Company lists · Data verified August 2026

Top 25 Cybersecurity defense companies based in Ireland

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 58 companies tracked

There are 58 cybersecurity defense companies headquartered in Ireland (RevenueBase, August 2026). RevenueBase tracks 1,241 professional contacts across them, including 652 with verified work emails and 45 with mobile numbers. Dublin is the largest hub.

This list covers cybersecurity defense 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.

58Companies

1,241Contacts tracked

652Verified emails

45Mobile numbers

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The 25 largest cybersecurity defense companies based in Ireland

Ranked by team size

Top 25 of 58 cybersecurity defense 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	Nostra	Dublin	201-500	286	204
2	Smarttech247	Belfast	51-200	188	79
3	Conscia	Citywest Business Campus	1,001-5,000	94	28
4	BH Consulting	Blanchardstown	11-50	81	14
5	Titanhq	Galway	51-200	76	60
6	Trend Micro Europe	Cork	5,001-10,000	76	54
7	Secureism	Ireland	11-50	63	25
8	Threatscape	Sandyford	11-50	38	30
9	Cloudguard	Belfast	11-50	33	23
10	Paradyn	n/a	51-200	28	24
11	Commsec Cyber Security	n/a	11-50	22	8
12	Dectar	Dubli	11-50	21	13
13	Exclusive Networks Ireland	Ardcavan	11-50	16	12
14	Vmgroup	n/a	11-50	16	11
15	Cyber Armed Security	Dublin	11-50	14	4
16	AVR	n/a	51-200	14	2
17	ATORO	n/a	11-50	13	1
18	Penteor	Rathcoole	11-50	12	1
19	Ward Solutions	n/a	51-200	11	7
20	Bunker Technical Solutions	n/a	11-50	11	6
21	Enterprise Defence	Sligo	11-50	10	6
22	Intercept Technologies	Dublin	1-10	8	4
23	Secora Consulting LTD	Stranorlar	1-10	7	7
24	Cyberhealth	Dublin	1-10	7	4
25	Leacam Technology Consulting LTD	Dublin	1-10	7	3

Showing 25 of 58 cybersecurity defense companies based in Ireland

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Cybersecurity defense companies based in Ireland at a glance

As of Aug 28, 2026

1-10Median size (employees)

DublinLargest hub · 20 HQs

45Contacts 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 companies by metro

Metro	Companies
Cybersecurity defense companies in Dublin	20
Cybersecurity defense companies in Belfast	2
Cybersecurity defense companies in Sligo	1
Cybersecurity defense companies in Wexford	1
Cybersecurity defense companies in Sandyford	1
Cybersecurity defense companies in Stranorlar	1
Cybersecurity defense companies in Wicklow	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 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 cybersecurity defense companies are there based in Ireland?

There are 58 cybersecurity defense companies 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 companies?

Dublin leads with 20 headquartered companies, followed by Belfast (2) 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 652 verified decision-maker contacts tracked across these 58 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.