Company lists · Data verified August 2026

Top 25 Cybersecurity defense contractors based in the United States

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 5,071 companies tracked

There are 5,071 cybersecurity defense contractors headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 285,412 professional contacts across them, including 55,583 with verified work emails and 118,573 with mobile numbers. New York is the largest hub.

This list covers cybersecurity defense contractors headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

5,071Companies

285,412Contacts tracked

55,583Verified emails

118,573Mobile numbers

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The 25 largest cybersecurity defense contractors based in the United States

Ranked by team size

Top 25 of 5,071 cybersecurity defense contractors based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Northrop Grumman	San Diego, CA	10001+	75,000	1,247
2	Raytheon	Arlington, VA	10001+	42,746	1,421
3	L3harris Technologies	Melbourne, FL	10001+	24,757	932
4	Symantec	San Jose, CA	10001+	11,179	876
5	Sierra Nevada Corporation	Sparks, NV	1,001-5,000	4,442	81
6	Trellix	Plano, TX	1,001-5,000	3,490	1,633
7	Sentinelone	Mountain View, CA	1,001-5,000	3,046	1,926
8	OPTIV	Chantilly, VA	1,001-5,000	2,206	1,422
9	Bitdefender	Fort Lauderdale, FL	1,001-5,000	2,141	1,230
10	Barracuda	Alpharetta, GA	1,001-5,000	2,108	1,463
11	Paragon Systems INC	Herndon, VA	10001+	1,946	75
12	Fortra	Eden Prairie, MN	1,001-5,000	1,640	1,037
13	Forcepoint	Austin, TX	1,001-5,000	1,620	1,084
14	Reliaquest	Sandy, UT	1,001-5,000	1,252	980
15	Thales Cybersecurity Products	Austin, TX	1,001-5,000	1,252	645
16	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
17	Imperva	Austin, TX	10001+	1,211	829
18	VT Group VTG	California, MD	1,001-5,000	1,180	481
19	Agile Defense	Huntsville, AL	1,001-5,000	1,080	402
20	Radiance Technologies	Baton Rouge, LA	1,001-5,000	1,037	19
21	Coalfire	Chicago, IL	1,001-5,000	960	613
22	Tyto Athene, LLC	Amherst, VA	1,001-5,000	858	16
23	Arcfield	Chantilly, VA	1,001-5,000	791	12
24	Vikingcloud	Chicago, IL	1,001-5,000	618	436
25	Planned Systems International	Valparaiso, FL	1,001-5,000	608	316

Showing 25 of 5,071 cybersecurity defense contractors based in the United States

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Cybersecurity defense contractors based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 141 HQs

118,573Contacts with mobile numbers

124Emails re-verified in last 30 days

Companies by employee count

1-10

2,593

11-50

1,624

51-200

597

201-500

124

501-1,000

1,001-5,000

10001+

Cybersecurity defense contractors by metro

Metro	Companies
Cybersecurity defense contractors in New York	141
Cybersecurity defense contractors in Washington	116
Cybersecurity defense contractors in Miami	88
Cybersecurity defense contractors in Austin	86
Cybersecurity defense contractors in Atlanta	85
Cybersecurity defense contractors in Houston	85
Cybersecurity defense contractors in Dallas	76

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity defense contractors”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 124 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cybersecurity defense contractors are there based in the United States?

There are 5,071 cybersecurity defense contractors headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Northrop Grumman, headquartered in San Diego, tops this list with the largest team on record.

Which city has the most cybersecurity defense contractors?

New York leads with 141 headquartered companies, followed by Washington (116) and Miami (88).

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 55,583 verified decision-maker contacts tracked across these 5,071 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.