Company lists · Data verified August 2026

Top 25 Cybersecurity firms based in the United States

Name: Cybersecurity firms 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 8,911 companies tracked

There are 8,911 cybersecurity firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 219,411 professional contacts across them, including 90,899 with verified work emails and 71,213 with mobile numbers. New York is the largest hub.

This list covers cybersecurity firms 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.

8,911Companies

219,411Contacts tracked

90,899Verified emails

71,213Mobile numbers

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The 25 largest cybersecurity firms based in the United States

Ranked by team size

Top 25 of 8,911 cybersecurity firms 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	Rubrik	Reston, VA	1,001-5,000	4,381	2,545
3	Commvault	Tinton Falls, NJ	1,001-5,000	4,050	2,207
4	Trellix	Plano, TX	1,001-5,000	3,490	1,633
5	Sentinelone	Mountain View, CA	1,001-5,000	3,046	1,926
6	Qualys	Foster City, CA	1,001-5,000	3,042	2,121
7	Infoblox	Tacoma, WA	1,001-5,000	2,808	1,604
8	Varonis	Scottsdale, AZ	1,001-5,000	2,741	1,673
9	Knowbe4	Clearwater, FL	1,001-5,000	2,378	1,484
10	OPTIV	Chantilly, VA	1,001-5,000	2,206	1,422
11	Tenable	Columbia, MD	1,001-5,000	2,158	1,311
12	Bitdefender	Fort Lauderdale, FL	1,001-5,000	2,141	1,230
13	Barracuda	Alpharetta, GA	1,001-5,000	2,108	1,463
14	Paragon Systems INC	Herndon, VA	10001+	1,946	75
15	Beyondtrust	Johns Creek, GA	1,001-5,000	1,650	1,329
16	Fortra	Eden Prairie, MN	1,001-5,000	1,640	1,037
17	Forcepoint	Austin, TX	1,001-5,000	1,620	1,084
18	Ec-Council	Albuquerque, NM	1,001-5,000	1,269	330
19	Reliaquest	Sandy, UT	1,001-5,000	1,252	980
20	Thales Cybersecurity Products	Austin, TX	1,001-5,000	1,252	645
21	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
22	Imperva	Austin, TX	10001+	1,211	829
23	Forescout Technologies INC	San Jose, CA	1,001-5,000	1,165	841
24	Watchguard Technologies	Seattle, WA	1,001-5,000	1,054	631
25	Tyto Athene, LLC	Amherst, VA	1,001-5,000	858	16

Showing 25 of 8,911 cybersecurity firms based in the United States

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Cybersecurity firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 326 HQs

71,213Contacts with mobile numbers

164Emails re-verified in last 30 days

Companies by employee count

1-10

4,804

11-50

2,811

51-200

893

201-500

203

501-1,000

1,001-5,000

10001+

Cybersecurity firms by metro

Metro	Companies
Cybersecurity firms in New York	326
Cybersecurity firms in Washington	184
Cybersecurity firms in Austin	181
Cybersecurity firms in San Francisco	170
Cybersecurity firms in Atlanta	157
Cybersecurity firms in Houston	149
Cybersecurity firms in Miami	145

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 firms”, 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; 164 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 firms are there based in the United States?

There are 8,911 cybersecurity firms 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 firms?

New York leads with 326 headquartered companies, followed by Washington (184) and Austin (181).

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 90,899 verified decision-maker contacts tracked across these 8,911 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.