Company lists · Data refreshed September 2026

Top 25 Defense contractor cybersecurity services based in the United States

Name: Defense contractor cybersecurity services 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 4,444 companies tracked

RevenueBase identified 4,444 defense contractor cybersecurity services headquartered in the United States as of September 2026 and tracks 337,160 professional contacts across them, including 48,588 with verified work emails. Washington is the largest hub.

This list covers defense contractor cybersecurity services 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

4,444Companies

337,160Contacts tracked

48,588Verified emails

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The 25 largest defense contractor cybersecurity services based in the United States

Ranked by team size

Top 25 of 4,444 defense contractor cybersecurity services 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 contractor cybersecurity services: 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	Raytheon	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	10001+	42,937 contacts →
	Partial evidence “Raytheon, an RTX business, creates next-generation defense solutions that are smarter, faster and better than previously thought possible.” Source: RevenueBase Database · checked Sep 28, 2026
3	L3harris Technologies	Partial evidence	Melbourne, FL, United StatesHQ checked Sep 28, 2026	10001+	24,855 contacts →
	Partial evidence “L3Harris Technologies is the Trusted Disruptor in the defense industry.” Source: RevenueBase Database · checked Sep 28, 2026
4	Fortinet	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 28, 2026	10001+	14,289 contacts →
	Indirect evidence “Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.” Source: RevenueBase Database · checked Sep 28, 2026
5	BAE Systems, INC	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 28, 2026	10001+	12,898 contacts →
	Indirect evidence “Improving the future and protecting lives is an ambitious mission, but it’s what we do.” Source: RevenueBase Database · checked Sep 28, 2026
6	Symantec	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	10001+	11,169 contacts →
	Partial evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	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
9	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
10	Leonardo DRS	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	5,001-10,000	5,980 contacts →
	Partial evidence “Leonardo DRS Inc.(Nasdaq: DRS) is at the forefront of developing transformative defense technologies using its proven agility and delivering innovative solutions for U.S.” 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	Sierra Nevada Corporation	Indirect evidence	Sparks, NV, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,484 contacts →
	Indirect evidence “SNC is a trusted global leader in aerospace and national security.” Source: RevenueBase Database · checked Sep 28, 2026
13	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
14	Paragon Systems INC	Partial evidence	Herndon, VA, United StatesHQ checked Sep 28, 2026	10001+	1,949 contacts →
	Partial 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
15	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
16	Dynetics, INC	Partial evidence	Huntsville, AL, United StatesHQ checked Sep 28, 2026	10001+	1,532 contacts →
	Partial evidence “Leidos Dynetics provides responsive, cost-effective engineering, scientific, IT solutions to the national security, cybersecurity, space, and critical infrastructure sectors.” Source: RevenueBase Database · checked Sep 28, 2026
17	Csra INC	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 28, 2026	10001+	1,495 contacts →
	Indirect evidence “General Dynamics Information Technology and CSRA have united to create the premier provider of high-tech IT solutions to the government IT market.” Source: RevenueBase Database · checked Sep 28, 2026
18	Qinetiq US	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,383 contacts →
	Partial evidence “For over 60 years, QinetiQ US has been providing world-class technology development, engineering research and development and revolutionary products to the defense, security, and…” Source: RevenueBase Database · checked Sep 28, 2026
19	Thales Cybersecurity Products	Partial evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,252 contacts →
	Partial evidence “Thales is a global leader in cybersecurity, helping the most trusted organizations in the world protect their most critical applications, data, and identities anywhere at scale.” Source: RevenueBase Database · checked Sep 28, 2026
20	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,232 contacts →
	Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 28, 2026
21	VT Group VTG	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,168 contacts →
	Indirect evidence “VTG delivers force modernization and digital transformation solutions that expand America’s competitive advantage in the modern battlespace.” Source: RevenueBase Database · checked Sep 28, 2026
22	Agile Defense	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,086 contacts →
	Partial evidence “Agile Defense: Always Evolving Agile Defense stands at the forefront of innovation, driving advanced capabilities and solutions tailored to the most critical national security and…” Source: RevenueBase Database · checked Sep 28, 2026
23	Radiance Technologies	Indirect evidence	Huntsville, AL, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,049 contacts →
	Indirect evidence “Radiance Technologies, Inc.” Source: RevenueBase Database · checked Sep 28, 2026
24	PPC	Indirect evidence	Trevose, PA, United StatesHQ checked Sep 28, 2026	201-500	979 contacts →
	Indirect evidence “PPC is now part of DSA” Source: RevenueBase Database · checked Sep 28, 2026
25	Chugach Government Solutions, LLC	Partial evidence	Anchorage, AK, United StatesHQ checked Sep 28, 2026	1,001-5,000	954 contacts →
	Partial evidence “Chugach Government Solutions,(CGS) is a government contracting company formed by Chugach Alaska Corporation.” 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 contractor cybersecurity services. 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 contractor cybersecurity services.
Partial evidence: Its own public description names part of defense contractor cybersecurity services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name defense contractor cybersecurity services. 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 4,444 defense contractor cybersecurity services based in the United States

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Defense contractor cybersecurity services based in the United States at a glance

As of Sep 28, 2026

14.4%Verified-email coverage

75.9Average contacts per company

11-50Median size (employees)

2.6%Largest-city concentration · Washington

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

2,185

11-50

1,386

51-200

602

201-500

148

501-1,000

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 4,444 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 contractor cybersecurity services, 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 contractor cybersecurity services”. 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 contractor cybersecurity services), 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 contractor cybersecurity services, 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, 48,588 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 contractor cybersecurity services 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 contractor cybersecurity services, 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 contractor cybersecurity services are there based in the United States?

RevenueBase identified 4,444 defense contractor cybersecurity services 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 contractor cybersecurity services?

Washington leads with 115 headquartered companies, followed by New York (81) and Arlington (76).

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 48,588 verified decision-maker contacts tracked across these 4,444 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.