Company lists · Data refreshed September 2026

Top 25 Cybersecurity advisors based in Greece

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 60 companies tracked

RevenueBase identified 60 cybersecurity advisors headquartered in Greece as of September 2026 and tracks 1,016 professional contacts across them, including 303 with verified work emails. Athens is the largest hub.

This list covers cybersecurity advisors 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 21, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

60Companies

1,016Contacts tracked

303Verified emails

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The 25 largest cybersecurity advisors based in Greece

Ranked by team size

Top 25 of 60 cybersecurity advisors based in Greece, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity advisors: 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	Census	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	51-200	194 contacts →
	Partial evidence “CENSUS is a cybersecurity engineering powerhouse.” Source: RevenueBase Database · checked Sep 21, 2026
2	Adacom	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	51-200	159 contacts →
	Indirect 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 21, 2026
3	Systecom S.A	Indirect evidence	Metamorfosi, GreeceHQ checked Sep 21, 2026	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 21, 2026
4	Twelvesec	Indirect evidence	Chalandri, GreeceHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “With constant integration of technology in every aspect of an organisation, information security is something that everyone needs.” Source: RevenueBase Database · checked Sep 21, 2026
5	Threatscene	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	20 contacts →
	Partial evidence “At ThreatScene, we are committed to setting new standards in cybersecurity by delivering exceptional, high-quality services designed to protect your most valuable digital assets.” Source: RevenueBase Database · checked Sep 21, 2026
6	DTI Solutions	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	17 contacts →
	Indirect evidence “100+ years of combined experience.” Source: RevenueBase Database · checked Sep 21, 2026
7	Alphabit Cybersecurity	Partial evidence	Khalándrion, GreeceHQ checked Sep 21, 2026	11-50	17 contacts →
	Partial evidence “Alphabit is an expert Cybersecurity services provider.” Source: RevenueBase Database · checked Sep 21, 2026
8	Cenobe Cybersecurity	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	15 contacts →
	Partial evidence “Reduce cybersecurity risk proactively by identifying security gaps and vulnerabilities before they can be exploited by malicious actors.” Source: RevenueBase Database · checked Sep 21, 2026
9	Cyber Noesis	Indirect evidence	Agios Dimitrios, GreeceHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “CyberNoesis was established in 2015 by cyber security specialists with extensive experience in enterprise, industrial and telecommunications sectors.” Source: RevenueBase Database · checked Sep 21, 2026
10	Geniusnet SA	Partial evidence	Chalandri Athens, GreeceHQ checked Sep 21, 2026	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 21, 2026
11	Cyberflip	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	1-10	11 contacts →
	Partial evidence “We are here to jointly understand and address in practice how Cybersecurity can be a business enabler- Providing Cybersecurity services, industry-specific, vendor neutral and…” Source: RevenueBase Database · checked Sep 21, 2026
12	CSI Institute	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “Διεθνες ινστιτουτο κυβερνοασφαλειας” Source: RevenueBase Database · checked Sep 21, 2026
13	Memorandum	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “A cyber security company that offers bespoke, impact-centric services through envisioning, designing, crafting and providing critical Cyber Security Solutions and advanced A.I.” Source: RevenueBase Database · checked Sep 21, 2026
14	TÜV Austria Trust IT GR	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect 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 21, 2026
15	Cygnus Technologies	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “Cygnus Technologies is a leading Greece-based provider of managed IT Cybersecurity services for the shipping industry.” Source: RevenueBase Database · checked Sep 21, 2026
16	Cysoft LTD	Indirect evidence	Nea Smyrni, GreeceHQ checked Sep 21, 2026	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 21, 2026
17	Logisek	Indirect evidence	Koropi, GreeceHQ checked Sep 21, 2026	11-50	6 contacts →
	Indirect 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 21, 2026
18	PES Cybersecurity	Partial evidence	GreeceHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial 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 21, 2026
19	Headnet	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial evidence “At HEADNET, we deliver advanced networking and cybersecurity solutions designed to meet your unique business needs.” Source: RevenueBase Database · checked Sep 21, 2026
20	I-Metrix	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	5 contacts →
	Indirect evidence “Started in is now one of the leading companies in managed security services.” Source: RevenueBase Database · checked Sep 21, 2026
21	Cyberone S.A	Indirect evidence	Chalandri, GreeceHQ checked Sep 21, 2026	1-10	4 contacts →
	Indirect 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 21, 2026
22	Vital Digital Forensics	Indirect evidence	Athens, GreeceHQ checked Sep 21, 2026	1-10	4 contacts →
	Indirect evidence “Privately held company providing cyber-security services, specializing in Digital Forensics / Incident Response (DFIR), malware analysis.” Source: RevenueBase Database · checked Sep 21, 2026
23	K2 Informatics	Partial evidence	Néa Ionía, GreeceHQ checked Sep 21, 2026	1-10	4 contacts →
	Partial evidence “Maritime Cybersecurity” Source: RevenueBase Database · checked Sep 21, 2026
24	Fsociety S.M. P.C	Indirect evidence	Pireas, GreeceHQ checked Sep 21, 2026	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 21, 2026
25	Raven Cybersecurity	Partial evidence	Heraklion, GreeceHQ checked Sep 21, 2026	1-10	3 contacts →
	Partial evidence “Raven Cyber Security is a startup specializing in cybersecurity services, including penetration testing, production of cyber security learning courses, and software development.” Source: RevenueBase Database · checked Sep 21, 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: cybersecurity advisors. 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 cybersecurity advisors.
Partial evidence: Its own public description names part of cybersecurity advisors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity advisors. 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 60 cybersecurity advisors based in Greece

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Cybersecurity advisors based in Greece at a glance

As of Sep 21, 2026

29.8%Verified-email coverage

16.9Average contacts per company

1-10Median size (employees)

43.3%Largest-city concentration · Athens

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured worldwide rather than for Greece, so it is reported there. Company counts and contact totals on this page are exact for Greece, over 60 companies.

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 cybersecurity advisors, 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 “cybersecurity advisors”. 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 cybersecurity advisors), 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 cybersecurity advisors, 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, 303 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 21, 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.

Cybersecurity advisors by metro

Cybersecurity advisors in Athens26

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 cybersecurity advisors, 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 cybersecurity advisors are there based in Greece?

RevenueBase identified 60 cybersecurity advisors 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?

Census, headquartered in Greece, tops this list with the largest team on record.

Which city has the most cybersecurity advisors?

Athens leads with 26 headquartered companies, followed by Attica (2) and Kallithea (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 303 verified decision-maker contacts tracked across these 60 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 21, 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.