Company lists · Data refreshed September 2026

Top 25 Managed security service providers based in Ireland

RevenueBase identified 80 managed security service providers headquartered in Ireland as of September 2026 and tracks 1,521 professional contacts across them, including 662 with verified work emails and 87 with mobile numbers. Dublin is the largest hub.

This list covers managed security service providers 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 5, 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 5, 2026 86% judged on-target in blind review
80Companies
1,521Contacts tracked
662Verified emails
87Mobile numbers
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The 25 largest managed security service providers based in Ireland

Ranked by team size
Top 25 of 80 managed security service providers based in Ireland, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names managed security service providers: 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.
#CompanyHeadquartersEmployeesContacts
1
NostraStrong evidence
Dublin 12, IrelandHQ checked Sep 5, 2026201-500288

“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 5, 2026
2
BH ConsultingIndirect evidence
Dublin, IrelandHQ checked Sep 5, 202611-5081

“BH Consulting is an independent consulting firm in operation since 2004.”

Source: company website · checked Sep 5, 2026
3
TitanhqIndirect evidence
Galway, IrelandHQ checked Sep 5, 202651-20077

“TitanHQ and Redstor have merged to launch CyberSentriq, a cybersecurity champion built for MSPs and their customers.”

Source: company website · checked Sep 5, 2026
4
Trend Micro EuropeIndirect evidence
Cork, IrelandHQ checked Sep 5, 20265,001-10,00075
Source: company website · checked Sep 5, 2026
5
SecureismIndirect evidence
Dublin, IrelandHQ checked Sep 5, 202611-5065

“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: company website · checked Sep 5, 2026
6
ThreatscapePartial evidence
Dublin, IrelandHQ checked Sep 5, 202611-5036

“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 5, 2026
7
Evad Technology GroupPartial evidence
Dublin, IrelandHQ checked Sep 5, 202651-20034

“Founded in 2008, EVAD Technology Group delivers Zero‑Trust IT managed services across Ireland, the UK, Europe, Asia and Africa, specialising in cloud solutions, cybersecurity…”

Source: company website · checked Sep 5, 2026
8
ParadynPartial evidence
Sandyford, IrelandHQ checked Sep 5, 202651-20027

“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 5, 2026
9
Commsec Cyber SecurityPartial evidence
Blanchardstown, IrelandHQ checked Sep 5, 202611-5021

“CommSec is an Irish cyber security company helping organisations protect their systems, data, and operations against modern cyber threats.”

Source: company website · checked Sep 5, 2026
10
WhatsexposedStrong evidence
Castlebar, IrelandHQ checked Sep 5, 202611-5020

“CREST-certified offensive security and continuous exposure management, delivered through a single SaaS platform.”

Source: company website · checked Sep 5, 2026
11
CytidelPartial evidence
Castlebar, IrelandHQ checked Sep 5, 202611-5016

“Cytidel helps security teams cut through the noise and focus on the vulnerabilities that actually matter.”

Source: company website · checked Sep 5, 2026
12
Exclusive Networks IrelandIndirect evidence
Citywest, IrelandHQ checked Sep 5, 202611-5015

“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 5, 2026
13
Viso Cyber SecurityPartial evidence
Dublin, IrelandHQ checked Sep 5, 202611-5015

“We Simplify Cyber Security.”

Source: company website · checked Sep 5, 2026
14
DiacomPartial evidence
Dublin, IrelandHQ checked Sep 5, 202651-20014

“Diacom is an all-encompassing Managed Service Provider in the areas of IT, Networking, Cybersecurity, Telecoms, AV and Cloud.”

Source: company website · checked Sep 5, 2026
15
Iping IT ServicesPartial evidence
Dublin 2, IrelandHQ checked Sep 5, 20261-1014

“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: company website · checked Sep 5, 2026
16
ATOROIndirect evidence
Portarlington, IrelandHQ checked Sep 5, 202611-5013

“Atoro is a cyber compliance consultancy for scaling software companies, and Europe's first ISO 42001 certified consultancy.”

Source: company website · checked Sep 5, 2026
17
PenteorIndirect evidence
Dublin, IrelandHQ checked Sep 5, 202611-5012

“Our aim is to help organizations defend against cyber-attacks by finding their vulnerabilities in a proactive manner.”

Source: company website · checked Sep 5, 2026
18
Ward SolutionsPartial evidence
IrelandHQ checked Sep 5, 202651-20011

“Ward Solutions is Ireland’s largest Information Security provider.”

Source: company website · checked Sep 5, 2026
19
Enterprise DefencePartial evidence
Sligo, IrelandHQ checked Sep 5, 202611-5010

“Enterprise Defence are an award winning team of cyber security specialists.”

Source: company website · checked Sep 5, 2026
20
DefinitiveStrong evidence
Swords, IrelandHQ checked Sep 5, 202611-509

“Definitive Solutions Limited was established in to provide a comprehensive outsourced IT Managed Services nationwide (specialising in security) tailored to our clients’ specific…”

Source: company website · checked Sep 5, 2026
21Dublin, IrelandHQ checked Sep 5, 202611-508

“We help IT teams reduce complexity and risk by designing and operating networks where security is built in, not bolted on.”

Source: company website · checked Sep 5, 2026
22
Intercept TechnologiesIndirect evidence
Dublin 2, IrelandHQ checked Sep 5, 20261-108

“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 5, 2026
23
Secora Consulting LTDIndirect evidence
Stranorlar, IrelandHQ checked Sep 5, 20261-107

“Secora Consulting are experts in cybersecurity and risk mitigation.”

Source: company website · checked Sep 5, 2026
24
CyberhealthIndirect evidence
Dublin, IrelandHQ checked Sep 5, 20261-107

“At Cyberhealth, we specialise in providing cost-effective cybersecurity services tailored specifically for small to medium-sized businesses (SMBs).”

Source: company website · checked Sep 5, 2026
25Dublin, IrelandHQ checked Sep 5, 20261-107

“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 5, 2026

Showing 25 of 80 managed security service providers based in Ireland

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Managed security service providers based in Ireland at a glance

As of Sep 5, 2026
1-10Median size (employees)
DublinLargest hub · 27 HQs
87Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
42
11-50
24
51-200
9
201-500
3
501-1,000
1
5,001-10,000
1

Verified emails by last verification

0–30
620
31–60
40
61–90
0
90–180
1
180+
1

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 service providers, 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 “managed security service providers”. 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 managed security service providers, 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, 662 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 5, 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 service providers by metro

  • Managed security service providers in Dublin27

Frequently asked

How many managed security service providers are there based in Ireland?

RevenueBase identified 80 managed security service providers 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 managed security service providers?

Dublin leads with 27 headquartered companies, followed by Dun Laoghaire (2) and Galway (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 662 verified decision-maker contacts tracked across these 80 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 5, 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.