Company lists · Data verified August 2026

Top 25 Cybersecurity defense companies based in Romania

Name: Cybersecurity defense companies based in Romania
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 66 companies tracked

There are 66 cybersecurity defense companies headquartered in Romania (RevenueBase, August 2026). RevenueBase tracks 472 professional contacts across them, including 184 with verified work emails and 11 with mobile numbers. Bucharest is the largest hub.

This list covers cybersecurity defense companies headquartered in Romania, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

66Companies

472Contacts tracked

184Verified emails

11Mobile numbers

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The 25 largest cybersecurity defense companies based in Romania

Ranked by team size

Top 25 of 66 cybersecurity defense companies based in Romania, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Revelsi	Bucharest	51-200	66	24
2	Safetech Innovations	Bucharest	51-200	53	42
3	Cybergen	Bucharest	51-200	50	7
4	Data Core Systems, Romania	n/a	11-50	43	27
5	Cyber Threat Defense	Cluj-Napoca	51-200	34	14
6	BIT Sentinel	Bucharest	11-50	24	16
7	Fort Cyber	Bucharest	11-50	24	15
8	Cybourn	Bucharest Bucharest	51-200	17	8
9	Global Data	Bucharest	1-10	13	1
10	Cyber Smart Defence	Bucharest	11-50	11	2
11	D3 Cyber	Cluj-Napoca	1-10	8	5
12	Zamolxis	Bucharest	11-50	7	1
13	Axyome	Craiova	1-10	6	1
14	Dotdna	Bucharest	11-50	5	5
15	Blackshell	Bucharest	11-50	5	3
16	Cybrops	Bucharest	11-50	5	2
17	Espace IT	Cluj Napoca	1-10	4	2
18	Best Internet Security Biss	n/a	11-50	4	1
19	Eset Romania	Bucharest	11-50	3	2
20	Netrunners	Bucharest	11-50	2	1
21	Risktronics	n/a	1-10	2	1
22	Relax IT	Bucharest	11-50	1	1
23	Sectio Aurea	n/a	11-50	1	1
24	TLN Computer	Brasov	1-10	1	1
25	Panthero	Satu Mare	1-10	1	1

Showing 25 of 66 cybersecurity defense companies based in Romania

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Cybersecurity defense companies based in Romania at a glance

As of Aug 28, 2026

1-10Median size (employees)

BucharestLargest hub · 32 HQs

11Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

Cybersecurity defense companies by metro

Metro	Companies
Cybersecurity defense companies in Bucharest	32
Cybersecurity defense companies in Cluj-Napoca	4
Cybersecurity defense companies in Bucuresti	4
Cybersecurity defense companies in Bucharest Bucharest	2
Cybersecurity defense companies in Timisoara	2
Cybersecurity defense companies in Craiova	2
Cybersecurity defense companies in Suceava	1

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity defense companies”, with match quality audited by blind human judging, and headquartered in Romania.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cybersecurity defense companies are there based in Romania?

There are 66 cybersecurity defense companies headquartered in Romania as of August 2026 (RevenueBase).

What is the largest company on this list?

Revelsi, headquartered in Bucharest, tops this list with the largest team on record.

Which city has the most cybersecurity defense companies?

Bucharest leads with 32 headquartered companies, followed by Cluj-Napoca (4) and Bucuresti (4).

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 184 verified decision-maker contacts tracked across these 66 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.