Company lists · Data verified August 2026

Top 25 Cybersecurity defense contractors based in Ireland

Name: Cybersecurity defense contractors based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 54 companies tracked

There are 54 cybersecurity defense contractors headquartered in Ireland (RevenueBase, August 2026). RevenueBase tracks 943 professional contacts across them, including 534 with verified work emails and 36 with mobile numbers. Dublin is the largest hub.

This list covers cybersecurity defense contractors 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.

54Companies

943Contacts tracked

534Verified emails

36Mobile numbers

Unlock all 54 companies Free account · no credit card · 2 minutes

The 25 largest cybersecurity defense contractors based in Ireland

Ranked by team size

Top 25 of 54 cybersecurity defense contractors 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	Nostra	Dublin	201-500	286	204
2	Conscia	Citywest Business Campus	1,001-5,000	94	28
3	Titanhq	Galway	51-200	76	60
4	Trend Micro Europe	Cork	5,001-10,000	76	54
5	Secureism	Ireland	11-50	63	25
6	Threatscape	Sandyford	11-50	38	30
7	Cloudguard	Belfast	11-50	33	23
8	Commsec Cyber Security	n/a	11-50	22	8
9	Dectar	Dubli	11-50	21	13
10	Exclusive Networks Ireland	Ardcavan	11-50	16	12
11	Vmgroup	n/a	11-50	16	11
12	Cyber Armed Security	Dublin	11-50	14	4
13	AVR	n/a	51-200	14	2
14	ATORO	n/a	11-50	13	1
15	Penteor	Rathcoole	11-50	12	1
16	Ward Solutions	n/a	51-200	11	7
17	Bunker Technical Solutions	n/a	11-50	11	6
18	Enterprise Defence	Sligo	11-50	10	6
19	Intercept Technologies	Dublin	1-10	8	4
20	Secora Consulting LTD	Stranorlar	1-10	7	7
21	Cyberhealth	Dublin	1-10	7	4
22	Leacam Technology Consulting LTD	Dublin	1-10	7	3
23	NOVI	Dublin	11-50	5	3
24	Integrity360 Europe	n/a	201-500	4	3
25	Securicentrix	n/a	1-10	4	3

Showing 25 of 54 cybersecurity defense contractors based in Ireland

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 534 reachable decision-makers.

Free account · no credit card

See all 54 companies

Cybersecurity defense contractors based in Ireland at a glance

As of Aug 28, 2026

1-10Median size (employees)

DublinLargest hub · 19 HQs

36Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

5,001-10,000

Cybersecurity defense contractors by metro

Metro	Companies
Cybersecurity defense contractors in Dublin	19
Cybersecurity defense contractors in Wexford	1
Cybersecurity defense contractors in Sligo	1
Cybersecurity defense contractors in Sandyford	1
Cybersecurity defense contractors in Stranorlar	1
Cybersecurity defense contractors in Belfast	1
Cybersecurity defense contractors in Dubli	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 “cybersecurity defense contractors”, 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 cybersecurity defense contractors are there based in Ireland?

There are 54 cybersecurity defense contractors headquartered in Ireland as of August 2026 (RevenueBase).

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 cybersecurity defense contractors?

Dublin leads with 19 headquartered companies, followed by Wexford (1) and Sligo (1).

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 534 verified decision-maker contacts tracked across these 54 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.

Ready to reach these companies? Verified emails and direct dials for all 54 cybersecurity defense contractors based in Ireland. Start with a free account, no credit card.

Get the full list

Related lists

Cybersecurity defense contractors by geography

Browse the directory

Browse: Companies home · All Ireland lists · All Cybersecurity defense contractors lists · New lists

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.