Company lists · Data verified August 2026

Top 25 Cybersecurity companies in Ireland

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 118 companies tracked

Our directory lists 118 cybersecurity companies in Ireland, with 6,548 professional contacts and 3,058 email addresses. The list was last updated in August 2026, and Dublin is the single most-represented city among the companies listed.

Cybersecurity companies provide products and services that protect systems, networks, applications, devices, and data from unauthorized access, disruption, or misuse. This list covers companies that provide cybersecurity products, services, consulting, assessments, monitoring, incident response, or related protection for digital systems and data. Ranked by team size, largest first. Data current as of August 28, 2026.

118Companies

6,548Contacts tracked

3,058Verified emails

1,251Mobile numbers

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The 25 largest cybersecurity companies in Ireland

Ranked by team size

Top 25 of 118 cybersecurity companies 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	Kaseya	Dublin	5,001-10,000	4,238	1,912
2	Malwarebytes	Cork	501-1,000	606	330
3	Nostra	Dublin	201-500	286	204
4	Smarttech247	Belfast	51-200	188	79
5	Conscia	Citywest Business Campus	1,001-5,000	94	28
6	BH Consulting	Blanchardstown	11-50	81	14
7	Titanhq	Galway	51-200	76	60
8	Trend Micro Europe	Cork	5,001-10,000	76	54
9	Secureism	Ireland	11-50	63	25
10	Threatscape	Sandyford	11-50	38	30
11	Thinscale Technology LTD	Dun Laoghaire	51-200	33	30
12	Cloudguard	Belfast	11-50	33	23
13	Paradyn	n/a	51-200	28	24
14	Dataway	n/a	11-50	28	11
15	Enigmasoft Limited	Dublin	51-200	22	11
16	Commsec Cyber Security	n/a	11-50	22	8
17	Dectar	Dubli	11-50	21	13
18	Whatsexposed	Castlebar	11-50	20	8
19	Mirror Security	Dublin	11-50	18	12
20	Exclusive Networks Ireland	Ardcavan	11-50	16	12
21	Vmgroup	n/a	11-50	16	11
22	Cytidel	n/a	11-50	16	11
23	Cyber Armed Security	Dublin	11-50	14	4
24	AVR	n/a	51-200	14	2
25	Datatrust	n/a	11-50	13	7
26	ATORO	n/a	11-50	13	1
27	Penteor	Rathcoole	11-50	12	1
28	Nova Leah	Dundalk	11-50	11	9

Showing 25 of 118 cybersecurity companies in Ireland

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Cybersecurity companies in Ireland at a glance

As of Aug 28, 2026

1-10Median size (employees)

DublinLargest hub · 36 HQs

1,251Contacts with mobile numbers

25Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Companies by metro

Metro	Companies
Cybersecurity companies in Dublin	36
Cybersecurity companies in Cork	7
Cybersecurity companies in Galway	4
Cybersecurity companies in Swords	2
Cybersecurity companies in Belfast	2
Cybersecurity companies in Dun Laoghaire	2
Cybersecurity companies in Ireland	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 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; 25 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 companies are in the directory?

The directory lists 118 cybersecurity companies in Ireland.

Which city has the most cybersecurity companies?

Dublin is the single most-represented city among the cybersecurity companies on the list.

How many contacts are available for cybersecurity companies?

The directory includes 6,548 professional contacts and 3,058 email addresses for the listed cybersecurity companies.

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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.