Company lists · Data verified August 2026

Top 25 Cybersecurity support companies based in the United States

Name: Cybersecurity support companies 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 7,120 companies tracked

There are 7,120 cybersecurity support companies headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 121,485 professional contacts across them, including 44,645 with verified work emails and 38,943 with mobile numbers. New York is the largest hub.

This list covers cybersecurity support companies 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.

7,120Companies

121,485Contacts tracked

44,645Verified emails

38,943Mobile numbers

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The 25 largest cybersecurity support companies based in the United States

Ranked by team size

Top 25 of 7,120 cybersecurity support companies 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	Fortra	Eden Prairie, MN	1,001-5,000	1,640	1,037
7	Thales Cybersecurity Products	Austin, TX	1,001-5,000	1,252	645
8	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
9	Imperva	Austin, TX	10001+	1,211	829
10	Watchguard Technologies	Seattle, WA	1,001-5,000	1,054	631
11	Coalfire	Chicago, IL	1,001-5,000	960	613
12	Absolute Security	Seattle, WA	501-1,000	789	449
13	TPX	South San Francisco, CA	1,001-5,000	767	364
14	Huntress	Columbia, MD	501-1,000	694	135
15	IT Solutions	New Orleans, LA	501-1,000	680	217
16	Telos Corporation	Las Vegas, NV	501-1,000	636	230
17	Vikingcloud	Chicago, IL	1,001-5,000	618	436
18	Vc3	Memphis, TN	501-1,000	517	374
19	Ultraviolet Cyber	Phoenix, AZ	501-1,000	517	258
20	Securityhq	New York, NY	501-1,000	492	279
21	DUO Security	Austin, TX	501-1,000	429	21
22	United Security, Inc. USI	Boston, MA	1,001-5,000	409	72
23	Markon	Falls Church, VA	501-1,000	271	137
24	GM Sectec	Santurce	1,001-5,000	241	69
25	Mindpoint Group, A Tyto Athene Company	Reston, VA	1,001-5,000	208	7

Showing 25 of 7,120 cybersecurity support companies based in the United States

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Cybersecurity support companies based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 220 HQs

38,943Contacts with mobile numbers

89Emails re-verified in last 30 days

Companies by employee count

1-10

4,094

11-50

2,203

51-200

577

201-500

123

501-1,000

1,001-5,000

10001+

Cybersecurity support companies by metro

Metro	Companies
Cybersecurity support companies in New York	220
Cybersecurity support companies in Houston	121
Cybersecurity support companies in Washington	119
Cybersecurity support companies in Miami	118
Cybersecurity support companies in Atlanta	117
Cybersecurity support companies in Austin	113
Cybersecurity support companies in Chicago	107

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 support companies”, 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; 89 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 support companies are there based in the United States?

There are 7,120 cybersecurity support companies 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 support companies?

New York leads with 220 headquartered companies, followed by Houston (121) and Washington (119).

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 44,645 verified decision-maker contacts tracked across these 7,120 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.