Company lists · Data refreshed September 2026

Top 25 Defense IT consulting firms based in the United States

Name: Defense IT consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 9,223 companies tracked

RevenueBase identified 9,223 defense IT consulting firms headquartered in the United States as of September 2026 and tracks 531,837 professional contacts across them, including 102,728 with verified work emails. Washington is the largest hub.

This list covers defense IT consulting firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

9,223Companies

531,837Contacts tracked

102,728Verified emails

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The 25 largest defense IT consulting firms based in the United States

Ranked by team size

Top 25 of 9,223 defense IT consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to defense IT consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Northrop Grumman	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 28, 2026	10001+	74,984 contacts →
	Indirect evidence “We are a close-knit community of big thinkers collaborating to keep the world safe.” Source: RevenueBase Database · checked Sep 28, 2026
2	Leidos	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	10001+	27,416 contacts →
	Indirect evidence “Leidos is an industry and technology leader serving government & commercial customers with smarter, more efficient digital and mission innovations.” Source: RevenueBase Database · checked Sep 28, 2026
3	General Dynamics Information Technology	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 28, 2026	10001+	23,974 contacts →
	Indirect evidence “GDIT is a global technology and professional services company that delivers solutions, technology and mission services to every major agency across the U.S.” Source: RevenueBase Database · checked Sep 28, 2026
4	Parsons Corporation	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 28, 2026	10001+	19,456 contacts →
	Partial evidence “Founded in 1944, Parsons Corporation, a digitally enabled solutions provider, is focused on creating the future of the defense, intelligence, and critical infrastructure markets.” Source: RevenueBase Database · checked Sep 28, 2026
5	Caci International INC	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	10001+	19,221 contacts →
	Indirect evidence “At CACI International Inc (NYSE: CACI), our talented and dynamic employees are ever vigilant in delivering distinctive expertise and technology to meet our customers’ greatest…” Source: RevenueBase Database · checked Sep 28, 2026
6	CDW	Indirect evidence	Vernon Hills, IL, United StatesHQ checked Sep 28, 2026	10001+	13,155 contacts →
	Indirect evidence “At CDW, we know how to make technology work so people can do great things.” Source: RevenueBase Database · checked Sep 28, 2026
7	Guidehouse	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	10001+	12,815 contacts →
	Indirect evidence “Guidehouse is a global AI-led professional services firm delivering advisory, technology, and managed services to the commercial and government sectors.” Source: RevenueBase Database · checked Sep 28, 2026
8	Peraton	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	10001+	10,793 contacts →
	Indirect evidence “At Peraton, we're at the forefront of delivering the next big thing every day.” Source: RevenueBase Database · checked Sep 28, 2026
9	Dyncorp International	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	10001+	9,964 contacts →
	Indirect evidence “DynCorp International is now part of Amentum.” Source: RevenueBase Database · checked Sep 28, 2026
10	Mantech	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 28, 2026	5,001-10,000	9,697 contacts →
	Indirect evidence “MANTECH is more than a technology company.” Source: RevenueBase Database · checked Sep 28, 2026
11	Asrc Federal	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	5,001-10,000	4,542 contacts →
	Indirect evidence “ASRC Federal’s employees provide solutions for more than 30 U.S.” Source: RevenueBase Database · checked Sep 28, 2026
12	Aricent	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	10001+	4,302 contacts →
	Indirect evidence “Aricent is now Altran, delivering industry innovations at future speed.” Source: RevenueBase Database · checked Sep 28, 2026
13	Quest Software	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	3,206 contacts →
	Indirect evidence “At Quest Software, we help organizations build modern, trusted foundations for AI.” Source: RevenueBase Database · checked Sep 28, 2026
14	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,222 contacts →
	Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Sep 28, 2026
15	Paragon Systems INC	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 28, 2026	10001+	1,949 contacts →
	Indirect evidence “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Source: RevenueBase Database · checked Sep 28, 2026
16	Modern Technology Solutions, Inc. Mtsi	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,920 contacts →
	Indirect evidence “Modern Technology Solutions, Inc.(MTSI) is a 100% employee-owned engineering services and technology solutions company delivering first-choice capabilities to solve problems of…” Source: RevenueBase Database · checked Sep 28, 2026
17	Scientific Research Corporation	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,917 contacts →
	Indirect evidence “Scientific Research Corporation is an advanced engineering company that was founded in 1988 to provide innovative solutions to the U.S.” Source: RevenueBase Database · checked Sep 28, 2026
18	American Systems	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,899 contacts →
	Indirect evidence “Founded in 1975, AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of…” Source: RevenueBase Database · checked Sep 28, 2026
19	DCS Corp	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,898 contacts →
	Indirect evidence “DCS delivers advanced technology and management solutions to Government agencies in the national security sector.” Source: RevenueBase Database · checked Sep 28, 2026
20	SOSI	Partial evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,859 contacts →
	Partial evidence “Founded in 1989 and headquartered in Reston, Virginia, SOSi is a private, founder-led defense and government solutions firm specializing in advanced technology systems and mission…” Source: RevenueBase Database · checked Sep 28, 2026
21	Perspecta	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 28, 2026	10001+	1,753 contacts →
	Indirect evidence “At Perspecta we question, we seek and we solve.” Source: RevenueBase Database · checked Sep 28, 2026
22	DMI	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,683 contacts →
	Indirect evidence “DMI is a leading provider of digital services and technology solutions with a focus on end-to-end managed services, including managed mobility, cloud, cybersecurity, network…” Source: RevenueBase Database · checked Sep 28, 2026
23	ASM Research	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,568 contacts →
	Indirect evidence “ASM Research, an Accenture Federal Services Company, is an information solutions integrator and a leading provider of innovative technology solutions and advanced analytical…” Source: RevenueBase Database · checked Sep 28, 2026
24	Government Acquisitions	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 28, 2026	n/a	1,440 contacts →
	Indirect evidence “Government Acquisitions, LLC (GAI) stands at the forefront of a transformative era, where artificial intelligence is reshaping our world and the stakes have never been higher.” Source: RevenueBase Database · checked Sep 28, 2026
25	V Group INC	Indirect evidence	Cranbury, NJ, United StatesHQ checked Sep 28, 2026	n/a	1,347 contacts →
	Indirect evidence “Since V Group Inc.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: defense IT consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names defense IT consulting firms.
Partial evidence: Its own public description names part of defense IT consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name defense IT consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 9,223 defense IT consulting firms based in the United States

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Defense IT consulting firms based in the United States at a glance

As of Sep 28, 2026

19.3%Verified-email coverage

57.7Average contacts per company

11-50Median size (employees)

3.1%Largest-city concentration · Washington

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

4,083

11-50

2,996

51-200

1,486

201-500

402

501-1,000

120

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 9,223 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among defense IT consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “defense IT consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names defense IT consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among defense IT consulting firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 102,728 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Defense IT consulting firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names defense IT consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many defense IT consulting firms are there based in the United States?

RevenueBase identified 9,223 defense IT consulting firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Northrop Grumman, headquartered in Falls Church, tops this list with the largest team on record.

Which city has the most defense IT consulting firms?

Washington leads with 282 headquartered companies, followed by Reston (186) and New York (179).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 102,728 verified decision-maker contacts tracked across these 9,223 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.