Company lists · Data refreshed September 2026

Top 25 Defense contractor cybersecurity services worldwide

Name: Defense contractor cybersecurity services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 13,882 companies tracked

RevenueBase identified 13,882 company matches for defense contractor cybersecurity services worldwide as of September 2026 and tracks 459,626 professional contacts across them, including 76,243 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for defense contractor cybersecurity services worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026. Country and city lists for defense contractor cybersecurity services follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

13,882Companies

459,626Contacts tracked

76,243Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest defense contractor cybersecurity services worldwide

Ranked by team size

Top 25 of 13,882 company matches for defense contractor cybersecurity services worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Northrop Grumman	Exact match	Falls Church, VA, United StatesHQ recorded Sep 28, 2026	10001+	74,984 contacts →
	Exact match “We are a close-knit community of big thinkers collaborating to keep the world safe.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Raytheon	Exact match	Arlington, VA, United StatesHQ recorded Sep 28, 2026	10001+	42,937 contacts →
	Exact match “Raytheon, an RTX business, creates next-generation defense solutions that are smarter, faster and better than previously thought possible.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	L3harris Technologies	Exact match	Melbourne, FL, United StatesHQ recorded Sep 28, 2026	10001+	24,855 contacts →
	Exact match “L3Harris Technologies is the Trusted Disruptor in the defense industry.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Fortinet	Exact match	Sunnyvale, CA, United StatesHQ recorded Sep 28, 2026	10001+	14,289 contacts →
	Exact match “Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	BAE Systems, INC	Exact match	Falls Church, VA, United StatesHQ recorded Sep 28, 2026	10001+	12,898 contacts →
	Exact match “Improving the future and protecting lives is an ambitious mission, but it’s what we do.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Private Sector	Exact match	United StatesHQ recorded Sep 28, 2026	n/a	12,771 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Symantec	Exact match	San Jose, CA, United StatesHQ recorded Sep 28, 2026	10001+	11,169 contacts →
	Exact match “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Peraton	Exact match	Reston, VA, United StatesHQ recorded Sep 28, 2026	10001+	10,793 contacts →
	Exact match “At Peraton, we're at the forefront of delivering the next big thing every day.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Dyncorp International	Exact match	Mclean, VA, United StatesHQ recorded Sep 28, 2026	10001+	9,964 contacts →
	Exact match “DynCorp International is now part of Amentum.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	Mantech	Exact match	Herndon, VA, United StatesHQ recorded Sep 28, 2026	5,001-10,000	9,697 contacts →
	Exact match “MANTECH is more than a technology company.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Leonardo DRS	Exact match	Arlington, VA, United StatesHQ recorded Sep 28, 2026	5,001-10,000	5,980 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Asrc Federal	Exact match	Reston, VA, United StatesHQ recorded Sep 28, 2026	5,001-10,000	4,542 contacts →
	Exact match “ASRC Federal’s employees provide solutions for more than 30 U.S.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Sierra Nevada Corporation	Exact match	Sparks, NV, United StatesHQ recorded Sep 28, 2026	1,001-5,000	4,484 contacts →
	Exact match “SNC is a trusted global leader in aerospace and national security.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	OPTIV	Exact match	Leawood, KS, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,222 contacts →
	Exact match “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Paragon Systems INC	Exact match	Herndon, VA, United StatesHQ recorded Sep 28, 2026	10001+	1,949 contacts →
	Exact match “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Modern Technology Solutions, Inc. Mtsi	Exact match	Alexandria, VA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,920 contacts →
	Exact match “Modern Technology Solutions, Inc.(MTSI) is a 100% employee-owned engineering services and technology solutions company delivering first-choice capabilities to solve problems of…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Dynetics, INC	Exact match	Huntsville, AL, United StatesHQ recorded Sep 28, 2026	10001+	1,532 contacts →
	Exact match “Leidos Dynetics provides responsive, cost-effective engineering, scientific, IT solutions to the national security, cybersecurity, space, and critical infrastructure sectors.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Terma Group	Exact match	Lystrup, DenmarkHQ recorded Sep 28, 2026	1,001-5,000	1,525 contacts →
	Exact match “Defense is a silent shield in an unpredictable world.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Csra INC	Exact match	Falls Church, VA, United StatesHQ recorded Sep 28, 2026	10001+	1,495 contacts →
	Exact match “General Dynamics Information Technology and CSRA have united to create the premier provider of high-tech IT solutions to the government IT market.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Qinetiq US	Exact match	Mclean, VA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,383 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Site سايت	Exact match	Al Nakheel, Saudi ArabiaHQ recorded Sep 28, 2026	501-1,000	1,378 contacts →
	Exact match “We are established for enriching local content in designing, developing, and operating secure digital computing environments through Saudi talents, by fulfilling our role as a…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Sangfor Technologies	Exact match	Shenzhen, ChinaHQ recorded Sep 28, 2026	5,001-10,000	1,297 contacts →
	Exact match “Sangfor Technologies is a global leader in cybersecurity, cloud computing, and IT infrastructure, providing fully integrated and AI-driven solutions.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Guidepoint Security	Exact match	Reston, VA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,232 contacts →
	Exact match “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	VT Group VTG	Exact match	Alexandria, VA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,168 contacts →
	Exact match “VTG delivers force modernization and digital transformation solutions that expand America’s competitive advantage in the modern battlespace.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Tahaluf AL Emarat Technical Solutions تحالف الإمارات للحلول التقنية	Exact match	Abu Dhabi, United Arab EmiratesHQ recorded Sep 28, 2026	501-1,000	1,159 contacts →
	Exact match “Founded in Abu Dhabi in 2015, Tahaluf has quickly established itself as one of the nation's top cybersecurity and IT companies and the leading government solutions provider for…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “defense contractor cybersecurity services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 13,882 defense contractor cybersecurity services worldwide

See the full list, filter by size, metro and specialty, and access 76,243 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Defense contractor cybersecurity services worldwide at a glance

As of Sep 28, 2026

16.6%Verified-email coverage

33.1Average contacts per company

1-10Median size (employees)

2.0%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

7,403

11-50

4,522

51-200

1,374

201-500

346

501-1,000

101

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for defense contractor cybersecurity services are linked below.
What qualifies: Company records worldwide whose business descriptions match “defense contractor cybersecurity services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 76,243 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Defense contractor cybersecurity services by location

112 lists · largest first

Every Defense contractor cybersecurity services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “defense contractor cybersecurity services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many defense contractor cybersecurity services are there worldwide?

RevenueBase identified 13,882 company matches for defense contractor cybersecurity services worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Northrop Grumman tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most defense contractor cybersecurity services?

The United States leads with 4,444 companies, followed by India (997) and the United Kingdom (717). Every defense contractor cybersecurity services list by country and city is linked on this page.

Which city has the most defense contractor cybersecurity services?

London leads with 273 company records, followed by Dubai (127) and Paris (121).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 76,243 professional contacts with verified work emails tracked across these 13,882 companies; direct dials are available where recorded.

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.

Ready to reach these companies? Verified emails and direct dials for all 13,882 defense contractor cybersecurity services worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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 SmartSearch, 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.