Company lists · Data refreshed September 2026
Top 24 Information security companies based in Greece
RevenueBase identified 70 information security companies headquartered in Greece as of September 2026 and tracks 1,359 professional contacts across them, including 652 with verified work emails and 25 with mobile numbers. Athens is the largest hub.
This list covers information security 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 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.
The 24 largest information security companies based in Greece
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 184 | ||||
“CENSUS is a cybersecurity engineering powerhouse.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 2 | 157 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 3 | 25 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 4 | 20 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 5 | 19 | ||||
“With constant integration of technology in every aspect of an organisation, information security is something that everyone needs.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 6 | 17 | ||||
“100+ years of combined experience.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 7 | 17 | ||||
“Alphabit is an expert Cybersecurity services provider.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 8 | 13 | ||||
“Η XGate προσφέρει ένα σύνολο υπηρεσιών ολιστικού ελέγχου ασφάλειας πληροφοριακών συστημάτων, που δεν στηρίζεται μόνο σε έτοιμα, γνωστά, αυτοματοποιημένα μοντέλα, αλλά κυρίως σε…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 9 | 12 | ||||
“CyberNoesis was established in 2015 by cyber security specialists with extensive experience in enterprise, industrial and telecommunications sectors.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 10 | 12 | ||||
“GeniusNet SA is a High tech Cybersecurity and Smart security Company specialized on Supporting your business!” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 11 | 11 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 12 | 9 | ||||
“Accessit is a dynamically developing company that provides integrated solutions in the field of Internet.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 13 | 7 | ||||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 | ||||
“ICT PROTECT is an information security firm, specialising in Security Management and Security Training services.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 15 | 7 | ||||
“Established in 2024, TÜV AUSTRIA Trust IT stands as a subsidiary of TÜV AUSTRIA, specializing in comprehensive information security and IT-related services.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 16 | 7 | ||||
“InnoSec is a spin-off company, involved in state-of-the-art research in the field of information security.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 17 | 7 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 18 | 6 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 19 | PES CybersecurityIndirect evidence | 6 | |||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 20 | 6 | ||||
“At HEADNET, we deliver advanced networking and cybersecurity solutions designed to meet your unique business needs.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 21 | 5 | ||||
“Started in is now one of the leading companies in managed security services.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 22 | 4 | ||||
“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 3, 2026Thanks. The Data Team will review it. | |||||
| 23 | 4 | ||||
“Privately held company providing cyber-security services, specializing in Digital Forensics / Incident Response (DFIR), malware analysis.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 24 | 4 | ||||
Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
Showing 24 of 70 information security companies based in Greece
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 652 reachable decision-makers.
Free signup · no credit card
Information security companies based in Greece at a glance
As of Sep 3, 2026Companies by employee count
Verified emails by last verification
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 information security companies, 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 “information security companies”. 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 information security 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 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, 652 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 3, 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.
Information security companies by metro
- Information security companies in Athens29
Frequently asked
How many information security companies are there based in Greece?
RevenueBase identified 70 information security 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?
Census, headquartered in Thermi Thessaloniki, tops this list with the largest team on record.
Which city has the most information security companies?
Athens leads with 29 headquartered companies, followed by Attica (2) and Heraklion (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 652 verified decision-maker contacts tracked across these 70 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 3, 2026.
Ready to reach these companies? Verified emails and direct dials for all 70 information security companies based in Greece. Start with a free account, no credit card.
Get the full listRelated lists
Information security companies by geography
- Information security companies based in the United States
- Information security companies based in the United Kingdom
- Information security companies based in Brazil
- Information security companies based in Canada
- Information security companies based in France
- Information security companies based in Australia
- Information security companies based in Germany
- Information security companies based in Spain
- Information security companies based in the Netherlands
- Information security companies based in Italy
- Information security companies based in Mexico
- Information security companies based in South Africa
Browse the directory
Browse: Companies home · All Greece lists · All Information security companies lists · New lists
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Information security companies based in the United States
- Information security companies based in the United Kingdom
- Information security companies based in Brazil
- Information security companies based in Canada
- Information security companies based in France
- Information security companies based in Australia