Company lists · Data refreshed September 2026

Top 25 IT security companies worldwide

Name: IT security companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 18,856 companies tracked

RevenueBase identified 18,856 IT security companies worldwide as of September 2026 and tracks 348,356 professional contacts across them, including 129,876 with verified work emails and 55,973 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers IT security companies worldwide, 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 4, 2026. Country and city lists for IT security companies follow the table.

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 4, 2026 86% judged on-target in blind review

18,856Companies

348,356Contacts tracked

129,876Verified emails

55,973Mobile numbers

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The 25 largest IT security companies worldwide

Ranked by team size

Top 25 of 18,856 IT security companies worldwide, ranked by team size, largest first. Data refreshed Sep 4, 2026. RevenueBase Smart Search rates how each company's information relates to IT 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	Palo Alto Networks	Indirect evidence	Santa Clara, United StatesHQ checked Sep 4, 2026	10001+	18,430 contacts →
	Indirect 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 Sep 4, 2026
2	Fortinet	Indirect evidence	Sunnyvale, ON, United StatesHQ checked Sep 4, 2026	10001+	14,326 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 Sep 4, 2026
3	Symantec	Partial evidence	San Jose, CA, United StatesHQ checked Sep 4, 2026	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 4, 2026
4	Crowdstrike	Partial evidence	Remote, United StatesHQ checked Sep 4, 2026	5,001-10,000	10,059 contacts →
	Partial 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 Sep 4, 2026
5	Sophos	Indirect evidence	Abingdon, United KingdomHQ checked Sep 4, 2026	5,001-10,000	4,963 contacts →
	Indirect evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Sep 4, 2026
6	Trend Micro	Indirect evidence	Yoyogi, JapanHQ checked Sep 4, 2026	5,001-10,000	4,942 contacts →
	Indirect evidence “We’re a global cybersecurity leader, helping to make the world safe for exchanging digital information.” Source: RevenueBase Database · checked Sep 4, 2026
7	Orange Cyberdefense	Indirect evidence	Nanterre, FranceHQ checked Sep 4, 2026	1,001-5,000	3,706 contacts →
	Indirect evidence “Orange Cyberdefense is the expert cybersecurity business unit of the Orange Group.” Source: RevenueBase Database · checked Sep 4, 2026
8	Bugcrowd	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 4, 2026	n/a	3,566 contacts →
	Partial 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 Sep 4, 2026
9	Trellix	Partial evidence	Plano, TX, United StatesHQ checked Sep 4, 2026	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 4, 2026
10	Arctic Wolf	Indirect evidence	Eden Prairie, ON, United StatesHQ checked Sep 4, 2026	1,001-5,000	3,200 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 Sep 4, 2026
11	Sentinelone	Indirect evidence	Mountain View, CA, United StatesHQ checked Sep 4, 2026	1,001-5,000	3,046 contacts →
	Indirect evidence “SentinelOne is the world's leading AI-powered cybersecurity platform.” Source: RevenueBase Database · checked Sep 4, 2026
12	Darktrace	Indirect evidence	Cambridge, United KingdomHQ checked Sep 4, 2026	1,001-5,000	2,590 contacts →
	Indirect evidence “Darktrace is a global leader in AI cybersecurity, providing the essential cybersecurity platform to secure organizations today and for an ever-changing future.” Source: RevenueBase Database · checked Sep 4, 2026
13	OPTIV	Indirect evidence	Leawood, VA, United StatesHQ checked Sep 4, 2026	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 4, 2026
14	Bitdefender	Indirect evidence	Bucuresti, FL, RomaniaHQ checked Sep 4, 2026	1,001-5,000	2,141 contacts →
	Indirect evidence “Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide.” Source: RevenueBase Database · checked Sep 4, 2026
15	Barracuda	Indirect evidence	Campbell, GA, United StatesHQ checked Sep 4, 2026	1,001-5,000	2,108 contacts →
	Indirect evidence “Barracuda is a leading global cybersecurity company providing complete protection against complex threats for all size business.” Source: RevenueBase Database · checked Sep 4, 2026
16	Inspira Enterprise	Indirect evidence	Mumbai, IndiaHQ checked Sep 4, 2026	1,001-5,000	1,773 contacts →
	Indirect evidence “Inspira Enterprise is a global Cybersecurity & Data Analytics & AI services provider with a presence in North America, ASEAN, Middle East, India, and Africa regions.” Source: RevenueBase Database · checked Sep 4, 2026
17	Fortra	Indirect evidence	Eden Prairie, MN, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,640 contacts →
	Indirect evidence “Fortra delivers AI-amplified cybersecurity solutions that help organizations use and protect data with confidence.” Source: RevenueBase Database · checked Sep 4, 2026
18	Site سايت	Indirect evidence	Al Nakheel, Saudi ArabiaHQ checked Sep 4, 2026	501-1,000	1,378 contacts →
	Indirect evidence “We are established for enriching local content in designing, developing, and operating secure digital computing environments through Saudi talents, by fulfilling our role as a…” Source: RevenueBase Database · checked Sep 4, 2026
19	Thales Cybersecurity Products	Indirect evidence	Austin, TX, United StatesHQ checked Sep 4, 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 4, 2026
20	Guidepoint Security	Partial evidence	Reston, FL, United StatesHQ checked Sep 4, 2026	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 4, 2026
21	Imperva	Indirect evidence	Austin, TX, United StatesHQ checked Sep 4, 2026	10001+	1,211 contacts →
	Indirect evidence “On Dec.” Source: RevenueBase Database · checked Sep 4, 2026
22	Irdeto	Indirect evidence	Hoofddorp, NetherlandsHQ checked Sep 4, 2026	1,001-5,000	1,062 contacts →
	Indirect evidence “Irdeto is the world leader in digital platform cybersecurity, empowering businesses to innovate for a secure, connected future.” Source: RevenueBase Database · checked Sep 4, 2026
23	Watchguard Technologies	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 4, 2026	1,001-5,000	1,054 contacts →
	Indirect evidence “WatchGuard® Technologies, Inc.” Source: RevenueBase Database · checked Sep 4, 2026
24	Coalfire	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 4, 2026	1,001-5,000	960 contacts →
	Indirect evidence “Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Source: RevenueBase Database · checked Sep 4, 2026
25	Zerofox	Indirect evidence	Baltimore, United StatesHQ checked Sep 4, 2026	501-1,000	894 contacts →
	Indirect evidence “ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Source: RevenueBase Database · checked Sep 4, 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: IT 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 IT security companies.
Partial evidence: Its own public description names part of IT security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT 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 18,856 IT security companies worldwide

