, data, cloud, cybersecurity, and AI solutions across global markets. |
13,945 |
| 13 | 11,084 | |
| 14 | 10,724 | |
| 15 |
MANTECHmantech.com
A dedicated company providing technology services to support national security, military welfare, community protection, and healthcare advancement for over 50 years |
10,459 |
| 16 |
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 |
| 17 |
Aptaraaptaracorp.com
Transforms content for digital and corporate learning audiences, accelerating information providers' transition from print to digital with production, design, and new media enhancements. |
5,633 |
| 18 |
ASRC Federalasrcfederal.com
Providing technology and expertise to federal defense and civilian agencies, supporting missions from space exploration to cybersecurity and infrastructure. |
5,051 |
| 19 |
Mission Technologies, a division of HIIhii.com
The company's Mission Technologies division develops integrated solutions for military operations, including C5ISR, AI, cyberspace strategies, unmanned systems, and platform modernization |
5,049 |
| 20 |
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 |
| 21 |
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 |
| 22 |
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 |
| 23 |
ECSecstech.com
ECS provides advanced technology, science, and digital solutions to address cyber threats for customers in the public and private sectors |
3,996 |
| 24 |
QBurstqburst.com
A full-service software solutions provider that helps clients enhance business effectiveness by leveraging digital technology |
3,383 |
| 25 |
GovCIOgovcio.com
Deliver IT solutions and services using Agile methods and innovation to optimize government operations and support citizen-focused missions. |
3,164 |
| 26 | 3,124 | |
| 27 |
LMIlmisolutions.com
A consultancy leveraging federal expertise and innovation to drive mission success, inspire creativity, and accelerate progress for evolving mission needs |
3,040 |
| 28 |
Perspectaperaton.com
Innovative provider of diverse capabilities in defense, intelligence, healthcare, and more, supporting US government missions with patented solutions and digital transformation services |
2,820 |
| 29 |
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 |
| 30 |
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 |
| 31 | 2,744 | |
| 32 |
SRA, a CSRA company
A provider of information technology services that acquired CSRA Inc in 2018 and completed a combination with SRA International in 2015 |
2,492 |
| 33 |
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 |
| 34 |
Systems Planning & Analysisspa.com
Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. |
2,242 |
| 35 |
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 |
| 36 |
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 |
| 37 | 2,001 | |
| 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 |
General Dynamics Advanced Information Systemsgd-ais.com
An advanced information systems provider offering mission solutions for defense, intelligence, space, and homeland security, integrating land, air, sea, space, and cyber assets |
1,840 |
| 40 |
3Pillar3pillarglobal.com
Innovative product development partner driving rapid revenue and growth for industry leaders through lean, agile digital solutions across various technologies |
1,709 |
| 41 |
ASM Researchasmr.com
A provider of technology solutions for the Federal government with expertise in IT, program management, security, healthcare, education, and training |
1,678 |
| 42 |
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 |
| 43 |
Agile Defenseagiledefense.com
Innovating IT solutions for US government agencies, transforming operations through a philosophy of listening, thinking, and innovation |
1,572 |
| 44 | 1,569 | |
| 45 |
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 |
| 46 |
Red Riverredriver.com
Provides technology integration services with expertise in security, networking, analytics, collaboration, mobility, and cloud solutions for businesses and government. |
1,527 |
| 47 |
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 |
| 48 |
InfoCeptsinfocepts.ai
Infocepts specializes in using data, AI, and user-friendly analytics to help clients overcome challenges and make better business decisions |
1,428 |
| 49 |
Engility Corporationsaic.com
A premier technology integrator based in Reston, Virginia, providing information about SAIC through their linkedin page |
1,414 |
| 50 |
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 |
| 51 |
VT Group (VTG)vtgdefense.com
VTG is a company based in Chantilly, Virginia that specializes in delivering force modernization and digital transformation solutions for various defense sectors |
1,368 |
| 52 |
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 |
| 53 |
Credencecredence.ai
A leading government contractor providing technology, health, development, engineering, and management solutions with a focus on exceeding customer expectations and employee wellbeing |
1,345 |
| 54 |
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 |
| 55 |
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 |
| 56 |
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 |
| 57 |
DISYSdexian.com
Global technology and consulting specializing in managed services, staffing, and business consulting Experts in IT solutions and diverse staffing partnerships |
1,093 |
| 58 |
BOSH Global Servicesmagaero.com
Specializing in supporting unmanned systems, first responder communications, video technology, and ISR systems with operations, training, data analysis, and network support |
1,070 |
| 59 |
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 |
| 60 |
ISCIteamisci.com
A trusted provider of information solutions, professional services, and cybersecurity for government organizations, delivering excellence through expertise and dedication |
988 |
| 61 | 983 | |
| 62 |
Tyto Athene, LLCgotyto.com
Specializing in mission-focused digital transformation, our experts offer expertise in Network Modernization, Hybrid Cloud, Cyber Security, and Enterprise IT for defense and security sectors |
967 |
| 63 |
