Company lists · Data refreshed September 2026

Top 25 Intrusion detection companies worldwide

Name: Intrusion detection companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,810 companies tracked

RevenueBase identified 1,810 intrusion detection companies worldwide as of September 2026 and tracks 80,896 professional contacts across them, including 36,459 with verified work emails. The United States is the largest market and London the largest hub.

This list covers intrusion detection 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 20, 2026. Country and city lists for intrusion detection 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 20, 2026 86% judged on-target in blind review

1,810Companies

80,896Contacts tracked

36,459Verified emails

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The 25 largest intrusion detection companies worldwide

Ranked by team size

Top 25 of 1,810 intrusion detection companies worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to intrusion detection 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, CA, United StatesHQ checked Sep 20, 2026	10001+	18,431 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 20, 2026
2	Fortinet	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 20, 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 Sep 20, 2026
3	Bugcrowd	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 20, 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 Sep 20, 2026
4	Sentinelone	Indirect evidence	Mountain View, CA, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,052 contacts →
	Indirect evidence “SentinelOne is the world's leading AI-powered cybersecurity platform.” Source: RevenueBase Database · checked Sep 20, 2026
5	Infoblox	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 20, 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 Sep 20, 2026
6	Bitdefender	Partial evidence	Bucuresti, RomaniaHQ checked Sep 20, 2026	1,001-5,000	2,172 contacts →
	Partial evidence “Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
7	Recorded Future	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	501-1,000	1,030 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
8	Zerofox	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 20, 2026	501-1,000	904 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 20, 2026
9	Exabeam	Indirect evidence	Broomfield, CO, United StatesHQ checked Sep 20, 2026	501-1,000	876 contacts →
	Indirect evidence “Exabeam is the leader in Behavior Intelligence for the agentic enterprise.” Source: RevenueBase Database · checked Sep 20, 2026
10	ALLOT	Indirect evidence	Hod-hasharon, IsraelHQ checked Sep 20, 2026	501-1,000	856 contacts →
	Indirect evidence “Allot Ltd.(NASDAQ: ALLT, TASE: ALLT) is a provider of leading innovative converged cybersecurity solutions and network intelligence for service providers and enterprises…” Source: RevenueBase Database · checked Sep 20, 2026
11	SISA	Partial evidence	Bengaluru, IndiaHQ checked Sep 20, 2026	201-500	743 contacts →
	Partial evidence “SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…” Source: RevenueBase Database · checked Sep 20, 2026
12	Extrahop	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	501-1,000	726 contacts →
	Indirect evidence “ExtraHop is a leader in real-time network intelligence, empowering organizations with the high-fidelity context they need to power security and IT AI automation, detect risks…” Source: RevenueBase Database · checked Sep 20, 2026
13	Huntress	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 20, 2026	501-1,000	696 contacts →
	Indirect evidence “Protect Your Endpoints, Identities, Logs, and Employees.” Source: RevenueBase Database · checked Sep 20, 2026
14	Vectra AI	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 20, 2026	501-1,000	651 contacts →
	Indirect evidence “Vectra AI is the cybersecurity AI leader in protecting modern networks from modern attacks.” Source: RevenueBase Database · checked Sep 20, 2026
15	SSH Communications Security	Indirect evidence	Helsinki, FinlandHQ checked Sep 20, 2026	51-200	593 contacts →
	Indirect evidence “We are a European cybersecurity company that helps businesses secure critical data and communications between systems, automated applications, and people with defensive…” Source: RevenueBase Database · checked Sep 20, 2026
16	Advens	Indirect evidence	Paris, ItalyHQ checked Sep 20, 2026	501-1,000	586 contacts →
	Indirect evidence “Advens is a European, independent and outstanding leader in cybersecurity.” Source: RevenueBase Database · checked Sep 20, 2026
17	Ahnlab, INC	Indirect evidence	Seongnam-si, South KoreaHQ checked Sep 20, 2026	1,001-5,000	581 contacts →
	Indirect evidence “Founded in 1995, AhnLab, Inc, the global cybersecurity company, delivers comprehensive protection for endpoints, networks, transactions, and essential services.” Source: RevenueBase Database · checked Sep 20, 2026
18	Group-Ib	Indirect evidence	SingaporeHQ checked Sep 20, 2026	501-1,000	528 contacts →
	Indirect evidence “Founded in 2003 and headquartered in Singapore, Group-IB is a leading creator of cybersecurity technologies to investigate, prevent, and fight digital crime.” Source: RevenueBase Database · checked Sep 20, 2026
19	G Data Cyberdefense	Indirect evidence	Bochum, GermanyHQ checked Sep 20, 2026	501-1,000	386 contacts →
	Indirect evidence “Progress is our motivation because we are convinced that it will lead us to a successful future – independent of industries, companies and social classes.” Source: RevenueBase Database · checked Sep 20, 2026
20	SK Shieldus	Indirect evidence	경기도, South KoreaHQ checked Sep 20, 2026	5,001-10,000	348 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
21	Sentar INC	Indirect evidence	Huntsville, AL, United StatesHQ checked Sep 20, 2026	201-500	338 contacts →
	Indirect evidence “Sentar, an employee-owned company, is a leading cyber-intelligence solutions provider focused on the National Security sector.” Source: RevenueBase Database · checked Sep 20, 2026
22	Gurucul	Indirect evidence	El Segundo, CA, United StatesHQ checked Sep 20, 2026	201-500	325 contacts →
	Indirect evidence “Gurucul is a security analytics company founded in data science that delivers radical clarity about cyber risk.” Source: RevenueBase Database · checked Sep 20, 2026
23	ONTIC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	201-500	317 contacts →
	Indirect evidence “At Ontic, you’ll join a team driven by collaboration, innovation, and a shared sense of purpose.” Source: RevenueBase Database · checked Sep 20, 2026
24	DEXIS	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 20, 2026	51-200	303 contacts →
	Indirect evidence “Dexis is a mission-driven security analytics company that helps U.S.” Source: RevenueBase Database · checked Sep 20, 2026
25	Sonitrol	Partial evidence	Indianapolis, United StatesHQ checked Sep 20, 2026	10001+	302 contacts →
	Partial evidence “Sonitrol is the industry leader in verified electronic security and provides customers with a single source of integrated security solutions for intrusion, video, access and fire.” Source: RevenueBase Database · checked Sep 20, 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: intrusion detection 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 intrusion detection companies.
Partial evidence: Its own public description names part of intrusion detection companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name intrusion detection 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 1,810 intrusion detection companies worldwide

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Intrusion detection companies worldwide at a glance

As of Sep 20, 2026

45.1%Verified-email coverage

44.7Average contacts per company

11-50Median size (employees)

2.1%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

774

11-50

642

51-200

247

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 intrusion detection 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: Every country. Country and city lists for intrusion detection companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “intrusion detection 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 intrusion detection 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 intrusion detection 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, 36,459 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 20, 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.

Intrusion detection companies by location

13 lists · largest first

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

Countries

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 intrusion detection 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 intrusion detection companies are there worldwide?

RevenueBase identified 1,810 intrusion detection 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 Santa Clara, tops this list with the largest team on record.

Which country has the most intrusion detection companies?

The United States leads with 491 companies, followed by India (119) and the United Kingdom (94). Every intrusion detection companies list by country and city is linked on this page.

Which city has the most intrusion detection companies?

London leads with 38 headquartered companies, followed by New York (19) and Sao Paulo (19).

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 36,459 verified decision-maker contacts tracked across these 1,810 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 20, 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.