Company lists · Data refreshed September 2026

Top 25 Cybersecurity and defense software companies based in the United States

Name: Cybersecurity and defense software companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 2,175 companies tracked

RevenueBase identified 2,175 company matches for cybersecurity and defense software companies associated with the United States as of September 2026 and tracks 204,771 professional contacts across them, including 30,241 with verified work emails and 86,174 with mobile numbers. New York is the largest hub.

This list covers company matches for cybersecurity and defense software companies associated with the United States, 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 1, 2026.

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 1, 2026 How this list was built

2,175Companies

204,771Contacts tracked

30,241Verified emails

86,174Mobile numbers

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

The 25 largest cybersecurity and defense software companies based in the United States

Ranked by team size

Top 25 of 2,175 company matches for cybersecurity and defense software companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 1, 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	San Diego, CA, United States	10001+	75,000 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 1, 2026 · View company records in RevenueBase
2	L3harris Technologies	Exact match	Melbourne, FL, United States	10001+	24,757 contacts →
	Exact match “L3Harris Technologies is the Trusted Disruptor in the defense industry.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
3	Symantec	Exact match	San Jose, CA, United States	10001+	11,179 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 1, 2026 · View company records in RevenueBase
4	Peraton	Exact match	San Diego, CA, United States	10001+	10,741 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 1, 2026 · View company records in RevenueBase
5	Trellix	Exact match	Plano, TX, United States	1,001-5,000	3,490 contacts →
	Exact match “Trellix is a global cybersecurity company delivering intelligence-led cyber resilience for security-conscious organizations at any stage of their journey.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
6	Ivanti	Exact match	San Jose, United States	1,001-5,000	2,666 contacts →
	Exact match “Ivanti is a global enterprise IT and security software company dedicated to unlocking human potential by managing, automating and protecting data and systems to empower continuous…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
7	Bitdefender	Exact match	Fort Lauderdale, FL, United States	1,001-5,000	2,141 contacts →
	Exact match “Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
8	Barracuda	Exact match	Alpharetta, GA, United States	1,001-5,000	2,108 contacts →
	Exact match “Barracuda is a leading global cybersecurity company providing complete protection against complex threats for all size business.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
9	Fortra	Exact match	Eden Prairie, MN, United States	1,001-5,000	1,640 contacts →
	Exact match “Fortra delivers AI-amplified cybersecurity solutions that help organizations use and protect data with confidence.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
10	Forcepoint	Exact match	Austin, TX, United States	1,001-5,000	1,620 contacts →
	Exact match “Forcepoint simplifies security for global businesses and governments.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
11	Dynetics, INC	Exact match	Huntsville, AL, United States	10001+	1,533 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 1, 2026 · View company records in RevenueBase
12	Qinetiq US	Exact match	Reston, VA, United States	1,001-5,000	1,388 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 1, 2026 · View company records in RevenueBase
13	Thales Cybersecurity Products	Exact match	Austin, TX, United States	1,001-5,000	1,252 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
14	Imperva	Exact match	Austin, TX, United States	10001+	1,211 contacts →
	Exact match “On Dec.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
15	Agile Defense	Exact match	Huntsville, AL, United States	1,001-5,000	1,080 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
16	Watchguard Technologies	Exact match	Seattle, WA, United States	1,001-5,000	1,054 contacts →
	Exact match “WatchGuard® Technologies, Inc.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
17	Radiance Technologies	Exact match	Baton Rouge, LA, United States	1,001-5,000	1,037 contacts →
	Exact match “Radiance Technologies, Inc.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
18	Tyto Athene, LLC	Exact match	Amherst, VA, United States	1,001-5,000	858 contacts →
	Exact match “At Tyto Athene, we help turn Data to Dominance.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
19	Absolute Security	Exact match	Seattle, WA, United States	501-1,000	789 contacts →
	Exact match “Absolute Security is partnered with more than 28 of the world’s leading endpoint device manufacturers, embedded in the firmware of 600 million devices, trusted by global…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
20	STR	Exact match	Arlington, VA, United States	501-1,000	759 contacts →
	Exact match “STR is driven to deliver impact.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
21	Bluehalo, An AV Company	Exact match	Chantilly, VA, United States	1,001-5,000	658 contacts →
	Exact match “BlueHalo is now part of AV, a global defense technology leader built for scale, driven by innovation, and delivering #AllDomainDominance across every domain of modern…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
22	Telos Corporation	Exact match	Las Vegas, NV, United States	501-1,000	636 contacts →
	Exact match “Telos empowers and protects the world’s most security-conscious organizations with solutions for continuous security assurance of individuals, systems, and information.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
23	By Light Professional IT Services	Exact match	Arlington, VA, United States	1,001-5,000	562 contacts →
	Exact match “By Light Professional IT Services LLC, headquartered in McLean, VA, is a leading provider of advanced technology solutions delivering cyber and warfighter training platforms for…” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
24	Ultraviolet Cyber	Exact match	Phoenix, AZ, United States	501-1,000	517 contacts →
	Exact match “UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program.” Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
25	Guidance Software	Exact match	Las Vegas, NV, United States	501-1,000	496 contacts →
	Exact match “Guidance (NASDAQ: GUID) exists to turn chaos and the unknown into order and the known-so that companies and their customers can go about their daily lives as usual without worry…” Recorded in the RevenueBase company graph · Sep 1, 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 “cybersecurity and defense software companies”. 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 2,175 cybersecurity and defense software companies based in the United States

See the full list, filter by size, metro and specialty, and access 30,241 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Cybersecurity and defense software companies based in the United States at a glance

As of Sep 1, 2026

14.8%Verified-email coverage

42.1%Mobile-number coverage

94.1Average contacts per company

11-50Median size (employees)

2.6%Largest-city concentration · New York

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

927

11-50

774

51-200

302

201-500

501-1,000

1,001-5,000

10001+

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.
What qualifies: Company records associated with the United States whose business descriptions match “cybersecurity and defense software companies” 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 30,241 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 1, 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.

Cybersecurity and defense software companies by metro

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 “cybersecurity and defense software companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity and defense software companies are there based in the United States?

RevenueBase identified 2,175 company matches for cybersecurity and defense software companies associated with the United States 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 city has the most cybersecurity and defense software companies?

New York leads with 56 company records, followed by Washington (53) and Austin (42).

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 30,241 professional contacts with verified work emails tracked across these 2,175 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 1, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,175 cybersecurity and defense software companies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Cybersecurity and defense software companies by geography

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.