Company lists · Data refreshed September 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 Data refreshed Sep 1, 2026 5,836 companies tracked

RevenueBase identified 5,836 cybersecurity startups headquartered in the United States as of September 2026 and 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 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 RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

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 refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity startups: 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	Symantec	Partial evidence	San Jose, CA, United States	10001+	11,179 contacts →
	Partial evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Sep 1, 2026
2	Rubrik	Indirect evidence	Reston, VA, United States	1,001-5,000	4,381 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 Sep 1, 2026
3	Commvault	Indirect evidence	Tinton Falls, NJ, United States	1,001-5,000	4,050 contacts →
	Indirect evidence “Commvault (NASDAQ: CVLT) is a leader in unified resilience at enterprise scale.” Source: RevenueBase Database · checked Sep 1, 2026
4	Trellix	Partial evidence	Plano, TX, United States	1,001-5,000	3,490 contacts →
	Partial 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 Sep 1, 2026
5	Sentinelone	Partial evidence	Mountain View, CA, United States	1,001-5,000	3,046 contacts →
	Partial evidence “SentinelOne is the world's leading AI-powered cybersecurity platform.” Source: RevenueBase Database · checked Sep 1, 2026
6	Qualys	Indirect evidence	Foster City, CA, United States	1,001-5,000	3,042 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 Sep 1, 2026
7	Ivanti	Indirect evidence	San Jose, United States	1,001-5,000	2,666 contacts →
	Indirect evidence “Ivanti is a global enterprise IT and security software company dedicated to unlocking human potential by managing, automating and protecting data and systems to empower continuous…” Source: RevenueBase Database · checked Sep 1, 2026
8	OPTIV	Indirect evidence	Chantilly, VA, United States	1,001-5,000	2,206 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 Sep 1, 2026
9	Tenable	Partial evidence	Columbia, MD, United States	1,001-5,000	2,158 contacts →
	Partial evidence “Tenable is the exposure management company, exposing and closing the cybersecurity gaps that erode business value, reputation and trust.” Source: RevenueBase Database · checked Sep 1, 2026
10	Bitdefender	Partial evidence	Fort Lauderdale, FL, United States	1,001-5,000	2,141 contacts →
	Partial evidence “Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide.” Source: RevenueBase Database · checked Sep 1, 2026
11	Barracuda	Partial evidence	Alpharetta, GA, United States	1,001-5,000	2,108 contacts →
	Partial evidence “Barracuda is a leading global cybersecurity company providing complete protection against complex threats for all size business.” Source: RevenueBase Database · checked Sep 1, 2026
12	Acronis	Partial evidence	Burlington, MA, United States	1,001-5,000	2,081 contacts →
	Partial evidence “Acronis is a global cyber protection company delivering the only natively integrated cybersecurity, data protection, and infrastructure management platform for managed service…” Source: RevenueBase Database · checked Sep 1, 2026
13	Beyondtrust	Partial evidence	Johns Creek, GA, United States	1,001-5,000	1,650 contacts →
	Partial evidence “BeyondTrust is the global cybersecurity leader protecting Paths to Privilege™.” Source: RevenueBase Database · checked Sep 1, 2026
14	Fortra	Partial evidence	Eden Prairie, MN, United States	1,001-5,000	1,640 contacts →
	Partial evidence “Fortra delivers AI-amplified cybersecurity solutions that help organizations use and protect data with confidence.” Source: RevenueBase Database · checked Sep 1, 2026
15	Reliaquest	Indirect evidence	Sandy, UT, United States	1,001-5,000	1,252 contacts →
	Indirect evidence “ReliaQuest exists to Make Security Possible.” Source: RevenueBase Database · checked Sep 1, 2026
16	Thales Cybersecurity Products	Partial evidence	Austin, TX, United States	1,001-5,000	1,252 contacts →
	Partial evidence “Thales is a global leader in cybersecurity, helping the most trusted organizations in the world protect their most critical applications, data, and identities anywhere at scale.” Source: RevenueBase Database · checked Sep 1, 2026
17	Guidepoint Security	Partial evidence	Tampa, FL, United States	1,001-5,000	1,234 contacts →
	Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 1, 2026
18	Imperva	Indirect evidence	Austin, TX, United States	10001+	1,211 contacts →
	Indirect evidence “On Dec.” Source: RevenueBase Database · checked Sep 1, 2026
19	Forescout Technologies INC	Indirect evidence	San Jose, CA, United States	1,001-5,000	1,165 contacts →
	Indirect evidence “As AI-driven vulnerability and exploitation accelerate attack velocity to machine speed, Forescout is a foundational cyber defense layer that allows organizations to segment and…” Source: RevenueBase Database · checked Sep 1, 2026
20	Watchguard Technologies	Indirect evidence	Seattle, WA, United States	1,001-5,000	1,054 contacts →
	Indirect evidence “WatchGuard® Technologies, Inc.” Source: RevenueBase Database · checked Sep 1, 2026
21	Netenrich	Indirect evidence	San Jose, CA, United States	501-1,000	885 contacts →
	Indirect evidence “Netenrich is redefining security operations by shifting the focus from "efficiency"(speed) to "efficacy"(comprehensive coverage).” Source: RevenueBase Database · checked Sep 1, 2026
22	Absolute Security	Indirect evidence	Seattle, WA, United States	501-1,000	789 contacts →
	Indirect evidence “Absolute Security is partnered with more than 28 of the world’s leading endpoint device manufacturers, embedded in the firmware of 600 million devices, trusted by global…” Source: RevenueBase Database · checked Sep 1, 2026
23	Threatlocker	Indirect evidence	Orlando, FL, United States	501-1,000	725 contacts →
	Indirect evidence “The ThreatLocker® story.” Source: RevenueBase Database · checked Sep 1, 2026
24	Coalition, INC	Indirect evidence	San Francisco, CA, United States	501-1,000	719 contacts →
	Indirect evidence “Coalition is the world's first Active Insurance provider designed to help prevent digital risk before it strikes.” Source: RevenueBase Database · checked Sep 1, 2026
25	Huntress	Indirect evidence	Columbia, MD, United States	501-1,000	694 contacts →
	Indirect evidence “Protect Your Endpoints, Identities, Logs, and Employees.” Source: RevenueBase Database · checked Sep 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 startups. 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 startups.
Partial evidence: Its own public description names part of cybersecurity startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity startups. 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 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 Sep 1, 2026

43.7%Verified-email coverage

30.4%Mobile-number coverage

26.1Average contacts per company

1-10Median size (employees)

3.9%Largest-city concentration · New York

Sep 1, 2026Page data refreshed

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+

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 startups, 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 startups”. 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 startups), 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 startups, 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, 66,521 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 September 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 startups by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its 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 the category the list is about. Each row is rated strong evidence when the company's own description names cybersecurity startups, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many cybersecurity startups are there based in the United States?

RevenueBase identified 5,836 cybersecurity startups headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

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 refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 2026.

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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.