Company lists · Data verified August 2026

Top 19 Defense cybersecurity companies based in Greece

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 41 companies tracked

There are 41 defense cybersecurity companies headquartered in Greece (RevenueBase, August 2026). RevenueBase tracks 1,260 professional contacts across them, including 627 with verified work emails and 24 with mobile numbers. Athens is the largest hub.

This list covers defense cybersecurity 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.

41Companies

1,260Contacts tracked

627Verified emails

24Mobile numbers

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The 19 largest defense cybersecurity companies based in Greece

Ranked by team size

Top 19 of 41 defense cybersecurity 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	Scytalys S.A	n/a	51-200	96	52
6	Itway Cyber Security And Resiliency	Atene	51-200	81	23
7	K3y	n/a	11-50	25	4
8	Threatscene	Athens	11-50	20	11
9	Cenobe Cybersecurity	n/a	11-50	15	8
10	Cyber Noesis	n/a	11-50	12	11
11	Memorandum	n/a	11-50	7	5
12	TÜV Austria Trust IT GR	Athens	11-50	7	4
13	Cysoft LTD	Athens	1-10	7	1
14	Logisek	n/a	11-50	6	5
15	PES Cybersecurity	n/a	1-10	6	4
16	Headnet	Athens	1-10	6	1
17	Cyberone S.A	Athens	1-10	4	3
18	Fractis	Athens	1-10	2	2
19	Cyberx Csis	n/a	1-10	2	1

Showing 19 of 41 defense cybersecurity companies based in Greece

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Defense cybersecurity companies based in Greece at a glance

As of Aug 28, 2026

1-10Median size (employees)

AthensLargest hub · 16 HQs

24Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

Defense cybersecurity companies by metro

Metro	Companies
Defense cybersecurity companies in Athens	16
Defense cybersecurity companies in Attica	2
Defense cybersecurity companies in Thermi Thessaloniki	2
Defense cybersecurity companies in Salonica	1
Defense cybersecurity companies in Piraeus	1
Defense cybersecurity companies in Atene	1
Defense cybersecurity companies in Thessaloniki	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 “defense cybersecurity 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 defense cybersecurity companies are there based in Greece?

There are 41 defense cybersecurity 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 defense cybersecurity companies?

Athens leads with 16 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 627 verified decision-maker contacts tracked across these 41 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.