Company lists · Data refreshed September 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 Data refreshed Sep 1, 2026 64 companies tracked

RevenueBase identified 64 data security consulting firms headquartered in Greece as of September 2026 and 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

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 refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to data security consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Nviso Security	Partial evidence	Athens, Greece	201-500	311 contacts →
	Partial evidence “NVISO is a cyber security services firm composed of outstanding security professionals - each has a specific field of expertise, ranging from security research and risk management…” Source: RevenueBase Database · checked Sep 1, 2026
2	Obrela	Partial evidence	Athens, Greece	201-500	242 contacts →
	Partial evidence “Obrela Security Industries is a global provider of cyber security services.” Source: RevenueBase Database · checked Sep 1, 2026
3	Census	Indirect evidence	Thermi Thessaloniki, Greece	51-200	184 contacts →
	Indirect evidence “CENSUS is a cybersecurity engineering powerhouse.” Source: RevenueBase Database · checked Sep 1, 2026
4	Adacom	Partial evidence	Thermi Thessaloniki, Greece	51-200	157 contacts →
	Partial evidence “ADACOM, a Byte subsidiary, enables security online for Financial Institutions, Telecom Operators, Governments and Large Organizations, in more than 30 countries in EMEA.” Source: RevenueBase Database · checked Sep 1, 2026
5	Itway Cyber Security And Resiliency	Partial evidence	Atene, Greece	51-200	81 contacts →
	Partial evidence “Itway Cyber Security and Resiliency, parte del Gruppo Itway, supporta le organizzazioni nella protezione degli ambienti digitali e mission-critical, garantendo operatività sicura…” Source: RevenueBase Database · checked Sep 1, 2026
6	Systecom S.A	Indirect evidence	Metamorfosi, Greece	11-50	25 contacts →
	Indirect evidence “Our company's structure is based on a modern and flexible model ensuring adaptation in running developments but also in continuous requirements and needs of our clients.” Source: RevenueBase Database · checked Sep 1, 2026
7	Twelvesec	Partial evidence	Greece	11-50	19 contacts →
	Partial evidence “With constant integration of technology in every aspect of an organisation, information security is something that everyone needs.” Source: RevenueBase Database · checked Sep 1, 2026
8	DTI Solutions	Indirect evidence	Greece	11-50	17 contacts →
	Indirect evidence “100+ years of combined experience.” Source: RevenueBase Database · checked Sep 1, 2026
9	Alphabit Cybersecurity	Indirect evidence	Greece	11-50	17 contacts →
	Indirect evidence “Alphabit is an expert Cybersecurity services provider.” Source: RevenueBase Database · checked Sep 1, 2026
10	Interstar Security	Strong evidence	Greece	51-200	16 contacts →
	Strong evidence “Founded in 1988, INTERSTAR Security is offering a broad array of customized, high quality, integrated consulting and security services.” Source: RevenueBase Database · checked Sep 1, 2026
11	Cyber Noesis	Partial evidence	Greece	11-50	12 contacts →
	Partial evidence “CyberNoesis was established in 2015 by cyber security specialists with extensive experience in enterprise, industrial and telecommunications sectors.” Source: RevenueBase Database · checked Sep 1, 2026
12	Geniusnet SA	Partial evidence	Athens, Greece	11-50	12 contacts →
	Partial evidence “GeniusNet SA is a High tech Cybersecurity and Smart security Company specialized on Supporting your business!” Source: RevenueBase Database · checked Sep 1, 2026
13	Vexillum Security Services	Strong evidence	Piraeus, Greece	11-50	11 contacts →
	Strong evidence “Vexillum Security was established to provide consulting services in the field of security in companies, organizations and individuals.” Source: RevenueBase Database · checked Sep 1, 2026
14	Gdpr Greece	Indirect evidence	Greece	11-50	10 contacts →
	Indirect evidence “H GDPR Greece ιδρύθηκε από δύο ανθρώπους που έχουν ταυτιστεί στην Ελλάδα με την ασφάλεια πληροφοριακών συστημάτων και το ηλεκτρονικό έγκλημα.” Source: RevenueBase Database · checked Sep 1, 2026
15	Sigma Business Network	Partial evidence	Greece	1-10	10 contacts →
