Company lists · Data refreshed September 2026

Top 25 Website security companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 1,079 companies tracked

RevenueBase identified 1,079 website security companies headquartered in the United States as of September 2026 and tracks 13,054 professional contacts across them, including 4,843 with verified work emails. New York is the largest hub.

This list covers website security 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 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 Sep 14, 2026 86% judged on-target in blind review

1,079Companies

13,054Contacts tracked

4,843Verified emails

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The 25 largest website security companies based in the United States

Ranked by team size

Top 25 of 1,079 website security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to website security 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	Thales Cybersecurity Products	Indirect evidence	Austin, TX, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,252 contacts →
	Indirect 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 14, 2026
2	Trustwave, A Levelblue Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	501-1,000	874 contacts →
	Indirect evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 14, 2026
3	Comodo	Strong evidence	Bloomfield, NJ, United StatesHQ checked Sep 14, 2026	51-200	566 contacts →
	Strong evidence “Comodo - Protecting Your Digital World At Comodo, we are dedicated to safeguarding your digital property with Comodo Website Security.” Source: RevenueBase Database · checked Sep 14, 2026
4	Ultraviolet Cyber	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	501-1,000	523 contacts →
	Partial evidence “UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program, finding what's vulnerable, stopping…” Source: RevenueBase Database · checked Sep 14, 2026
5	Invicti	Indirect evidence	Austin, TX, United StatesHQ checked Sep 14, 2026	201-500	326 contacts →
	Indirect evidence “Invicti is transforming the way web applications are secured.” Source: RevenueBase Database · checked Sep 14, 2026
6	Loginsoft	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 14, 2026	201-500	220 contacts →
	Indirect evidence “For over 20 years, leading companies in Telecom, Cybersecurity, Healthcare, Banking, New Media, and more have come to rely on Loginsoft as a trusted resource for technology talent.” Source: RevenueBase Database · checked Sep 14, 2026
7	Mindpoint Group, A Quantum SKY Company	Indirect evidence	Reston, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	204 contacts →
	Indirect evidence “MindPoint Group, a Quantum Sky company, is a cybersecurity specialist trusted by U.S.” Source: RevenueBase Database · checked Sep 14, 2026
8	Webroot	Indirect evidence	Broomfield, CO, United StatesHQ checked Sep 14, 2026	501-1,000	199 contacts →
	Indirect evidence “Webroot, an OpenText company, was the first to harness the cloud and artificial intelligence to stop zero-day threats in real time.” Source: RevenueBase Database · checked Sep 14, 2026
9	Safeaeon INC	Partial evidence	Pleasanton, CA, United StatesHQ checked Sep 14, 2026	51-200	196 contacts →
	Partial evidence “SafeAeon leads the industry as a top-tier Cybersecurity-as-a-Service provider, delivering 24x7 premium Managed Security Services with AI-powered and human-driven 24x7 SOC…” Source: RevenueBase Database · checked Sep 14, 2026
10	Deepseas	Indirect evidence	Globally Distributed, United StatesHQ checked Sep 14, 2026	201-500	182 contacts →
	Indirect evidence “With 30 years of experience in cyber defense, DeepSeas is trusted by nearly clients around the world, including Fortune 100 enterprises and mid-market organizations, municipality…” Source: RevenueBase Database · checked Sep 14, 2026
11	Cypfer	Indirect evidence	Miami, FL, United StatesHQ checked Sep 14, 2026	51-200	178 contacts →
	Indirect evidence “Global Cyber Certainty Champions, in an uncertain digital world.” Source: RevenueBase Database · checked Sep 14, 2026
12	Cyber Advisors	Partial evidence	Maple Grove, MN, United StatesHQ checked Sep 14, 2026	201-500	176 contacts →
	Partial evidence “Cyber Advisors is a nationwide leader in cyber security, providing a comprehensive range of Offensive, Defensive, and Risk Management services.” Source: RevenueBase Database · checked Sep 14, 2026
13	Defendedge	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 14, 2026	51-200	167 contacts →
	Indirect evidence “DefendEdge is a leading US-based cybersecurity firm specializing in protecting clients' firewalls, endpoints, and applications against cyber threats and vulnerabilities.” Source: RevenueBase Database · checked Sep 14, 2026
14	Hitachi Cyber	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 14, 2026	501-1,000	159 contacts →
	Indirect evidence “Hitachi Systems Trusted Cyber Management Inc.” Source: RevenueBase Database · checked Sep 14, 2026
15	Nuharbor	Indirect evidence	Colchester, VT, United StatesHQ checked Sep 14, 2026	51-200	151 contacts →
	Indirect evidence “nuHarbor is a U.S-based cybersecurity firm trusted by public sector and critical infrastructure organizations nationwide.” Source: RevenueBase Database · checked Sep 14, 2026
