Company lists · Data verified August 2026

Top 25 Cybersecurity startups based in the United States

Name: Cybersecurity startups 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 5,836 companies tracked

There are 5,836 cybersecurity startups headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 152,176 professional contacts across them, including 66,521 with verified work emails and 46,222 with mobile numbers. New York is the largest hub.

This list covers cybersecurity startups 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.

5,836Companies

152,176Contacts tracked

66,521Verified emails

46,222Mobile numbers

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The 25 largest cybersecurity startups based in the United States

Ranked by team size

Top 25 of 5,836 cybersecurity startups 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	Ivanti	San Jose	1,001-5,000	2,666	1,783
8	OPTIV	Chantilly, VA	1,001-5,000	2,206	1,422
9	Tenable	Columbia, MD	1,001-5,000	2,158	1,311
10	Bitdefender	Fort Lauderdale, FL	1,001-5,000	2,141	1,230
11	Barracuda	Alpharetta, GA	1,001-5,000	2,108	1,463
12	Acronis	Burlington, MA	1,001-5,000	2,081	1,080
13	Beyondtrust	Johns Creek, GA	1,001-5,000	1,650	1,329
14	Fortra	Eden Prairie, MN	1,001-5,000	1,640	1,037
15	Reliaquest	Sandy, UT	1,001-5,000	1,252	980
16	Thales Cybersecurity Products	Austin, TX	1,001-5,000	1,252	645
17	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
18	Imperva	Austin, TX	10001+	1,211	829
19	Forescout Technologies INC	San Jose, CA	1,001-5,000	1,165	841
20	Watchguard Technologies	Seattle, WA	1,001-5,000	1,054	631
21	Netenrich	San Jose, CA	501-1,000	885	261
22	Absolute Security	Seattle, WA	501-1,000	789	449
23	Threatlocker	Orlando, FL	501-1,000	725	406
24	Coalition, INC	San Francisco, CA	501-1,000	719	562
25	Huntress	Columbia, MD	501-1,000	694	135

Showing 25 of 5,836 cybersecurity startups based in the United States

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Cybersecurity startups based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 228 HQs

46,222Contacts with mobile numbers

124Emails re-verified in last 30 days

Companies by employee count

1-10

3,155

11-50

1,871

51-200

565

201-500

122

501-1,000

1,001-5,000

10001+

Cybersecurity startups by metro

Metro	Companies
Cybersecurity startups in New York	228
Cybersecurity startups in San Francisco	128
Cybersecurity startups in Austin	122
Cybersecurity startups in Washington	109
Cybersecurity startups in Atlanta	108
Cybersecurity startups in Miami	104
Cybersecurity startups in Houston	103

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 startups”, 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 startups are there based in the United States?

There are 5,836 cybersecurity startups 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 startups?

New York leads with 228 headquartered companies, followed by San Francisco (128) and Austin (122).

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 66,521 verified decision-maker contacts tracked across these 5,836 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.