Company lists · Data refreshed September 2026

Top 23 Security consultancy companies based in Greece

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 50 companies tracked

RevenueBase identified 50 security consultancy companies headquartered in Greece as of September 2026 and tracks 482 professional contacts across them, including 191 with verified work emails. Athens is the largest hub.

This list covers security consultancy companies 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

50Companies

482Contacts tracked

191Verified emails

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The 23 largest security consultancy companies based in Greece

Ranked by team size

Top 23 of 50 security consultancy companies 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 security consultancy companies: 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	Adacom	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	51-200	159 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 21, 2026
2	United Security	Partial evidence	Piraeus, GreeceHQ checked Sep 21, 2026	201-500	35 contacts →
	Partial evidence “The Company United Security is focused providing high security services tailored to the ever growing needs.” 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	Partial evidence	Chalandri, GreeceHQ checked Sep 21, 2026	11-50	20 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 21, 2026
5	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
6	Interstar Security	Partial evidence	Metamorfosi, GreeceHQ checked Sep 21, 2026	51-200	17 contacts →
	Partial 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 21, 2026
7	Mega Sprint Guard	Partial evidence	Thessaloniki, GreeceHQ checked Sep 21, 2026	1,001-5,000	17 contacts →
	Partial evidence “We offer service as: Crisis Management Risk Assessment Guardin Services Manned Security Services Electronic Security Systems Incident Management Station Armored luxury cars…” Source: RevenueBase Database · checked Sep 21, 2026
8	Cyber Noesis	Partial evidence	Agios Dimitrios, GreeceHQ checked Sep 21, 2026	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 21, 2026
9	Vexillum Security Services	Partial evidence	Piraeus, GreeceHQ checked Sep 21, 2026	11-50	11 contacts →
	Partial evidence “Vexillum Security was established to provide consulting services in the field of security in companies, organizations and individuals.” Source: RevenueBase Database · checked Sep 21, 2026
10	Sigma Business Network	Indirect evidence	Agios Stefanos, GreeceHQ checked Sep 21, 2026	1-10	10 contacts →
	Indirect 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 21, 2026
11	Ovit P.C	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	51-200	7 contacts →
	Partial evidence “Our mission statement illustrates our company culture: Ovit personnel provide Superior Security Services tailored specifically to the requirements of each individual or client's…” Source: RevenueBase Database · checked Sep 21, 2026
12	Trust-It Security Intelligence	Partial evidence	Cholargos - Athens, GreeceHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “Trust-IT (Trust Information Technologies) is an Enterprise Security Provider & IT Solutions Company, which leverages the sector of IT Security Intelligence in conjunction with…” Source: RevenueBase Database · checked Sep 21, 2026
13	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
14	In2solution P.C	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	6 contacts →
	Partial evidence “Ιn2solution is an advanced security solutions company based in Athens.” Source: RevenueBase Database · checked Sep 21, 2026
15	I-Metrix	Partial evidence	Athens, GreeceHQ checked Sep 21, 2026	11-50	5 contacts →
	Partial evidence “Started in is now one of the leading companies in managed security services.” Source: RevenueBase Database · checked Sep 21, 2026
16	Safeguard Security Services & Systems	Partial evidence	Chaidari, GreeceHQ checked Sep 21, 2026	51-200	5 contacts →
	Partial evidence “SAFEGUARD Security Services & Systems since 2013, provides comprehensive and reliable Security Services.” Source: RevenueBase Database · checked Sep 21, 2026
17	Cyberone S.A	Partial evidence	Chalandri, GreeceHQ checked Sep 21, 2026	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 21, 2026
18	Snsfortech S.A	Indirect evidence	Chalandri, GreeceHQ checked Sep 21, 2026	11-50	4 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
19	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
20	Nisos Advisors	Partial evidence	Amaroúsion, GreeceHQ checked Sep 21, 2026	11-50	2 contacts →
	Partial evidence “Nisos Advisors was established in 2017 by a team of partners with extensive field experience each with over twenty years of line management and consultancy practice.” Source: RevenueBase Database · checked Sep 21, 2026
21	Alliance Security Consulting	Partial evidence	Kifisia, GreeceHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “Security Consulting” Source: RevenueBase Database · checked Sep 21, 2026
22	Inventa Technology Products & Services	Partial evidence	Vrilissia, GreeceHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “Inventa can undertake any aspect of consultancy, infrastructure design, sourcing, deployment and support covering the domains of Information Technology and Safety.” Source: RevenueBase Database · checked Sep 21, 2026
23	ST Consultants Security Consulting Services	Partial evidence	Thessaloniki, GreeceHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “At ST Consultant our mission is to empower our clients with the knowledge, strategies, and technologies needed to protect their assets, people, and information.” 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: security consultancy companies. 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 security consultancy companies.
Partial evidence: Its own public description names part of security consultancy companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name security consultancy companies. 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 23 of 50 security consultancy companies based in Greece

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Security consultancy companies based in Greece at a glance

As of Sep 21, 2026

39.6%Verified-email coverage

9.6Average contacts per company

11-50Median size (employees)

32.0%Largest-city concentration · Athens

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 50 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 security consultancy companies, 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 “security consultancy companies”. 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 security consultancy companies), 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 security consultancy companies, 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, 191 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.

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 security consultancy companies, 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 security consultancy companies are there based in Greece?

RevenueBase identified 50 security consultancy companies 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?

Adacom, headquartered in Athens, tops this list with the largest team on record.

Which city has the most security consultancy companies?

Athens leads with 16 headquartered companies, followed by Piraeus (2) and Kallithea (1).

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 191 verified decision-maker contacts tracked across these 50 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.