16	Helpsystems	Indirect evidence	Eden Prairie, MN, United StatesHQ checked Sep 14, 2026	1,001-5,000	131 contacts →
	Indirect evidence “HelpSystems has long been known for helping organizations become more secure and autonomous.” Source: RevenueBase Database · checked Sep 14, 2026
17	Authentic8	Partial evidence	Redwood City, CA, United StatesHQ checked Sep 14, 2026	51-200	124 contacts →
	Partial evidence “Authentic8 helps intelligence and security teams investigate the digital world without exposing who they are, where they are, or what they are working on.” Source: RevenueBase Database · checked Sep 14, 2026
18	Tracesecurity	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 14, 2026	51-200	115 contacts →
	Partial evidence “TraceSecurity is a leading cybersecurity services company, providing a broad range of services and solutions in IT security compliance, risk and vulnerability management, and…” Source: RevenueBase Database · checked Sep 14, 2026
19	Directdefense	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	51-200	111 contacts →
	Partial evidence “DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: RevenueBase Database · checked Sep 14, 2026
20	Ioactive, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	51-200	107 contacts →
	Partial evidence “IOActive is a trusted partner for Global enterprises, providing research-fueled security services across all industries.” Source: RevenueBase Database · checked Sep 14, 2026
21	Foresite Cybersecurity	Indirect evidence	Overland Park, KS, United StatesHQ checked Sep 14, 2026	51-200	101 contacts →
	Indirect evidence “As the world becomes more connected, our lives and businesses are more vulnerable.” Source: RevenueBase Database · checked Sep 14, 2026
22	Sitelock	Strong evidence	Scottsdale, AZ, United StatesHQ checked Sep 14, 2026	201-500	87 contacts →
	Strong evidence “Join the Global Leader in Website Security – SiteLock!” Source: RevenueBase Database · checked Sep 14, 2026
23	Vertek Corporation	Indirect evidence	Burlington, VT, United StatesHQ checked Sep 14, 2026	51-200	81 contacts →
	Indirect evidence “At Vertek, we deliver advanced cybersecurity solutions that empower businesses to protect their digital assets and achieve peace of mind.” Source: RevenueBase Database · checked Sep 14, 2026
24	Techguard Security	Partial evidence	O'fallon, IL, United StatesHQ checked Sep 14, 2026	51-200	80 contacts →
	Partial evidence “Our Cybersecurity Specialists are highly educated and certified professionals who have utilized their extensive IT security experience to support both Fortune 500 businesses and…” Source: RevenueBase Database · checked Sep 14, 2026
25	Klik Solutions Managed It, Cybersecurity, Data&tech Solutions Partner Baltimore Austin Miami	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 14, 2026	11-50	79 contacts →
	Indirect evidence “Technology should push your business forward, not create friction, risk, or uncertainty.” Source: RevenueBase Database · checked Sep 14, 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: website security 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 website security companies.
Partial evidence: Its own public description names part of website security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name website security 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 1,079 website security companies based in the United States

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Website security companies based in the United States at a glance

As of Sep 14, 2026

37.1%Verified-email coverage

12.1Average contacts per company

1-10Median size (employees)

2.5%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

630

11-50

327

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 1,079 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 website security 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 “website security 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 website security 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 website security 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, 4,843 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 14, 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.

Website security companies by metro

Website security companies in New York27

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 website security companies, 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 website security companies are there based in the United States?

RevenueBase identified 1,079 website security companies 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?

Thales Cybersecurity Products, headquartered in Austin, tops this list with the largest team on record.

Which city has the most website security companies?

New York leads with 27 headquartered companies, followed by Austin (23) and Miami (23).

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 4,843 verified decision-maker contacts tracked across these 1,079 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 14, 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.