Company lists · Data verified August 2026

Top 25 Cybersecurity defense consultants based in the United States

Name: Cybersecurity defense consultants 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 6,790 companies tracked

There are 6,790 cybersecurity defense consultants headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 112,756 professional contacts across them, including 38,328 with verified work emails and 36,870 with mobile numbers. New York is the largest hub.

This list covers cybersecurity defense consultants 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.

6,790Companies

112,756Contacts tracked

38,328Verified emails

36,870Mobile numbers

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The 25 largest cybersecurity defense consultants based in the United States

Ranked by team size

Top 25 of 6,790 cybersecurity defense consultants 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	Symantec	San Jose, CA	10001+	11,179	876
2	Trellix	Plano, TX	1,001-5,000	3,490	1,633
3	OPTIV	Chantilly, VA	1,001-5,000	2,206	1,422
4	Bitdefender	Fort Lauderdale, FL	1,001-5,000	2,141	1,230
5	Barracuda	Alpharetta, GA	1,001-5,000	2,108	1,463
6	Thales Cybersecurity Products	Austin, TX	1,001-5,000	1,252	645
7	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
8	Imperva	Austin, TX	10001+	1,211	829
9	Watchguard Technologies	Seattle, WA	1,001-5,000	1,054	631
10	Coalfire	Chicago, IL	1,001-5,000	960	613
11	Arcfield	Chantilly, VA	1,001-5,000	791	12
12	Absolute Security	Seattle, WA	501-1,000	789	449
13	Threatlocker	Orlando, FL	501-1,000	725	406
14	Telos Corporation	Las Vegas, NV	501-1,000	636	230
15	Vikingcloud	Chicago, IL	1,001-5,000	618	436
16	Planned Systems International	Valparaiso, FL	1,001-5,000	608	316
17	Ultraviolet Cyber	Phoenix, AZ	501-1,000	517	258
18	Securityhq	New York, NY	501-1,000	492	279
19	United Security, Inc. USI	Boston, MA	1,001-5,000	409	72
20	Macaulay-Brown, Inc. Macb , An Alion Company	Dayton, OH	1,001-5,000	382	11
21	System High Corporation	Chantilly, VA	501-1,000	369	177
22	Markon	Falls Church, VA	501-1,000	271	137
23	VMD Corp	Sacramento, CA	501-1,000	251	6
24	GM Sectec	Santurce	1,001-5,000	241	69
25	Tricorps	Oklahoma City, OK	501-1,000	232	23

Showing 25 of 6,790 cybersecurity defense consultants based in the United States

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Cybersecurity defense consultants based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 211 HQs

36,870Contacts with mobile numbers

74Emails re-verified in last 30 days

Companies by employee count

1-10

4,011

11-50

1,971

51-200

572

201-500

115

501-1,000

1,001-5,000

10001+

Cybersecurity defense consultants by metro

Metro	Companies
Cybersecurity defense consultants in New York	211
Cybersecurity defense consultants in Washington	157
Cybersecurity defense consultants in Houston	127
Cybersecurity defense consultants in Atlanta	126
Cybersecurity defense consultants in Miami	109
Cybersecurity defense consultants in Austin	107
Cybersecurity defense consultants in Dallas	106

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 consultants”, 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; 74 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 consultants are there based in the United States?

There are 6,790 cybersecurity defense consultants headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Symantec, headquartered in San Jose, tops this list with the largest team on record.

Which city has the most cybersecurity defense consultants?

New York leads with 211 headquartered companies, followed by Washington (157) and Houston (127).

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 38,328 verified decision-maker contacts tracked across these 6,790 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.