Company lists · Data refreshed September 2026

Top 22 Information security companies based in Ireland

Name: Information security companies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 70 companies tracked

RevenueBase identified 70 information security companies headquartered in Ireland as of September 2026 and tracks 1,164 professional contacts across them, including 571 with verified work emails and 51 with mobile numbers. Dublin is the largest hub.

This list covers information security companies headquartered in Ireland, 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

70Companies

1,164Contacts tracked

571Verified emails

51Mobile numbers

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The 22 largest information security companies based in Ireland

Ranked by team size

Top 22 of 70 information security companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names information security companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	NostraPartial evidence	Dublin 12, IrelandHQ checked Sep 3, 2026	201-500	286
	“Nostra was established in 2006 and in that time has become one of Ireland’s most trusted providers of Managed IT and Cyber Security Services for a wide range of sectors.” Source: company website · checked Sep 3, 2026
2	Smarttech247Indirect evidence	Belfast, IrelandHQ checked Sep 3, 2026	51-200	188
	“At Smarttech247 we help global companies defend against cyber crime and protect their operations.” Source: company website · checked Sep 3, 2026
3	BH ConsultingIndirect evidence	Blanchardstown, IrelandHQ checked Sep 3, 2026	11-50	81
	“BH Consulting is an independent consulting firm in operation since 2004.” Source: company website · checked Sep 3, 2026
4	Trend Micro EuropeIndirect evidence	Cork, IrelandHQ checked Sep 3, 2026	5,001-10,000	76
	Source: company website · checked Sep 3, 2026
5	ThreatscapePartial evidence	Dublin, IrelandHQ checked Sep 3, 2026	11-50	38
	“We are a pure play IT security company, which allows us to focus solely on protecting your business from cyber threats.” Source: company website · checked Sep 3, 2026
6	ParadynPartial evidence	Sandyford, IrelandHQ checked Sep 3, 2026	51-200	28
	“Paradyn is a leading provider of IT security and consultancy services in Ireland, offering a comprehensive, best-in-class suite of security services to monitor, protect and defend…” Source: company website · checked Sep 3, 2026
7	Commsec Cyber SecurityPartial evidence	IrelandHQ checked Sep 3, 2026	11-50	22
	“CommSec is an Irish cyber security company helping organisations protect their systems, data, and operations against modern cyber threats.” Source: company website · checked Sep 3, 2026
8	WhatsexposedPartial evidence	Castlebar, IrelandHQ checked Sep 3, 2026	11-50	20
	“CREST-certified offensive security and continuous exposure management, delivered through a single SaaS platform.” Source: company website · checked Sep 3, 2026
9	Exclusive Networks IrelandIndirect evidence	Citywest, IrelandHQ checked Sep 3, 2026	11-50	16
	“Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Source: company website · checked Sep 3, 2026
10	ATOROIndirect evidence	IrelandHQ checked Sep 3, 2026	11-50	13
	“Atoro is a global team of elite cybersecurity consultants, cloud architects, engineers and CISOs with a singular ambition: to help emerging businesses safeguard their data…” Source: company website · checked Sep 3, 2026
11	PenteorIndirect evidence	Rathcoole, IrelandHQ checked Sep 3, 2026	11-50	12
	“Our aim is to help organizations defend against cyber-attacks by finding their vulnerabilities in a proactive manner.” Source: company website · checked Sep 3, 2026
12	Ward SolutionsStrong evidence	IrelandHQ checked Sep 3, 2026	51-200	11
	“Ward Solutions is Ireland’s largest Information Security provider.” Source: company website · checked Sep 3, 2026
13	Enterprise DefencePartial evidence	Sligo, IrelandHQ checked Sep 3, 2026	11-50	10
	“Enterprise Defence are an award winning team of cyber security specialists.” Source: company website · checked Sep 3, 2026
14	Intercept TechnologiesIndirect evidence	Dublin, IrelandHQ checked Sep 3, 2026	1-10	8
	“Intercept Technologies, the game-changer in advanced monitoring and state-of-the-art tooling, offering unparalleled identification and remediation of potential exposures and…” Source: company website · checked Sep 3, 2026
15	Secora Consulting LTDIndirect evidence	Stranorlar, IrelandHQ checked Sep 3, 2026	1-10	7
	“Secora Consulting are experts in cybersecurity and risk mitigation.” Source: company website · checked Sep 3, 2026
16	CyberhealthIndirect evidence	Dublin, IrelandHQ checked Sep 3, 2026	1-10	7
	“At Cyberhealth, we specialise in providing cost-effective cybersecurity services tailored specifically for small to medium-sized businesses (SMBs).” Source: company website · checked Sep 3, 2026
17	Leacam Technology Consulting LTDPartial evidence	Dublin, IrelandHQ checked Sep 3, 2026	1-10	7
	“Leacam offers security-first IT support services that help protect your business, minimise the number and severity of security incidents, and reduces your overall IT costs.” Source: company website · checked Sep 3, 2026
18	Netfocus IT SolutionsIndirect evidence	Naas, IrelandHQ checked Sep 3, 2026	1-10	5
	“Netfocus IT Solutions provides a comprehensive range of managed IT and cybersecurity services, supporting businesses in maintaining system uptime, safeguarding data, and enhancing…” Source: company website · checked Sep 3, 2026
19	NOVIPartial evidence	Naas, IrelandHQ checked Sep 3, 2026	11-50	5
	“Novi delivers security-oriented IT services that reduce risk and enable growth.” Source: company website · checked Sep 3, 2026
20	Integrity360 EuropeIndirect evidence	IrelandHQ checked Sep 3, 2026	201-500	4
	“Advantio, was acquired by Integrity360 in July 2023.” Source: company website · checked Sep 3, 2026
21	SecuricentrixIndirect evidence	Dublin, IrelandHQ checked Sep 3, 2026	1-10	4
	“Attackers already know what's in your environment.” Source: company website · checked Sep 3, 2026
22	IT Security PeoplePartial evidence	Skehanagh Clarecastle, IrelandHQ checked Sep 3, 2026	1-10	4
	“IT Security People Ltd was set up in response to the surge in Cybercrime exploits and IT Security threats in the Irish market.” Source: company website · checked Sep 3, 2026

Showing 22 of 70 information security companies based in Ireland

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Information security companies based in Ireland at a glance

As of Sep 3, 2026

1-10Median size (employees)

DublinLargest hub · 20 HQs

51Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

5,001-10,000

Verified emails by last verification

0–30

31–60

61–90

314

90–180

198

180+

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 information security companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Ireland whose own description of what they do matches “information security companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among information security companies, and records with no verified work email. Companies headquartered outside Ireland 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 an evidence 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, 571 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 3, 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.

Frequently asked

How many information security companies are there based in Ireland?

RevenueBase identified 70 information security companies headquartered in Ireland 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?

Nostra, headquartered in Dublin, tops this list with the largest team on record.

Which city has the most information security companies?

Dublin leads with 20 headquartered companies, followed by Cork (3) and Belfast (2).

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 571 verified decision-maker contacts tracked across these 70 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 3, 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 SmartSearch, 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.