Company lists · Data verified August 2026

Top 25 Cybersecurity firms based in Ireland

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 105 companies tracked

There are 105 cybersecurity firms headquartered in Ireland (RevenueBase, August 2026). RevenueBase tracks 2,098 professional contacts across them, including 1,086 with verified work emails and 276 with mobile numbers. Dublin is the largest hub.

This list covers cybersecurity firms 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.

105Companies

2,098Contacts tracked

1,086Verified emails

276Mobile numbers

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The 25 largest cybersecurity firms based in Ireland

Ranked by team size

Top 25 of 105 cybersecurity firms 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	Malwarebytes	Cork	501-1,000	606	330
2	Nostra	Dublin	201-500	286	204
3	Smarttech247	Belfast	51-200	188	79
4	Conscia	Citywest Business Campus	1,001-5,000	94	28
5	BH Consulting	Blanchardstown	11-50	81	14
6	Titanhq	Galway	51-200	76	60
7	Trend Micro Europe	Cork	5,001-10,000	76	54
8	Secureism	Ireland	11-50	63	25
9	Threatscape	Sandyford	11-50	38	30
10	Cloudguard	Belfast	11-50	33	23
11	Paradyn	n/a	51-200	28	24
12	Dataway	n/a	11-50	28	11
13	Enigmasoft Limited	Dublin	51-200	22	11
14	Commsec Cyber Security	n/a	11-50	22	8
15	Dectar	Dubli	11-50	21	13
16	Whatsexposed	Castlebar	11-50	20	8
17	Mirror Security	Dublin	11-50	18	12
18	Cyber Ireland	n/a	1-10	17	4
19	Exclusive Networks Ireland	Ardcavan	11-50	16	12
20	Cytidel	n/a	11-50	16	11
21	Vmgroup	n/a	11-50	16	11
22	Cyber Armed Security	Dublin	11-50	14	4
23	AVR	n/a	51-200	14	2
24	ATORO	n/a	11-50	13	1
25	Penteor	Rathcoole	11-50	12	1

Showing 25 of 105 cybersecurity firms based in Ireland

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Cybersecurity firms based in Ireland at a glance

As of Aug 28, 2026

1-10Median size (employees)

DublinLargest hub · 33 HQs

276Contacts with mobile numbers

1Emails 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

Cybersecurity firms by metro

Metro	Companies
Cybersecurity firms in Dublin	33
Cybersecurity firms in Cork	5
Cybersecurity firms in Galway	3
Cybersecurity firms in Swords	2
Cybersecurity firms in Belfast	2
Cybersecurity firms in Ireland	1
Cybersecurity firms in Sandyford	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 firms”, 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; 1 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 firms are there based in Ireland?

There are 105 cybersecurity firms headquartered in Ireland as of August 2026 (RevenueBase).

What is the largest company on this list?

Malwarebytes, headquartered in Cork, tops this list with the largest team on record.

Which city has the most cybersecurity firms?

Dublin leads with 33 headquartered companies, followed by Cork (5) and Galway (3).

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 1,086 verified decision-maker contacts tracked across these 105 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.