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 |
| 64 |
NCI Information Systems, Inclinkedin.com
The company, now known as Empower AI, specializes in artificial intelligence technology Follow their LinkedIn page for updates |
936 |
| 65 |
Vangent, Inc.vangent.com
A global provider of information management and strategic business process services for Federal government, commercial, education, and healthcare organizations Offices in US, UK, and Canada |
911 |
| 66 |
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 |
| 67 |
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 |
| 68 |
Synergysynergybis.com
Federal IT firm specializing in cloud, low/no code SaaS platforms, delivering agile MVP solutions to accelerate agency modernization goals. |
865 |
| 69 |
REI Systemsreisystems.com
Providing innovative technology solutions to federal, state, local, and nonprofit organizations for improved decision-making and streamlined processes. |
862 |
| 70 | 856 | |
| 71 |
Centrocentrocdx.com
A multinational provider of customer contact solutions, business process management, and healthcare services with a focus on investing in people for success |
845 |
| 72 |
CNSIacentra.com
Provider of health information technology solutions for state and federal agencies, delivering innovative, cost-effective products to improve healthcare outcomes for millions of Americans |
836 |
| 73 |
Cognosanteaccenture.com
This company partners with federal agencies to innovate and implement solutions using leading technologies for delivering public services and programs effectively |
816 |
| 74 |
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 |
| 75 |
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 |
| 76 |
Salient CRGTgovcio.com
Providing comprehensive government IT consulting and management services focused on mission success, innovation, and long-term client partnerships. |
790 |
| 77 |
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 |
| 78 |
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 |
| 79 |
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 |
| 80 |
Steampunk, Inc.careers-steampunk.icims.com
Federal government-focused company with a startup culture, prioritizing human-centered delivery to drive mission impacts and user experience |
743 |
| 81 |
By Light Professional IT Servicesbylight.com
Hardware and software engineering services provider for defense, civilian, and commercial sectors worldwide, offering reliable and cost-effective IT solutions |
731 |
| 82 |
L-3 National Security Solutionscaci.com
A company that was acquired by CACI International Inc on February 1, 2016, specializing in national security solutions Visit https://wwwlinkedincom/company/caci-international-inc |
729 |
| 83 |
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 |
| 84 |
Tata Group - North Americatata.com
Global business group with diverse operations including IT services, consulting, steel production, luxury hotels, automotive engineering, mining, consumer brands, and philanthropic activities |
699 |
| 85 |
AMSEC LLC, A Subsidiary of Huntington Ingalls Industrieshii.com
A global company with over 35 locations providing maintenance, modernization, unmanned systems development, engineering, logistics, software development, and training solutions |
698 |
| 86 |
WillowTreewillowtreeapps.com
A global digital agency founded in 2008, WillowTree partners with Fortune 500 brands to deliver innovative digital products and exceptional customer experiences |
693 |
| 87 |
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 |
| 88 | 663 | |
| 89 |
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 |
| 90 |
MetroStarmetrostar.com
Leading provider of secure digital transformation and AI-enabled products and solutions, specializing in delivering cutting-edge IT services to government agencies and defense organizations. |
620 |
| 91 |
Alpha Omegaalphaomega.com
Alpha Omega specializes in providing mission-focused solutions in cybersecurity, data and AI, and digital modernization for national security, foreign affairs, and climate science |
613 |
| 92 |
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 |
| 93 |
CPGcpgbeyondthecloud.com
This company provides design, construction, and analytics-driven operations solutions for conventional, hyperscale, and edge data centers in North America |
602 |
| 94 |
Core4cecore4ce.com
Mission-oriented company serving national security community by building, modernizing, and defending digital infrastructure with expertise in cyber operations, modernization, engineering, and analysis |
599 |
| 95 |
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 |
| 96 |
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 |
| 97 |
Vencore Inc.peraton.com
A diverse company providing innovative solutions to US government customers in defense, intelligence, civilian, healthcare, and state/local markets through mission services and digital transformation |
563 |
| 98 |
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 |
| 99 |
ActioNet, Inc.actionet.com
A woman-owned IT solutions provider specializing in Cloud-based Solutions, Cyber Security, and Agile Software Engineering, with strong qualifications and expertise |
543 |
| 100 |
Zenetexzenetex.com
Specializing in management and technology support services, this company provides IT, engineering, logistics, program management, and training solutions to government and commercial clients |
500 |
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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 Oct 24, 2026.
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The same list elsewhere in United States
- IT services companies in the United States 3,295
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- IT services companies in New York State 275
- IT services companies in New Jersey 238
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- IT services companies in Illinois 166
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- IT services companies in Massachusetts 93
- IT services companies in Maryland 90
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