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IT security companies worldwide at a glance

As of Sep 4, 2026

37.3%Verified-email coverage

16.1%Mobile-number coverage

18.5Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · London

Sep 4, 2026Page data refreshed

Companies by employee count

1-10

10,017

11-50

6,451

51-200

1,702

201-500

362

501-1,000

111

1,001-5,000

104

5,001-10,000

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 IT 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.
Coverage: 65 countries, largest first: the United States, India, the United Kingdom, Canada, Brazil, France, Australia, Germany, Spain, the Netherlands and 55 more. Country and city lists for IT security companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “IT 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 IT 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 IT security companies, and records with no verified work email.
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, 129,876 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 between September 4, 2026 and 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.

IT security companies by location

150 lists · largest first

Every IT security companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 IT 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 IT security companies are there worldwide?

RevenueBase identified 18,856 IT security companies worldwide 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?

Palo Alto Networks, headquartered in He, tops this list with the largest team on record.

Which country has the most IT security companies?

The United States leads with 5,707 companies, followed by India (1,824) and the United Kingdom (1,365). Every IT security companies list by country and city is linked on this page.

Which city has the most IT security companies?

London leads with 522 headquartered companies, followed by Sao Paulo (236) and Dubai (220).

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 129,876 verified decision-maker contacts tracked across these 18,856 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 4, 2026 and 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.