Company lists · Data refreshed October 2026

Top 25 Cybersecurity companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 8,998 companies tracked

Our directory lists 8,998 cybersecurity companies based in the United States, with 454,413 professional contacts and 169,513 email addresses. The list was last updated in October 2026, and New York is the single most-represented city among the companies listed.

Cybersecurity companies provide products and services that protect systems, networks, applications, devices, and data from unauthorized access, disruption, or misuse. This list covers companies that provide cybersecurity products, services, consulting, assessments, monitoring, incident response, or related protection for digital systems and data. Ranked by team size, largest first. Data current as of October 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Oct 1, 2026 86% judged on-target in blind review

8,998Companies

454,413Contacts tracked

169,513Verified emails

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The 25 largest cybersecurity companies based in the United States

Ranked by team size

Top 25 of 8,998 cybersecurity companies based in the United States, ranked by team size, largest first. Data refreshed Oct 1, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	CISCO	Indirect evidence	San Jose, CA, United StatesHQ checked Oct 1, 2026	10001+	137,277 contacts →
	Indirect evidence “Cisco is the worldwide technology leader that is revolutionizing the way organizations connect and protect in the AI era.” Source: RevenueBase Database · checked Oct 1, 2026
2	Palo Alto Networks	Strong evidence	Santa Clara, CA, United StatesHQ checked Oct 1, 2026	10001+	18,431 contacts →
	Strong evidence “Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate.” Source: RevenueBase Database · checked Oct 1, 2026
3	Fortinet	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Oct 1, 2026	10001+	14,289 contacts →
	Indirect evidence “Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.” Source: RevenueBase Database · checked Oct 1, 2026
4	Symantec	Strong evidence	San Jose, CA, United StatesHQ checked Oct 1, 2026	10001+	11,169 contacts →
	Strong evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Oct 1, 2026
5	Crowdstrike	Strong evidence	Remote, United StatesHQ checked Oct 1, 2026	5,001-10,000	10,118 contacts →
	Strong evidence “CrowdStrike (Nasdaq: CRWD), a global cybersecurity leader, has redefined modern security with the world’s most advanced cloud-native platform for protecting critical areas of…” Source: RevenueBase Database · checked Oct 1, 2026
6	Check Point Software	Indirect evidence	Redwood City, CA, United StatesHQ checked Oct 1, 2026	5,001-10,000	7,668 contacts →
	Indirect evidence “Check Point Software Technologies Ltd.” Source: RevenueBase Database · checked Oct 1, 2026
7	Hackerone	Indirect evidence	San Francisco, CA, United StatesHQ checked Oct 1, 2026	n/a	6,058 contacts →
	Indirect evidence “HackerOne is a global leader in Continuous Threat Exposure Management (CTEM) and the only solution provider that pairs the simultaneous trust of the Fortune 500 and the world's…” Source: RevenueBase Database · checked Oct 1, 2026
8	Cohesity	Indirect evidence	Santa Clara, CA, United StatesHQ checked Oct 1, 2026	1,001-5,000	4,962 contacts →
	Indirect evidence “A modern platform for the AI era Our mission at Cohesity is simple: to protect, secure, and provide insights into the world’s data.” Source: RevenueBase Database · checked Oct 1, 2026
9	Rubrik	Indirect evidence	Palo Alto, CA, United StatesHQ checked Oct 1, 2026	1,001-5,000	4,448 contacts →
	Indirect evidence “Rubrik (NYSE: RBRK), the Security and AI company, operates at the intersection of data protection, cyber resilience and enterprise AI acceleration.” Source: RevenueBase Database · checked Oct 1, 2026
10	Kaseya	Strong evidence	Miami, FL, United StatesHQ checked Oct 1, 2026	5,001-10,000	4,276 contacts →
	Strong evidence “Kaseya is the leading global provider of AI-powered IT management and cybersecurity software.” Source: RevenueBase Database · checked Oct 1, 2026
11	Commvault	Indirect evidence	Tinton Falls, NJ, United StatesHQ checked Oct 1, 2026	1,001-5,000	4,032 contacts →
	Indirect evidence “Commvault (NASDAQ: CVLT) is a leader in unified resilience at enterprise scale.” Source: RevenueBase Database · checked Oct 1, 2026
12	Bugcrowd	Indirect evidence	San Francisco, CA, United StatesHQ checked Oct 1, 2026	n/a	3,649 contacts →
	Indirect evidence “We are a crowdsourced security company that safeguards organizations' assets from sophisticated threat actors before they can strike-by uniting our customers with trusted hackers…” Source: RevenueBase Database · checked Oct 1, 2026
13	Trellix	Strong evidence	Plano, TX, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,447 contacts →
	Strong evidence “Trellix is a global cybersecurity company delivering intelligence-led cyber resilience for security-conscious organizations at any stage of their journey.” Source: RevenueBase Database · checked Oct 1, 2026
14	Quest Software	Indirect evidence	Austin, TX, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,206 contacts →
