Company lists · Data verified August 2026

Top 25 Data security consulting firms based in Greece

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 64 companies tracked

There are 64 data security consulting firms headquartered in Greece (RevenueBase, August 2026). RevenueBase tracks 1,311 professional contacts across them, including 624 with verified work emails and 25 with mobile numbers. Athens is the largest hub.

This list covers data security consulting 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.

64Companies

1,311Contacts tracked

624Verified emails

25Mobile numbers

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The 25 largest data security consulting firms based in Greece

Ranked by team size

Top 25 of 64 data security consulting 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	Systecom S.A	Metamorfosi	11-50	25	14
7	Twelvesec	n/a	11-50	19	15
8	DTI Solutions	n/a	11-50	17	12
9	Alphabit Cybersecurity	n/a	11-50	17	2
10	Interstar Security	n/a	51-200	16	3
11	Cyber Noesis	n/a	11-50	12	11
12	Geniusnet SA	Athens	11-50	12	8
13	Vexillum Security Services	Piraeus	11-50	11	2
14	Gdpr Greece	n/a	11-50	10	4
15	Sigma Business Network	n/a	1-10	10	3
16	ICT Protect	n/a	1-10	7	5
17	TÜV Austria Trust IT GR	Athens	11-50	7	4
18	Itacc Solutions	n/a	11-50	7	3
19	Cysoft LTD	Athens	1-10	7	1
20	Logisek	n/a	11-50	6	5
21	PES Cybersecurity	n/a	1-10	6	4
22	I-Metrix	Athens	11-50	5	3
23	Cyberone S.A	Athens	1-10	4	3
24	Snsfortech S.A	Athens	11-50	4	2
25	Fsociety S.M. P.C	n/a	1-10	4	1

Showing 25 of 64 data security consulting firms based in Greece

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Data security consulting firms based in Greece at a glance

As of Aug 28, 2026

1-10Median size (employees)

AthensLargest hub · 18 HQs

25Contacts 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

Data security consulting firms by metro

Metro	Companies
Data security consulting firms in Athens	18
Data security consulting firms in Piraeus	2
Data security consulting firms in Thermi Thessaloniki	2
Data security consulting firms in Kallithea	2
Data security consulting firms in Atene	1
Data security consulting firms in Attica	1
Data security consulting firms in Metamorfosi	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 “data security consulting 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 data security consulting firms are there based in Greece?

There are 64 data security consulting 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 data security consulting firms?

Athens leads with 18 headquartered companies, followed by Piraeus (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 624 verified decision-maker contacts tracked across these 64 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.