	Partial evidence “Sigma Business Network provides its customers with high-level, fully customized Consulting Services and Integrated Programs to assist them in the critical areas of- Risk &…” Source: RevenueBase Database · checked Sep 1, 2026
16	ICT Protect	Partial evidence	Greece	1-10	7 contacts →
	Partial evidence “ICT PROTECT is an information security firm, specialising in Security Management and Security Training services.” Source: RevenueBase Database · checked Sep 1, 2026
17	TÜV Austria Trust IT GR	Partial evidence	Athens, Greece	11-50	7 contacts →
	Partial evidence “Established in 2024, TÜV AUSTRIA Trust IT stands as a subsidiary of TÜV AUSTRIA, specializing in comprehensive information security and IT-related services.” Source: RevenueBase Database · checked Sep 1, 2026
18	Itacc Solutions	Indirect evidence	Greece	11-50	7 contacts →
	Indirect evidence “ITACC Solutions empowers people and organizations to grow in the digital era in a productive, reliable, and secure way, and maximize their return on investment.” Source: RevenueBase Database · checked Sep 1, 2026
19	Cysoft LTD	Indirect evidence	Athens, Greece	1-10	7 contacts →
	Indirect evidence “Η Cysoft Σύμβουλοι Πληροφορικής ΕΠΕ ιδρύθηκε το 1998 για να διαθέσει στην Ελληνική Αγορά επιλεγμένα προϊόντα και λύσεις ασφάλειας πληροφορικής.” Source: RevenueBase Database · checked Sep 1, 2026
20	Logisek	Partial evidence	Greece	11-50	6 contacts →
	Partial evidence “Logisek is a leading Cyber Security and IT services firm, founded in Greece in 2008 and expanded to Romania in 2019.” Source: RevenueBase Database · checked Sep 1, 2026
21	PES Cybersecurity	Indirect evidence	Greece	1-10	6 contacts →
	Indirect evidence “PeS Cybersecurity, your trusted partner in safeguarding your digital domain, born from the dynamic collaboration between two industry leaders, Pylones Hellas, and eSafe, brings…” Source: RevenueBase Database · checked Sep 1, 2026
22	I-Metrix	Partial evidence	Athens, Greece	11-50	5 contacts →
	Partial evidence “Started in is now one of the leading companies in managed security services.” Source: RevenueBase Database · checked Sep 1, 2026
23	Cyberone S.A	Partial evidence	Athens, Greece	1-10	4 contacts →
	Partial evidence “At CyberOne we select and integrate the most advanced IT security solutions to address the evolving needs of corporate customers who must protect their information repositories…” Source: RevenueBase Database · checked Sep 1, 2026
24	Snsfortech S.A	Indirect evidence	Athens, Greece	11-50	4 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 1, 2026
25	Fsociety S.M. P.C	Indirect evidence	Greece	1-10	4 contacts →
	Indirect evidence “f society was founded in 2017 in Greece during the economic crisis, breaking the brain drain rule.” Source: RevenueBase Database · checked Sep 1, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: data security consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names data security consulting firms.
Partial evidence: Its own public description names part of data security consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name data security consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

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 Sep 1, 2026

47.6%Verified-email coverage

1.9%Mobile-number coverage

20.5Average contacts per company

1-10Median size (employees)

28.1%Largest-city concentration · Athens

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among data security consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Greece whose own description of what they do matches “data security consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names data security consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among data security consulting firms, and records with no verified work email. Companies headquartered outside Greece are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 624 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 1, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names data security consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many data security consulting firms are there based in Greece?

RevenueBase identified 64 data security consulting firms headquartered in Greece as of September 2026, matched on each company's own description of what it does rather than its industry code.

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 refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.