	Indirect evidence “At Quest Software, we help organizations build modern, trusted foundations for AI.” Source: RevenueBase Database · checked Oct 1, 2026
15	Arctic Wolf	Indirect evidence	Eden Prairie, MN, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,145 contacts →
	Indirect evidence “Every year new technologies, vendors, and solutions emerge-yet despite this constant innovation, high-profile breaches are all over the headlines.” Source: RevenueBase Database · checked Oct 1, 2026
16	Qualys	Indirect evidence	Foster City, CA, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,058 contacts →
	Indirect evidence “Qualys, Inc.(NASDAQ: QLYS) is a leading provider of disruptive cloud-based security, compliance and IT solutions with more than subscription customers worldwide, including a…” Source: RevenueBase Database · checked Oct 1, 2026
17	Netskope	Indirect evidence	Santa Clara, CA, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,056 contacts →
	Indirect evidence “Netskope (NASDAQ: NTSK), a leader in modern security and networking for the cloud and AI era, addresses the needs of both security and networking teams by providing optimized…” Source: RevenueBase Database · checked Oct 1, 2026
18	Sentinelone	Strong evidence	Mountain View, CA, United StatesHQ checked Oct 1, 2026	1,001-5,000	3,052 contacts →
	Strong evidence “SentinelOne is the world's leading AI-powered cybersecurity platform.” Source: RevenueBase Database · checked Oct 1, 2026
19	Entrust	Indirect evidence	Minneapolis, MN, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,907 contacts →
	Indirect evidence “Entrust fights fraud and cyber threats with identity-centric security that protects people, devices, and data.” Source: RevenueBase Database · checked Oct 1, 2026
20	Sailpoint	Indirect evidence	Austin, TX, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,886 contacts →
	Indirect evidence “SailPoint equips the modern enterprise to seamlessly manage and secure access to applications and data through the lens of identity – at speed and scale.” Source: RevenueBase Database · checked Oct 1, 2026
21	Rapid7	Strong evidence	Boston, MA, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,822 contacts →
	Strong evidence “Rapid7, Inc.(NASDAQ: RPD) is a global leader in AI-powered managed cybersecurity operations, trusted to advance organizations’ cyber resilience.” Source: RevenueBase Database · checked Oct 1, 2026
22	Infoblox	Indirect evidence	Santa Clara, CA, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,813 contacts →
	Indirect evidence “Infoblox unites networking and security to deliver unmatched performance and protection.” Source: RevenueBase Database · checked Oct 1, 2026
23	Varonis	Indirect evidence	Miami, FL, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,715 contacts →
	Indirect evidence “Varonis unifies AI-native data security, AI security and governance, and behavior-based threat detection.” Source: RevenueBase Database · checked Oct 1, 2026
24	Knowbe4	Indirect evidence	Clearwater, FL, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,367 contacts →
	Indirect evidence “KnowBe4 empowers the modern workforce to make smarter security decisions every day.” Source: RevenueBase Database · checked Oct 1, 2026
25	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Oct 1, 2026	1,001-5,000	2,222 contacts →
	Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Oct 1, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: cybersecurity companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names cybersecurity companies.
Partial evidence: Its own public description names part of cybersecurity companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 8,998 cybersecurity companies based in the United States

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Cybersecurity companies based in the United States at a glance

As of Oct 1, 2026

37.3%Verified-email coverage

50.5Average contacts per company

1-10Median size (employees)

4.0%Largest-city concentration · New York

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

4,682

11-50

2,893

51-200

964

201-500

234

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 8,998 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among cybersecurity companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “cybersecurity companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names cybersecurity companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among cybersecurity companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 169,513 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 1, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Cybersecurity companies by metro

Frequently asked

How many cybersecurity companies are in the directory?

The directory lists 8,998 cybersecurity companies based in the United States.

Which city has the most cybersecurity companies?

New York is the single most-represented city among the cybersecurity companies on the list.

How many contacts are available for cybersecurity companies?

The directory includes 454,413 professional contacts and 169,513 email addresses for the listed cybersecurity companies.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.