Company lists · Data refreshed September 2026

Top 25 Managed security companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 79 companies tracked

RevenueBase identified 79 managed security companies headquartered in Ireland as of September 2026 and tracks 2,547 professional contacts across them, including 798 with verified work emails. Dublin is the largest hub.

This list covers managed 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 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 21, 2026 86% judged on-target in blind review

79Companies

2,547Contacts tracked

798Verified emails

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The 25 largest managed security companies based in Ireland

Ranked by team size

Top 25 of 79 managed security companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to managed 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	Viatel Technology Group	Strong evidence	Dublin 12, IrelandHQ checked Sep 21, 2026	201-500	335 contacts →
	Strong evidence “We deliver fully managed security, networking, cloud and communications services designed to drive enterprise.” Source: RevenueBase Database · checked Sep 21, 2026
2	Nostra	Strong evidence	Dublin 12, IrelandHQ checked Sep 21, 2026	201-500	288 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 21, 2026
3	Manguard Plus	Partial evidence	Naas, IrelandHQ checked Sep 21, 2026	501-1,000	213 contacts →
	Partial evidence “4-Time OSPA Winners (Outstanding Contract Security Company) 2022 - 2025 Manguard Plus is a privately owned, Irish Security company focused exclusively on the provision of Manned…” Source: RevenueBase Database · checked Sep 21, 2026
4	CSC	Indirect evidence	Unit W6a, IrelandHQ checked Sep 21, 2026	n/a	167 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
5	Sharp Group Fire & Security Services	Partial evidence	Rathcoole, IrelandHQ checked Sep 21, 2026	51-200	79 contacts →
	Partial evidence “The only security system to have ISO37001 - anti bribery and corruption and the first to obtain ISO27001 - cyber security.” Source: RevenueBase Database · checked Sep 21, 2026
6	Titanhq	Indirect evidence	Galway, IrelandHQ checked Sep 21, 2026	51-200	77 contacts →
	Indirect evidence “TitanHQ and Redstor have merged to launch CyberSentriq, a cybersecurity champion built for MSPs and their customers.” Source: RevenueBase Database · checked Sep 21, 2026
7	TOP Security Group	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	501-1,000	67 contacts →
	Partial evidence “From modest beginnings in 1979 Top Security has grown to become one of Ireland’s leading providers of security services and products.” Source: RevenueBase Database · checked Sep 21, 2026
8	Secureism	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	65 contacts →
	Indirect evidence “Secureism is founded by the brains who were awarded for their contribution to secure the cyber space on national as well as international level.” Source: RevenueBase Database · checked Sep 21, 2026
9	Pulse Security Management	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	201-500	53 contacts →
	Partial evidence “Provider of high end security services to the private & public sectors offering services in the following.” Source: RevenueBase Database · checked Sep 21, 2026
10	Action24ireland	Partial evidence	Dublin 18, IrelandHQ checked Sep 21, 2026	51-200	40 contacts →
	Partial evidence “At Action24 we have been delivering intelligent security solutions for over 40 years.” Source: RevenueBase Database · checked Sep 21, 2026
11	Threatscape	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	36 contacts →
	Partial evidence “We are a pure play IT security company, which allows us to focus solely on protecting your business from cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
12	Paradyn	Partial evidence	Sandyford, IrelandHQ checked Sep 21, 2026	51-200	27 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
13	Commsec Cyber Security	Partial evidence	Blanchardstown, IrelandHQ checked Sep 21, 2026	11-50	21 contacts →
	Partial evidence “CommSec is an Irish cyber security company helping organisations protect their systems, data, and operations against modern cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
14	Secure Management Solutions LTD	Strong evidence	Dublin 24, IrelandHQ checked Sep 21, 2026	51-200	18 contacts →
	Strong evidence “Secure Management Solutions (SMS) is a security company founded by highly experienced security company managers with 80 years of experience together.” Source: RevenueBase Database · checked Sep 21, 2026
15	Cytidel	Partial evidence	Castlebar, IrelandHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “Cytidel helps security teams cut through the noise and focus on the vulnerabilities that actually matter.” Source: RevenueBase Database · checked Sep 21, 2026
16	Taskforce Security Management Services	Strong evidence	Leinster, IrelandHQ checked Sep 21, 2026	51-200	16 contacts →
	Strong evidence “Taskforce Security Management Services is a pioneering start-up that has emerged as a leader in the field of security services in Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
17	Iping IT Services	Partial evidence	Dublin 2, IrelandHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “Some of iPing's services - Tel: 01 524 1350 Managed Services The implementation of managed services in your network is an important piece in your overall network design.” Source: RevenueBase Database · checked Sep 21, 2026
18	Celtic Security And Facilities Solutions	Partial evidence	Cappoge, IrelandHQ checked Sep 21, 2026	201-500	13 contacts →
	Partial evidence “We provide excellence and attention to detail in domestic and commercial security all over Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
19	ATORO	Indirect evidence	Portarlington, IrelandHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “Atoro is a cyber compliance consultancy for scaling software companies, and Europe's first ISO 42001 certified consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
20	Hybrid Technology Partners	Indirect evidence	Limerick, IrelandHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “Protecting operations.” Source: RevenueBase Database · checked Sep 21, 2026
21	Ward Solutions	Partial evidence	IrelandHQ checked Sep 21, 2026	51-200	11 contacts →
	Partial evidence “Ward Solutions is Ireland’s largest Information Security provider.” Source: RevenueBase Database · checked Sep 21, 2026
22	Stryve Secure - The Cyber	Strong evidence	Galway, IrelandHQ checked Sep 21, 2026	201-500	11 contacts →
	Strong evidence “Sleepless provides security-first IT-managed services to support your operations, secure your data and enable digital transformation to empower your business.” Source: RevenueBase Database · checked Sep 21, 2026
23	Enterprise Defence	Partial evidence	Sligo, IrelandHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “Enterprise Defence are an award winning team of cyber security specialists.” Source: RevenueBase Database · checked Sep 21, 2026
24	Ktech Security & Property Services	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	9 contacts →
	Indirect evidence “We offer a comprehensive service to determine the best solution for your requirements.” Source: RevenueBase Database · checked Sep 21, 2026
25	Netwatch Ireland & UK	Indirect evidence	Carlow, IrelandHQ checked Sep 21, 2026	501-1,000	8 contacts →
	Indirect evidence “Netwatch Proactive Video Monitoring (PVM) provides live, remote monitoring and expert intervention services to protect client sites.” Source: RevenueBase Database · checked Sep 21, 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: managed 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 managed security companies.
Partial evidence: Its own public description names part of managed security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name managed 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 79 managed security companies based in Ireland

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Managed security companies based in Ireland at a glance

As of Sep 21, 2026

31.3%Verified-email coverage

32.2Average contacts per company

11-50Median size (employees)

35.4%Largest-city concentration · Dublin

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Email recency for this list is measured worldwide rather than for Ireland, so it is reported there. Company counts and contact totals on this page are exact for Ireland, over 79 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 managed 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 Ireland whose own description of what they do matches “managed 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 managed 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 managed 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 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, 798 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 21, 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.

Managed security companies by metro

Managed security companies in Dublin28

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 managed 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 managed security companies are there based in Ireland?

RevenueBase identified 79 managed 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?

Viatel Technology Group, headquartered in Ireland, tops this list with the largest team on record.

Which city has the most managed security companies?

Dublin leads with 28 headquartered companies, followed by Naas (6) and Galway (3).

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 798 verified decision-maker contacts tracked across these 79 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 21, 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.