Company lists · Data verified August 2026

Top 25 Cybersecurity firms based in Greece

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 102 companies tracked

There are 102 cybersecurity firms headquartered in Greece (RevenueBase, August 2026). RevenueBase tracks 1,567 professional contacts across them, including 722 with verified work emails and 34 with mobile numbers. Athens is the largest hub.

This list covers cybersecurity firms headquartered in Greece, 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.

102Companies

1,567Contacts tracked

722Verified emails

34Mobile numbers

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The 25 largest cybersecurity firms based in Greece

Ranked by team size

Top 25 of 102 cybersecurity firms based in Greece, 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	Nviso Security	Athens	201-500	311	205
2	Obrela	Athens	201-500	242	146
3	Census	Thermi Thessaloniki	51-200	184	46
4	Adacom	Thermi Thessaloniki	51-200	157	91
5	Itway Cyber Security And Resiliency	Atene	51-200	81	23
6	Cyberowl	Athens	51-200	56	34
7	Systecom S.A	Metamorfosi	11-50	25	14
8	K3y	n/a	11-50	25	4
9	Cyberscope, A TAC Security Company	Athens	11-50	23	7
10	Threatscene	Athens	11-50	20	11
11	Twelvesec	n/a	11-50	19	15
12	DTI Solutions	n/a	11-50	17	12
13	Alphabit Cybersecurity	n/a	11-50	17	2
14	Cenobe Cybersecurity	n/a	11-50	15	8
15	Xgate Solutions	n/a	11-50	13	8
16	Cyber Noesis	n/a	11-50	12	11
17	Geniusnet SA	Athens	11-50	12	8
18	Mind The Hack	n/a	11-50	11	8
19	Cyberflip	Athens	1-10	11	7
20	Accessit LTD	Athens	11-50	9	2
21	CSI Institute	Athens	11-50	9	1
22	Memorandum	n/a	11-50	7	5
23	Ovit P.C	Athens	51-200	7	4
24	TÜV Austria Trust IT GR	Athens	11-50	7	4
25	Plugsecure	Athens	1-10	7	4

Showing 25 of 102 cybersecurity firms based in Greece

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Cybersecurity firms based in Greece at a glance

As of Aug 28, 2026

1-10Median size (employees)

AthensLargest hub · 44 HQs

34Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

Cybersecurity firms by metro

Metro	Companies
Cybersecurity firms in Athens	44
Cybersecurity firms in Thessaloniki	4
Cybersecurity firms in Attica	2
Cybersecurity firms in Thermi Thessaloniki	2
Cybersecurity firms in Heraklion	2
Cybersecurity firms in Kallithea	2
Cybersecurity firms in Salonica	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 Greece.
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 Greece?

There are 102 cybersecurity firms headquartered in Greece as of August 2026 (RevenueBase).

What is the largest company on this list?

Nviso Security, headquartered in Athens, tops this list with the largest team on record.

Which city has the most cybersecurity firms?

Athens leads with 44 headquartered companies, followed by Thessaloniki (4) and Attica (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 722 verified decision-maker contacts tracked across these 102 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.