Company lists · Data verified August 2026

Top 17 Defense cybersecurity companies based in Ireland

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 32 companies tracked

There are 32 defense cybersecurity companies headquartered in Ireland (RevenueBase, August 2026). RevenueBase tracks 488 professional contacts across them, including 235 with verified work emails and 16 with mobile numbers. Dublin is the largest hub.

This list covers defense cybersecurity companies headquartered in Ireland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

32Companies

488Contacts tracked

235Verified emails

16Mobile numbers

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The 17 largest defense cybersecurity companies based in Ireland

Ranked by team size

Top 17 of 32 defense cybersecurity companies based in Ireland, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Smarttech247	Belfast	51-200	188	79
2	Trend Micro Europe	Cork	5,001-10,000	76	54
3	Threatscape	Sandyford	11-50	38	30
4	Cloudguard	Belfast	11-50	33	23
5	Commsec Cyber Security	n/a	11-50	22	8
6	Exclusive Networks Ireland	Ardcavan	11-50	16	12
7	Cyber Armed Security	Dublin	11-50	14	4
8	ATORO	n/a	11-50	13	1
9	Enterprise Defence	Sligo	11-50	10	6
10	Ripplecom L A Viatel Group Company	Limerick Lk	11-50	8	2
11	Cyberhealth	Dublin	1-10	7	4
12	Cybertree Engineers	Dublin	1-10	5	3
13	Cytekone	n/a	1-10	3	3
14	Cybersecure365	Killybegs	1-10	3	3
15	Darium Technologies	n/a	11-50	2	1
16	Pure IT Universe	Dublin	1-10	1	1
17	Verus Risk Management	n/a	1-10	1	1

Showing 17 of 32 defense cybersecurity companies based in Ireland

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Defense cybersecurity companies based in Ireland at a glance

As of Aug 28, 2026

1-10Median size (employees)

DublinLargest hub · 12 HQs

16Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

5,001-10,000

Defense cybersecurity companies by metro

Metro	Companies
Defense cybersecurity companies in Dublin	12
Defense cybersecurity companies in Belfast	2
Defense cybersecurity companies in Cork	2
Defense cybersecurity companies in Wexford	1
Defense cybersecurity companies in Sligo	1
Defense cybersecurity companies in Sandyford	1
Defense cybersecurity companies in Cahir	1

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “defense cybersecurity companies”, with match quality audited by blind human judging, and headquartered in Ireland.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many defense cybersecurity companies are there based in Ireland?

There are 32 defense cybersecurity companies headquartered in Ireland as of August 2026 (RevenueBase).

What is the largest company on this list?

Smarttech247, headquartered in Belfast, tops this list with the largest team on record.

Which city has the most defense cybersecurity companies?

Dublin leads with 12 headquartered companies, followed by Belfast (2) and Cork (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 235 verified decision-maker contacts tracked across these 32 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.