Company lists · Data refreshed September 2026

Top 25 Network security consulting firms based in Greece

RevenueBase identified 65 network security consulting firms headquartered in Greece as of September 2026 and tracks 720 professional contacts across them, including 276 with verified work emails and 23 with mobile numbers. Athens is the largest hub.

This list covers network 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
65Companies
720Contacts tracked
276Verified emails
23Mobile numbers
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The 25 largest network security consulting firms based in Greece

Ranked by team size
Top 25 of 65 network security consulting firms based in Greece, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names network security consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
CensusIndirect evidence
Athens, GreeceHQ checked Sep 5, 202651-200194

“CENSUS is a cybersecurity engineering powerhouse.”

Source: company website · checked Sep 5, 2026
2
AdacomPartial evidence
Athens, GreeceHQ checked Sep 5, 202651-200159

“ADACOM, a Byte subsidiary, enables security online for Financial Institutions, Telecom Operators, Governments and Large Organizations, in more than 30 countries in EMEA.”

Source: company website · checked Sep 5, 2026
3
Systecom S.AIndirect evidence
Metamorfosi, GreeceHQ checked Sep 5, 202611-5025

“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: company website · checked Sep 5, 2026
4
TwelvesecPartial evidence
Chalandri, GreeceHQ checked Sep 5, 202611-5020

“With constant integration of technology in every aspect of an organisation, information security is something that everyone needs.”

Source: company website · checked Sep 5, 2026
5
ThreatsceneIndirect evidence
Athens, GreeceHQ checked Sep 5, 202611-5020

“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: company website · checked Sep 5, 2026
6
DTI SolutionsIndirect evidence
Athens, GreeceHQ checked Sep 5, 202611-5017

“100+ years of combined experience.”

Source: company website · checked Sep 5, 2026
7
Interstar SecurityStrong evidence
Metamorfosi, GreeceHQ checked Sep 5, 202651-20017

“Founded in 1988, INTERSTAR Security is offering a broad array of customized, high quality, integrated consulting and security services.”

Source: company website · checked Sep 5, 2026
8
Alphabit CybersecurityIndirect evidence
Khalándrion, GreeceHQ checked Sep 5, 202611-5017

“Alphabit is an expert Cybersecurity services provider.”

Source: company website · checked Sep 5, 2026
9
Cyber NoesisPartial evidence
Agios Dimitrios, GreeceHQ checked Sep 5, 202611-5012

“CyberNoesis was established in 2015 by cyber security specialists with extensive experience in enterprise, industrial and telecommunications sectors.”

Source: company website · checked Sep 5, 2026
10
CyberflipIndirect evidence
Athens, GreeceHQ checked Sep 5, 20261-1011

“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: company website · checked Sep 5, 2026
11Piraeus, GreeceHQ checked Sep 5, 202611-5011

“Vexillum Security was established to provide consulting services in the field of security in companies, organizations and individuals.”

Source: company website · checked Sep 5, 2026
12
Accessit LTDIndirect evidence
Athens, GreeceHQ checked Sep 5, 202611-508

“Accessit is a dynamically developing company that provides integrated solutions in the field of Internet.”

Source: company website · checked Sep 5, 2026
13Cholargos - Athens, GreeceHQ checked Sep 5, 202611-507

“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: company website · checked Sep 5, 2026
14
Cysoft LTDIndirect evidence
Nea Smyrni, GreeceHQ checked Sep 5, 20261-107

“Η Cysoft Σύμβουλοι Πληροφορικής ΕΠΕ ιδρύθηκε το 1998 για να διαθέσει στην Ελληνική Αγορά επιλεγμένα προϊόντα και λύσεις ασφάλειας πληροφορικής.”

Source: company website · checked Sep 5, 2026
15
LogisekPartial evidence
Koropi, GreeceHQ checked Sep 5, 202611-506

“Logisek is a leading Cyber Security and IT services firm, founded in Greece in 2008 and expanded to Romania in 2019.”

Source: company website · checked Sep 5, 2026
16
PES CybersecurityIndirect evidence
GreeceHQ checked Sep 5, 20261-106

“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: company website · checked Sep 5, 2026
17
HeadnetPartial evidence
Athens, GreeceHQ checked Sep 5, 20261-106

“At HEADNET, we deliver advanced networking and cybersecurity solutions designed to meet your unique business needs.”

Source: company website · checked Sep 5, 2026
18
I-MetrixPartial evidence
Athens, GreeceHQ checked Sep 5, 202611-505

“Started in is now one of the leading companies in managed security services.”

Source: company website · checked Sep 5, 2026
19
Cyberone S.APartial evidence
Chalandri, GreeceHQ checked Sep 5, 20261-104

“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: company website · checked Sep 5, 2026
20
Snsfortech S.AIndirect evidence
Chalandri, GreeceHQ checked Sep 5, 202611-504
Source: company website · checked Sep 5, 2026
21
Fsociety S.M. P.CIndirect evidence
Pireas, GreeceHQ checked Sep 5, 20261-104

“f society was founded in 2017 in Greece during the economic crisis, breaking the brain drain rule.”

Source: company website · checked Sep 5, 2026
22
Raven CybersecurityPartial evidence
Heraklion, GreeceHQ checked Sep 5, 20261-103

“Raven Cyber Security is a startup specializing in cybersecurity services, including penetration testing, production of cyber security learning courses, and software development.”

Source: company website · checked Sep 5, 2026
23
NetacmionStrong evidence
Athens, GreeceHQ checked Sep 5, 20261-103

“Netacmion is a business firm that provides network infrastructure, security, and managed services for commercial and government clients of all sizes.”

Source: company website · checked Sep 5, 2026
24
FractisPartial evidence
Athens, GreeceHQ checked Sep 5, 20261-102

“We are a cyber security firm based in Greece operating in the EMEA region.”

Source: company website · checked Sep 5, 2026
25
Nisos AdvisorsIndirect evidence
Amaroúsion, GreeceHQ checked Sep 5, 202611-502

“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: company website · checked Sep 5, 2026

Showing 25 of 65 network security consulting firms based in Greece

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Network security consulting firms based in Greece at a glance

As of Sep 5, 2026
1-10Median size (employees)
AthensLargest hub · 26 HQs
23Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
42
11-50
18
51-200
4
501-1,000
1

Verified emails by last verification

0–30
263
31–60
12
61–90
0
90–180
0
180+
1

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 network security consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in Greece whose own description of what they do matches “network security consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among network 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 an evidence 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, 276 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 5, 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.

Network security consulting firms by metro

  • Network security consulting firms in Athens26

Frequently asked

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

RevenueBase identified 65 network 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?

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

Which city has the most network security consulting firms?

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 276 verified decision-maker contacts tracked across these 65 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 5, 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 SmartSearch, 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.