Company lists · Data verified August 2026

Top 25 Cybersecurity defense companies based in Greece

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 59 companies tracked

There are 59 cybersecurity defense companies headquartered in Greece (RevenueBase, August 2026). RevenueBase tracks 1,298 professional contacts across them, including 651 with verified work emails and 27 with mobile numbers. Athens is the largest hub.

This list covers cybersecurity defense companies 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.

59Companies

1,298Contacts tracked

651Verified emails

27Mobile numbers

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The 25 largest cybersecurity defense companies based in Greece

Ranked by team size

Top 25 of 59 cybersecurity defense companies 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	Threatscene	Athens	11-50	20	11
10	Alphabit Cybersecurity	n/a	11-50	17	2
11	Cenobe Cybersecurity	n/a	11-50	15	8
12	Cyber Noesis	n/a	11-50	12	11
13	Geniusnet SA	Athens	11-50	12	8
14	Memorandum	n/a	11-50	7	5
15	Ovit P.C	Athens	51-200	7	4
16	TÜV Austria Trust IT GR	Athens	11-50	7	4
17	Cysoft LTD	Athens	1-10	7	1
18	Logisek	n/a	11-50	6	5
19	PES Cybersecurity	n/a	1-10	6	4
20	Headnet	Athens	1-10	6	1
21	I-Metrix	Athens	11-50	5	3
22	Cyberone S.A	Athens	1-10	4	3
23	K2 Informatics	n/a	1-10	4	3
24	Vital Digital Forensics	Athens	1-10	4	3
25	Fsociety S.M. P.C	n/a	1-10	4	1

Showing 25 of 59 cybersecurity defense companies based in Greece

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Cybersecurity defense companies based in Greece at a glance

As of Aug 28, 2026

1-10Median size (employees)

AthensLargest hub · 28 HQs

27Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

Cybersecurity defense companies by metro

Metro	Companies
Cybersecurity defense companies in Athens	28
Cybersecurity defense companies in Attica	2
Cybersecurity defense companies in Thermi Thessaloniki	2
Cybersecurity defense companies in Thessaloniki	2
Cybersecurity defense companies in Kallithea	2
Cybersecurity defense companies in Salonica	1
Cybersecurity defense companies in Piraeus	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 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; 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 Greece?

There are 59 cybersecurity defense companies 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 defense companies?

Athens leads with 28 headquartered companies, followed by Attica (2) and Thermi Thessaloniki (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 651 verified decision-maker contacts tracked across these 59 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.